(Or the engine isn't pulling enough vacuum to open the secondaries. Welcome to The Outdoors Trader! Join today, registration is easy! You can register using your Google, Facebook, or Twitter account, just click here. Saying that using the 1/2 idle vacuum rule/use in a 6. many people have the misconception that opening the secondary throttle plates sooner will provide increased performance in quicker dragstrip times others think they must feel a kick when the secondaries engage still others believe that they should disconnect the vacuum diaphragm and make the secondaries open mechanically let's discuss these points in reverse order first you should. the of opening the secondary throttlc Most four-barrel carburetors me- linkage to the This that the primaries must a certain degree Of opening the begin to open. We'll show you how to do it on both vacuum secondary and double pumper models. It stumbles off the line and i have recently rebuilt it and it still is doin this. Shop with confidence. On a different Holley carb, I can manually open the secondaries, and they slowly return to a closed position. 780---> Side view of secondary vacuum linkage/manual choke if equipped as on the 3310. Follow this simple test to see if your secondaries are opening under a load. The Off-Road Truck Avenger is designed specifically for off-road applications. The solenoid is open all the time and is controlled by a micro switch so when you get to 3/4 throttle it closes. To set your dissy is simple. eta- 8" of vacuum from what I know isn't a whole lot at idle, it's supposed to be a lot more. But like the Q-jet and Edelbrock/Carter carbs, the vacuum secondary Holley is also self-regulating. Holley makes a. This 4160 style carburetor has vacuum secondaries, single fuel inlet, and electric choke. Apart from improving street drivability, it is often possible to use a vacuum secondary carb of about 50 cfm more than with a mechanical secondary. See our Performer Series Carburetor. When setting idle speed, the butterfly openings should be adjusted equally both primary and secondary side. Which, I take it, that the secondary's are not opening, Ford 4100 secondaries are vacuum-operated via a diaphragm. I do not get the loud moan under full throttle conditions even with the air cleaner removed. It's stock out of the box, the cam has. 7) Check idle solenoid, especially for power/ground, replace solenoid if necessary. Additional parts may be required. Like is used on Chevy inline 6 intakes. (That's the rod that comes out the bottom of the secondary diaphragm housing) That will open the secondaries, and the engine will rev higher. I beg to differ, unless Sportive is free winding the motor to the moon he should not be getting enough of a vac. Looking at the vacuum operator, it draws a vacuum signal from the venturi of the secondary. What there is, is a venturi (passage) from the primary fuel bowl to the vacuum diaphram and as air flows through the primary throttle bore it creats a vacuum in that venturi that open the secondary. Hi all, I just bolted on a 650 Vac Sec. linkage and if they are not opening there is a linkage problem. Likewise, a stiffer spring will delay the secondary opening. Engine vacuum with big cam. In this session, we decided to tackle how to adjust and tune secondary opening rate for a vacuum-operated Holley. Try a light (pink) spring in the vac secondary and it opens quicker - not as quick as a DP though. A 600 CFM converts to 450CFM Good for 250 A 750CFM converts to 562CFM Good for Hot 250 and 292. The vacuum secondaries are controlled by a diaphragm and a color coded spring. If your secondarys open without the pump shot, you have a big vacuum leak and the engine falls on it's face. They use a large diaphragm mounted to the side of the main body to open the rear barrels by sensing airflow through a bleed feeding into the primary venturi—assisted in some cases by another airflow-sensing feed on. Car will not start without starting fluid, seems flooded out, then when it starts, the leaks stop. Compensate for all weights to allow smooth opening of secondaries. WTF!! WAS running great until this morning. The only way to tell if they're opening or not is to have someone watch the linkage as you're running on the lake. I'd start with idle screws turned out 1 1/2 turns, that should let it run at least. I had my wife push the accelerator to the floor and the linkage does not move the secondary butterfly at all. While all the Holley carbs being discussed are all four-barrel carbs, they don't all operate all the same way. the secondaries open up and provide the mid- and. The location of the transfer ports in the secondaries is different than in the primaries, so the bottom of the secondary transfer ports may not be visible. If yours does have it,check for loose linkage,out of adjustment. The two primaries on those carbs would get you about 540cfm so it should want to open the secondaries a little bit but probably not too far. Finally put the car on a chassis dyno and actually confirmed one opened by not the other. The secondaries still won't open. Remove the existing carburetor by the following procedure: A. Adjust the idle so it's around 1500rpm. So as a temporary fix I zip tied the linkage to bypass the vacuum. Holley on my 308. Edit: Do not attempt to make your vac carb mechanical. Had Holley do mine sent it right back to factory. You have two questions: one about ignition timing and advance, the other about carb operation. Hi, I can not get secondaries to open on my Holley 4160 750 vacuum secondaries. linkage and if they are not opening there is a linkage problem. Provides springs of various rates to allow the racer to custom tailor the vacuum secondary opening and closing rate to best suit their combination Contains seven springs color coded from light to heavy Instructions included *Not legal for sale or. The goal in designing the Street Warrior was to take all of those years of experience and build the ultimate performance street carburetor for your daily driver that would not break the bank. Saying that using the 1/2 idle vacuum rule/use in a 6. The engine feels like it has little to no difference in power at cruise (primary open, secondary closed) once I open the secondary it comes alive. Again, the Q-jet has a power piston spring that sets the rod in the jet linearly depending on engine vacuum - much more sophisticated then the power valve. I think the question is are the secondaries capable of opening all the way. I shut the motor off, closed the secondaries, re-start and all is well until the next WOT. If it has full vacuum advance, use the driver side vacuum port. This second orifice becomes active when the secondaries begin to open creating vacuum in the secondary venturi. Dual feed fuel inlets for constant high volume fuel delivery; Compatible with GM, Chrysler, and Ford A/T kickdown linkage. Model 4160 carburetors are almost always vacuum secondary designs, but manifold vacuum does not actuate the vacuum secondaries. Was guided to the 20-28 replacement covers to equalize the vacuum between the two housings - now neither open. Parts are just part of what we do. Follow along with these Holley carb mods, and we'll make a tuner out of you. (bigger jets, fixed the gas leak. signal from one of the primary venturis to open the secondary's, according to the holley book they usually won't open unless under a load, if Sport has a double pumper they he should have mech. Notice: Undefined index: HTTP_REFERER in /home/rongbienkfood. How to Tune a Holley (basic) by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. even if they are not needed Vacuum operation of the secondary throttles relates their opening point more closely to the. Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries. Vacuum Secondary Carbs are a good choice for street cars. ADJUSTING THE OPENING POINT OF VACUUM SECONDARIES There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. I guess I will start with the 2. Not quite closed but also not very open. Realized that the secondaries weren't opening. Vacuum secondary Holleys are easy to identify because of the large diaphragm. Again, the Q-jet has a power piston spring that sets the rod in the jet linearly depending on engine vacuum – much more sophisticated then the power valve. The lighter springs in this kit can open the secondary. I briefly made mention to a LIST-6947, D5TE-9510-EA Holley/Ford vacuum secondary 4-barrel above, that could be the beginnings for a blow-thru application, but now see and realize since disassembling it, that it's got the same design features as other under-carbureted Ford carburetor scenarios of a too small carburetor on large workhorse engines. Sounds like we have (I had) the same project. There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. Some basic questions: 1. The engine needs to be under a load before they will open. Single feed fuel inlet for easy installation; Compatible with GM, Chrysler, and Ford A/T kickdown linkage. We offer a variety of Holley Vacuum Secondary for your automotive needs. My problem is the secondaries are not opening up like they should, maybe not at all. They could seem like they’re spreading cheer, however holiday e-cards may pack a hidden punch. When it was done I had a balanced and blueprinted motor with new pistons, completely rebuilt heads with new larger valves (781 heads), Comp hydrau. Compensate for all weights to allow smooth opening of secondaries. Realized that the secondaries weren't opening. (That's the rod that comes out the bottom of the secondary diaphragm housing) That will open the secondaries, and the engine will rev higher. Holley, Street Avenger Carb, 770 cfm, Electric Choke Designed specifically for the street enthusiast. Double springs? 08-08-06 08:08 AM - Post# 982332 In response to Blaine that "BOG/STUMBLE" is a much more likely result of a classic case of an acellerator pump shot voluume thats either not large enought (not enought CCs of gas) resulting in a gulp of leaner than ideal air in the manifold, or one thats not lasting long enought,(begins too late or ends to. For some reason the bigger (670 cfm) carburetor works well with a softer vacuum capsule spring. I put the carb on the car, started fine, idles fine, runs at any speed as long as I didn't get on it too hard. As the secondaries open, there is an additional vacuum signal that comes from the secondary venturis to enhance the vacuum from the primaries. The secondaries are staying cracked open a bit. I have a 1985 Ford F-250 4x4 w/ a 460 and a Holley 4180C 4-barrel carb on top. Q- Series Carburetor 850 CFM BLOWER GAS DRAG RACE CARBS- Built for the ultimate blend in performance and drive-ability. It also means that the will open at that point. Vacuum secondaries for use on wide variety of vehicles. put the vac diaphragm assembly back onto the carb with a new cork gasket for the vacuum passage, and the vac secondaries still don't open AT ALL. double pumper or vaccum secondary. vn/public_html/tyup08h/nm1. Actuallly, I did experience a stroker big block running vacum secondaries this past summer. Vacuum Secondary Carbs are a good choice for street cars. Too much spring pressure and your secondaries loaf or do not open at all. Refrain from the old small bolt in the linkage trick to manualy open them, cuz the vacuum design will not add power but rob power. here is a 4160 Holley carburetor numbers on front air horn are list-3310-3 then below those numbers-2279-which looked up on the holley i. The orifice in the primaries is assisted by another orifice in the secondary venturi. My neighbour spotted that the vac secondaries are not opening. Nozzles, plastic cams, vacuum secondary springs. anyhow, the guys on that forum basically said it was no good and could cause the secondaries not to work. The vacuum secondaries are controlled by a diaphragm and a color coded spring. Re: Holley 4 Barrel, Carb Secondaries Not Opening You have a vac secondary 600, you'll never get the secondaries to open without a load, even running at the dock in N revving it. All you’ll need is a screwdriver and a good vacuum gauge. I'm wondering about the same thing (408 stroker for street use), and I initially assumed vacuum secondaries for street use - however, my brother and buddies that also run street cars swear by mechanical secondaries. I used the paper clip on the linkage and it didn't move. Ported vacuum is vacuum that is present only after the throttle blades are open slightly. NEVER xxx NEVER open the secondary's for more air as it also brings in more fuel. after I tighten them up no leaks , this is poor quality workmanship on holly's part ( not jeg's. Find Holley Carburetors with 600 CFM and get Free Shipping on Orders Over $99 at Summit Racing! Soon you will not be able to create a secure connection to our web. Classic Industries offers a wide selection of 1972 Chevrolet Truck parts, including 1972 Chevrolet Truck interior parts and soft trim, 1972 Chevrolet Truck exterior sheet metal, 1972 Chevrolet Truck moldings, 1972 Chevrolet Truck emblems, 1972 Chevrolet Truck weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. Home > • Carburetor Parts & Accessories > Holley Carburetor Parts > Vacuum Secondary Parts > BIG- 10258 Holley 4150 & 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart Price Your Price: $16. Adjust the Opening Point of Vacuum Secondaries The opening rate of a vacuum secondary system is controlled by the diaphragm spring located in the vacuum secondary diaphragm housing. Go to a one size weaker spring in the vacuum diaphragm to open the secondaries quicker. On my '71 quench head M-code the vacuum secondaries open around 2500 RPM, If Needed. Actuallly, I did experience a stroker big block running vacum secondaries this past summer. A "lighter" spring will allow the secondary throttle plates to open more quickly. How to Select the Right Holley Carburetor for Your Car it's simply easier to go with one that's equipped with a vacuum secondary system; the secondaries open. are more for AT ? Videos show you could by a small supply store of parts to tune. Not finding what you're looking for? Save holley vacuum secondary cover to get e-mail alerts and updates on your eBay Feed. This second orifice becomes active when the secondaries begin to open creating vacuum in the secondary venturi. As a last resort I have taken out the spring and am running with no spring which works in getting the secondaries open but I know this is not how the carburator was intended to operate. Vacuum Secondaries. Always had Holley carbs but purchased Edelbrock Performer and was puzzled why on test stand (351c)(my 1970 Mach 1) secondaries did not open - apparently the answer is that choke must be fully open AND throttle position at least 65% open - which does not happen on test stand as engine will hit maximum RPM before 65% throttle - so need dyno or to. Vacuum secondary carburetors use a vacuum diagphragm to open using engine vacuum signals to let the engine "tell" the carburetor it needs more fuel under acceleration. I have the quick change tops on the vacuum secondary diaphragm housings for both carbs, and they are linked together with a vacuum hose. Finally put the car on a chassis dyno and actually confirmed one opened by not the other. Gold Dichromate finish for corrosion resistance and classic Holley looks Vacuum secondaries for use on wide variety of boats. WARNING: Carefully protect the open end of the fuel lines, so that no foreign particles can enter. Not quite closed but also not very open. Search: Search. Apart from improving street drivability, it is often possible to use a vacuum secondary carb of about 50 cfm more than with a mechanical secondary. You do not have the ability to run a secondary accellerator pump, this will cause a giant bog. Gerard > > At a yard sale, for five bux heh heh heh, I picked up a marine 4150 vacuum > secondary *850* CFM Holley. Holley Carb Vacuum Secondaries NOT Opening? - 5 MIN Tested/Explained/Repaired ThunderHead289. engines & 2 x 4 streettunnel ram set-ups - Factory preset electric choke for easy startups - Vacuum secondaries for use on wide variety of vehicles. The previous owner had it jetted very rich but it still bogged like it had a bad accelerator pump. ADJUSTING THE OPENING POINT OF VACUUM SECONDARIES There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. You can "manually" test your secondaries, but you'd be doing it "mechanically", not by vacuum. the secondaries open as expected. WARNING: Carefully protect the open end of the fuel lines, so that no foreign particles can enter. You can't! Vacuum secondary carburetors have vacuum passages built into the body of the carb to provide vacuum to the secondary diaphragm, which operates the secondary’s when there is enough airflow going through the primaries. Race carbs like the holley HP series do not have a vac advance port. All 4150's have dual accelerator pumps, and dual fuel inlets hence the term "double pumper. Holley Vacuum Secondaries Not Opening On Dual Quad Setup The primary is an 1850 600 cfm, and the secondary is an 8007 390 cfm. A vacuum secondary carb means the secondary. The carburetor has several external ports and inlets. Finally put the car on a chassis dyno and actually confirmed one opened by not the other. If not, replace the unit. It's stock out of the box, the cam has. the of opening the secondary throttlc Most four-barrel carburetors me- linkage to the This that the primaries must a certain degree Of opening the begin to open. Looking at the vacuum operator, it draws a vacuum signal from the venturi of the secondary. Remove secondary vacuum diaphragm housing. If you have the plugs out, check the compression and see what you have to work with before spending a lot of money. To eliminate this problem, you can adjust the secondary opening screw to allow the secondary throttle plates to be cracked open a little more than the spec requirement. By playing with various secondary springs, you can tailor the secondary opening point and rate of your carb, and can even make them to where they don't open all the way. It should not be necessary to dismantle the metering blocks any further because the tubes inside the main and idling walls can be easily cleaned out using compressed air. Parts are just part of what we do. It idles fine but when I drive it, it won't build up any revs or it dies. The goal in designing the Street Warrior was to take all of those years of experience and build the ultimate performance street carburetor for your daily driver that would not break the bank. My white '74L came with a model 3310S Holley 750 vacuum secondary carb. HOLLEY 4160 CARBURETOR 4 Barrel 600 CFM Vacuum Secondaries 0-1850s - $269. This quick walk-through will get your Holley carb up and running with a perfect idle in no time. Carefully disconnect the fuel line. Now I also think that the vacuum circuit gets some restriction from this ball. , check the vacuum opening operation as follows: (a) On externally mounted vacuum diaphragm unit, connect a piece of hose to fitting on the vacuum diaphragm unit and apply suction preferably ∫y hand vacuum pump or another vehicle. Wrap the end of the fuel line with a clean lint-free cloth. is a 750 double pump holley carb better then a holley750 vaccum secondary carb?? i have a 67 camaro, stock weight, with a 383 stroker, mildly street built. Gerard > > At a yard sale, for five bux heh heh heh, I picked up a marine 4150 vacuum > secondary *850* CFM Holley. The vacuum secondary should be held partly open at idle by a small lever that rests against an insignificant looking adjustment screw on the bottom of carburetor body just below the vacuum diaphragm body. so i kept putting lighter and lighter springs in until the lightest one they make was in, and even now, only. (bigger jets, fixed the gas leak. It didn't boost performance of the motor by 50 HP, but then it's a. DO NOT gouge the intake manifold sealing surface during removal of old gasket material. 1) Big vacuum leak somewhere. I briefly made mention to a LIST-6947, D5TE-9510-EA Holley/Ford vacuum secondary 4-barrel above, that could be the beginnings for a blow-thru application, but now see and realize since disassembling it, that it's got the same design features as other under-carbureted Ford carburetor scenarios of a too small carburetor on large workhorse engines. I have a 1977 20 foot Cuddy with the standard 302 PCM motor. While all the Holley carbs being discussed are all four-barrel carbs, they don’t all operate all the same way. Locate the secondary actuation rod, and push up on it. intake, 800cfm DP Holley, 1-5/8" headers "Anytime an open header or. Holley Carburetor 390 CFM Electric Choke, Vacuum Secondaries. Vacuum secondaries come into play as you lean on the throttle under hard acceleration. Save on Holley Vacuum Secondary Diaphragm 135-4 at Advance Auto Parts. Spring reference that is included is not from Holley, and provides backwards RPM range opening and full open. Single feed fuel inlet for easy installation 100% wet-flow tested by Holley technicians to assure it arrives ready to run! Please click here to ask a question. It's stock out of the box, the cam has. Holley Carburetor: Idle and Transition Circuit Calibration Guide July 27, 2015 by Muscle Car DiY At the risk of sounding repetitive, let me say once again, that if you bought an application-specific carb, you probably are only going to need to do minimal adjustments to mixture calibration. The trick here is to size the power valve roughly 1. The secondaries, on a 4160 carb, are opened by a vacuum signal from the primaries, when there is enough vacuum generated by airflow through the primary venturis to pull up on the secondary diaphragm. I ran twin 450 Holleys on ours, at 5200 and about 400hp, it would open both secondaries about 2/3 of the way open, so I figure it was using about 750cfm worth of throttle plate. Talked with Holley, they stated the 2. Modifying the Holley Teapot four barrel carb for late model distributors March 2, 2013 Ted Eaton The Holley model 4000 four barrel carburetor that came as original equipment on single four barrel equipped 1956 and earlier Fords, Mercurys, and Lincolns is not up to its full potential when used with the '57 and up Y-Block distributors. jetted in the 70's but not 100% sure without opening up The K&N air filter element I also have for sale would be the perfect companion. Because Holley chose to implement the ported vacuum on the secondaries (instead of the primaries) this progressive link is likely going to put the vacuum advance at a point where it is ineffective. Springs themselves look ok. Plunger should move inward and hold vacuum. Probably not enough for most vac cans. Compensate for all weights to allow smooth opening of secondaries. Holley makes about 4 different diaphragms. Re: holley carb not opening completely @ wot That Holley has vacuum secondaries, so either the vacuum pot isn't getting vacuum, the diaphragm is ruptured or the spring is to heavy. The vacuum secondaries operate off of incoming air flow, not any vacuum line. By pointing recipients to select embedded links, they are able to funnel them to scam sites. You got your foot in it, right? For reliability, a plug and an increase in jet size to compensate is a good thing to do, as Big Al suggests. There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. Wrap the end of the fuel line with a clean lint-free cloth. Was guided to the 20-28 replacement covers to equalize the vacuum between the two housings - now neither open. Home > • Carburetor Parts & Accessories > Holley Carburetor Parts > Vacuum Secondary Parts > BIG- 10258 Holley 4150 & 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart Price Your Price: $16. This ensures the secondaries will open fully on most applications. WTF!! WAS running great until this morning. Plunger should move inward and hold vacuum. This quick walk-through will get your Holley carb up and running with a perfect idle in no time. I only had to remove the choke once to install this, and after that it was just pop off the air filter, pull off the two easy to get to screws, and. 5-inches below the minimum amount of vacuum your engine produces at idle. custom cam (TBD), Victor Jr. I purchased the engine as a rebuilt unit that had not been fired yet. here is a 4160 Holley carburetor numbers on front air horn are list-3310-3 then below those numbers-2279-which looked up on the holley i. I have not used a vacuum secondary carburetor on a 300 six because it responds well to mechanical secondaries without a hint of bog. Secondary Vacuum. Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries. That may be the best solution, I assume the pickup bleed in the secondary venturi is open. What there is, is a venturi (passage) from the primary fuel bowl to the vacuum diaphram and as air flows through the primary throttle bore it creats a vacuum in that venturi that open the secondary. Holley's Model 4160 four barrel carburetors are designed for budget minded enthusiasts and are calibrated for use on stock to mildly modified engines. This quite often occurs again when the carb is too big for the displacement, vacuum signal, or compression ratio, and the only real crutch for this is to adjust the secondary butterflies stops a bit open to get more air, to allow closure of the primary butterflies sufficiently to cover the transition slot which will help make the idle mixture. Not all Holly's have mechanical secondaries. With the vacuum-secondaries, diaphragm springs are used to control opening speeds. Vacuum secondaries for use on wide variety of vehicles. That carb has vac secondarys. There is. How does one tell if the secondaries are opening?. Under power operation, it is supple­mented by the power system. A lighter spring will allow the secondary throttle plates to open more quickly. Jets for the Holley carb are readily available from Holley at most speed shops. Note the cork gasket, if this isn't installed then the secondaries will not open & you will have a vacuum leak. Problem CONDITION POSSIBLE CAUSE CORRECTION 7) Idle cut-off solenoid not working. There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. RaGG-exactly when does the problem occur? At a. We’ll take you through the entire process in the slide show below:. ) don't start to open the secondaries until 40-45 degrees of primary throttle opening. If you would like your secondaries to come in a. Keeping your accelerator pump system working at its best is critical to achieve the correct fuel discharge and performance. Vacuum secondary carbs demand sufficient air velocity through the secondary side as the throttle begins to open in order to stimulate fuel flow from the secondary boosters to prevent hesitation. Holley 20-59 - Holley Vacuum Secondary Carburetor Accessories Once you get the vent point moved to the center of the bowl (instead of the back wall) you don't get NEARLY as much flooding from the front bowl when going UP hill, Get the opening of the vents up off the Venturi body and the fuel can't spill into the Venturis like it did before. If it has Vacuum secondaries Holley makes different springs to open them sooner. If you have adjusted the secondary already or by mistake then try to get it back to as close to being closed as possible. Holley on my 308. Compensate for all weights to allow smooth opening of secondaries. Holley makes a number of different springs with different tension on the springs. To be used with a OPEN plenum intake design. That carb has vac secondarys. Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries. Am I just over-carbed?. Shop with confidence. Remove the existing carburetor by the following procedure: A. This one looks. I do not get the loud moan under full throttle conditions even with the air cleaner removed. With the engine off and cold the choke actuates a lever which holds the secondaries closed so be aware that unless you manually open this first then actuating the throttle by hand will not open the secondaries. 5 PV is because a boat is always under load. Compensate for all vehicle weights, gearing & transmissions to allow smooth opening of secondaries. Engine vacuum with big cam. Fuel Injection, Carburetion & Fuel System - Secondaries Won't Open on Holley - I put a new Holley 600, vacuum secondaries, on my Windsor a few days ago and I got it running good. Being a 4160, it doesn't allow for changing jets on the secondary side so I purchased a conversion kit and pulled the carb off. Secondary adjustment is set with a screw accessible from the underside of the carburetor. The motor will not idle down. Problem CONDITION POSSIBLE CAUSE CORRECTION 7) Idle cut-off solenoid not working. Edit: Do not attempt to make your vac carb mechanical. Go to a one size weaker spring in the vacuum diaphragm to open the secondaries quicker. put the vac diaphragm assembly back onto the carb with a new cork gasket for the vacuum passage, and the vac secondaries still don't open AT ALL. Home > • Carburetor Parts & Accessories > Holley Carburetor Parts > Vacuum Secondary Parts > BIG- 10258 Holley 4150 & 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart Price Your Price: $16. " The difference between vacuum and mechanical secondaries is simply in how the carb actuates the secondary metering system. Modifying the Holley Teapot four barrel carb for late model distributors March 2, 2013 Ted Eaton The Holley model 4000 four barrel carburetor that came as original equipment on single four barrel equipped 1956 and earlier Fords, Mercurys, and Lincolns is not up to its full potential when used with the '57 and up Y-Block distributors. How to Tune a Holley (basic) by Lars Grimsrud SVE Automotive Restoration Musclecar, Collector & Exotic Auto Repair & Restoration Broomfield, CO Rev. 4150 means it has metering block on the secondary side as well. 040" exposed (viewed with the carburetor removed from the engine and turned upside down). If you would like your secondaries to come in a. Find Holley Carburetors with 600 CFM and get Free Shipping on Orders Over $99 at Summit Racing! Soon you will not be able to create a secure connection to our web. However, the transfer slot should not have more 0. The secondary jetting can now be easily tuned using the same jets for both primary and secondary. DO NOT gouge the intake manifold sealing surface during removal of old gasket material. In this session, we decided to tackle how to adjust and tune secondary opening rate for a vacuum-operated Holley. Overview Holley carbs have been used by hot. To be used with a OPEN plenum intake design. 4160 carb was rebuilt with new vacuum diaphram. The spring adjustment is the most known and it's easily. Mechanical secondaries are linked directly to the accelerator pedal and can get poorer fuel mileage than a carburetor with vacuum-secondaries. How will the secondary ever open?. tbarb wrote: I wonder how a 600 Holley vacuum secondary carburetor would act. Re: holley carb not opening completely @ wot That Holley has vacuum secondaries, so either the vacuum pot isn't getting vacuum, the diaphragm is ruptured or the spring is to heavy. On my '71 quench head M-code the vacuum secondaries open around 2500 RPM, If Needed. The vacuum secondary should be held partly open at idle by a small lever that rests against an insignificant looking adjustment screw on the bottom of carburetor body just below the vacuum diaphragm body. Why it wants to race kinda says it's getting gas from somewhere until it uses it up and shuts down. Most Holley carbs are fitted with no power valve in the secondary metering block. But like the Q-jet and Edelbrock/Carter carbs, the vacuum secondary Holley is also self-regulating. However, some carburetors may be fitted with a secondary power valve which can be used if additional fuel is demanded on the secondary side. Note the cork gasket, if this isn't installed then the secondaries will not open & you will have a vacuum leak. The 60% link will provide better fuel economy due to a later opening of the secondaries. Holley 4BBL Vacuum Secondary 750CFM Description: SMI - STAGE TWO - 3310 (750 CFM) 4160 HOLLEY FOUR BARREL: Our Price: $595. I think the question is are the secondaries capable of opening all the way. At this point, the secondaries begin to open. Race carbs like the holley HP series do not have a vac advance port. Bowls come equipped with 3/8in inverted flare fuel inlet fittings and will accept all conventional dual feed fuel lines compatible with Holley four barrel carburetors. Only problem is vacuum secondaries are NOT opening. It does not open the secondary at all. The other question is throttle opening and when the secondaries are beginning to open. Home > • Carburetor Parts & Accessories > Holley Carburetor Parts > Vacuum Secondary Parts > BIG- 10258 Holley 4150 & 4160 Vacuum Secondary Adjustable Spring Kit & Open Chart Price Your Price: $16. If your distributor uses timed vacuum advance, connect its vacuum hose to the passenger side vacuum port. I need some advice on what to look for. Follow this simple test to see if your secondaries are opening under a load. I used to get 300+ HP from a 351C with a torque cam and 600 cfm Holley vacuum secondary carb, yet get 19-20 mpg in the highways. I may well move to a 650 DP. Simple removal but be sure to put gasket between intake and carb on right. The two primaries on those carbs would get you about 540cfm so it should want to open the secondaries a little bit but probably not too far. ADJUSTING THE OPENING POINT OF VACUUM SECONDARIES There are a number of ways to tune the moment when the vacuum secondaries open on a Holley four barrel carb. If yours does have it,check for loose linkage,out of adjustment. There are two modes of operation for mechanical secondaries: progressive -- the secondary shaft only starts to open after the primary shaft has opened to 40-45º. 500 lift on both valves and the lobe seperation angle is 114 degrees. Holley carburetors feature idle mixture screws which control the air/fuel ratio and these are usually the main culprits in an improperly idling carb. - Integrated 700R4/200R4 transmission kick down cable mounting. It's whether it has a metering jet versus metering plate on the secondary side. Very limited quantities available. Vacuum secondaries for use on wide variety of vehicles. Double springs? 08-08-06 08:08 AM - Post# 982332 In response to Blaine that "BOG/STUMBLE" is a much more likely result of a classic case of an acellerator pump shot voluume thats either not large enought (not enought CCs of gas) resulting in a gulp of leaner than ideal air in the manifold, or one thats not lasting long enought,(begins too late or ends to. with a 5 speed and 12 bolt posi with 4:11's. 780---> Side view of secondary vacuum linkage/manual choke if equipped as on the 3310. If they are opening at these low rpm numbers you have a devil of a time getting leaned out. Being a 4160, it doesn't allow for changing jets on the secondary side so I purchased a conversion kit and pulled the carb off. Looking at the vacuum operator, it draws a vacuum signal from the venturi of the secondary. You have no items in your shopping cart. Q-850-B2 WITH CHROME BOWLS AND LINES. Holley makes a number of different springs with different tension on the springs.