Holley secondary jet tuning

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I've been tuning on my Holley 750 dp mechanical secondary and it was pulling slow in the higher rpm so I started messing with the secondary accel pump and it was bottoming out at wot, making me think that was the problem so I backed it off and moved the cam to the #2 screw hole, there was some slack between the back of the lever and the cam in position #1, is that normal or should there be no ...The power valve opening is the equivalent of about nine or ten jets. Your secondary jetting should take this into mind. The power valve jetting is static unless you want to drill out the restrictor holes. I wouldn't. I would tune the WOT with the secondary jetting. Nov 19, 2019 · While tuning the accelerator circuit can certainly help dial-in any Holley, it’s also important to mention that all of these changes do little to help if the engine is not in proper tune. A sharp carb tuner whose name is lost to history once said: “Ninety-percent of carburetor problems are ignition related.” Holley 600 vac secondary tuning. Welcome, guest. You last visited: Yesterday at 10:50 PM ... On 2 corner idle I can use the factory Holley secondary block that has a .038 IR. It would go a little lean between 25 and 30% throttle on a 4 corner idle with a smaller IR. ... With a 750 on my 383 with AFR 190 cc heads a secondary jet in around 80 to ...I took our mild 350 to the Thursday test and tune at the track to dial in the carb and timimg. I think the 72's are alittle rich, I would say a 68 or 70 for mains. With a manual tranny and your cam I would go to an 8.5 power valve. The kit to convert your Holley to a quick change secondary spring system is really cheap as is the spring assortment.How To Tune Holley Carburetors. How to tell what size carb you need: You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. If you have an automatic transmission you will need a vacuum sec. carb, a standard transmission can use a Double Pumper carb. Adjusting secondary plates to Holley's recommended .020" exposure of transfer slots and adjusting Air Fule Mixture. Ok the "idle" maxture screws have nothing to do with the jets becasue they come into play in a different RPM range (hi speep circuit). Dec 11, 2003 · Holley has always offered vacuum-secondary performance carburetors in two versions--4150 models with replaceable jets in the secondaries, and 4160 models with a metering plate and no replaceable jets. How do I Tune a Holley 4160? Tuning a Holley 4160 is a simple process thanks to Holley's modular carburettor design. Each model of the Holley carburettor family, regardless of its size, is tuned the same way, by adjusting the float valve to control the fuel level in the bowl(s), How To Tune Holley Carburetors. How to tell what size carb you need: You take the engine cubic inch and multiply by the maximum RPM and divide by 3456. If you have an automatic transmission you will need a vacuum sec. carb, a standard transmission can use a Double Pumper carb.Jun 20, 2017 · Tuning Holley Vacuum Secondaries Some Holley carburetors are sold with the quick-change secondary spring kit already installed. A good example is this Street Avenger carburetor. Three different secondary springs are supplied with this carburetor. Dec 11, 2003 · Holley has always offered vacuum-secondary performance carburetors in two versions--4150 models with replaceable jets in the secondaries, and 4160 models with a metering plate and no replaceable jets. I took our mild 350 to the Thursday test and tune at the track to dial in the carb and timimg. I think the 72's are alittle rich, I would say a 68 or 70 for mains. With a manual tranny and your cam I would go to an 8.5 power valve. The kit to convert your Holley to a quick change secondary spring system is really cheap as is the spring assortment. Nov 19, 2019 · While tuning the accelerator circuit can certainly help dial-in any Holley, it’s also important to mention that all of these changes do little to help if the engine is not in proper tune. A sharp carb tuner whose name is lost to history once said: “Ninety-percent of carburetor problems are ignition related.” Hello. I'm really hoping for some pointers tuning the accelerator pump system on my truck. I can't seem to get it figured out, and I'm not sure where I'm going wrong. 1977 3/4 ton Chevrolet truck Probably 4400lbs 37" tires, 4.56 gears 700R4, stock torque converter L31 Vortec crate engine, stock except for 1.6 roller rockers and Edelbrock Performer intake Holley 80570 570cfm vacuum secondary ...HIGH PERFORMANCE TUNING INSTRUCTIONS FOR HOLLEY PERFORMANCE CARBURETORS 199R7849-2 NOTE: These instructions must be read and fully understood before beginning installation. If this manual is not fully understood, tuning should not be attempted. Failure to follow these instructions, including the pictures may result in subsequent system failure.How do I Tune a Holley 4160? Tuning a Holley 4160 is a simple process thanks to Holley's modular carburettor design. Each model of the Holley carburettor family, regardless of its size, is tuned the same way, by adjusting the float valve to control the fuel level in the bowl(s), Jul 27, 2015 · Vacuum Secondary Tuning . Considerable mystery surrounds the tuning of the secondaries on a Holley carb. In fact, it is not at all complex, but it can be time consuming. As mentioned earlier, by selecting the correct spring for the vacuum chamber, you take care of 90 percent of the tuning of the secondaries. Holley 122-240 Jet Assortment Kit Incl. 2 Of Every Jet Number From 70-79 Black Anodized Billet Plate Jet Assortment Kit ... Holley 550-851K Self-Tuning Master Kit ... Secondary Main Jet 65 Accelerator Pump Cam White I have adjusted the cam arm so that any movement of the throttle produces fuel from the pump jet. When the carb is on the primary or secondary boosters everything looks great. AFR is anywhere from 12:1 to 13.5:1. I've been tuning on my Holley 750 dp mechanical secondary and it was pulling slow in the higher rpm so I started messing with the secondary accel pump and it was bottoming out at wot, making me think that was the problem so I backed it off and moved the cam to the #2 screw hole, there was some slack between the back of the lever and the cam in position #1, is that normal or should there be no ...Vacuum Secondary Tuning . Considerable mystery surrounds the tuning of the secondaries on a Holley carb. In fact, it is not at all complex, but it can be time consuming. As mentioned earlier, by selecting the correct spring for the vacuum chamber, you take care of 90 percent of the tuning of the secondaries.Adjusting secondary plates to Holley's recommended .020" exposure of transfer slots and adjusting Air Fule Mixture. Ok the "idle" maxture screws have nothing to do with the jets becasue they come into play in a different RPM range (hi speep circuit). I'm having trouble tuning the holley on my 54. I can't get it to idle down. It also seems to be running a little rich. I followed the directions on the holley site to set the idle mixture. There directions where to turn them all the way in. Then turn them out 3 full turns.Quick Fuel Technology® (QFT™) ships carburetors only after they have been thoroughly run-tested and adjusted on a typical engine. Engine testing all carburetors prior to shipment ensures that when a new QFT™ carb is bolted on an engine, it will start, idle and perform up to the customer's expectations. However, sometimes a little more fine-tuning is needed because the customer has a ...Adjusting secondary plates to Holley's recommended .020" exposure of transfer slots and adjusting Air Fule Mixture. Ok the "idle" maxture screws have nothing to do with the jets becasue they come into play in a different RPM range (hi speep circuit). QuadraJet carbs have three basic tuning variables, and these get people all confused: Primary Metering Jet, Primary Metering Rod, and Secondary Metering Rod. Attempting to cure problems by tuning the wrong variable results in lots of frustrations for tuners and car owners. These systems at times overlap in their operation. Holley carburetors powered every Monster Energy NASCAR® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS scene as well. Re: Holley Carb Tuning with O2 indicator Your post is hard to follow, but I would close down the secondary idle speed some and run more on the primary slot, put a vaccum gauge in it while you doing this it sounds like your not using the power valve, but the way your driving it you might try a two stage power valve, or your spark curve is off ( what is it, and curved at) it may not like the ...Hello. I'm really hoping for some pointers tuning the accelerator pump system on my truck. I can't seem to get it figured out, and I'm not sure where I'm going wrong. 1977 3/4 ton Chevrolet truck Probably 4400lbs 37" tires, 4.56 gears 700R4, stock torque converter L31 Vortec crate engine, stock except for 1.6 roller rockers and Edelbrock Performer intake Holley 80570 570cfm vacuum secondary ...