Carburetor Power Valves Video - Holley Carb Tuning DVD

Buy the "Holley Installation & Tuning" DVD http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html

This section shows some of the power valve kits available from Holley Performance Products and what the numbering means. This section will help you choose the proper kit for your engines needs.

If you buy a brand new Holley 4-barrel, this DVD now comes in the box with every purchase. If you already own a Holley carburetor or would like to learn about the internals of the all-time, most popular modular style carburetor, this is the DVD for you.

It's the ultimate installation, tuning and troubleshooting guide for the Holley modular style carburetor. This disc will also help tune and troubleshoot any other brand of modular style and some one-piece style carburetors.

Menus are full of bonus information and detailed animated tours of carburetor
internals and accessory kits.

Get the full DVD with all of the interactive menus, detailed animated tours of internals and accessory kits here...
http://store.boxwrench.net/Holley-Install-Tuning-DVD_p_12.html

Don't forget our Basic Engine Building DVD. This video is great for people interested in car repair, car care, and restoration. As well as hot rods, muscle cars, performance parts, and boosting horsepower. It can also help you to gain knowledge for increasing fuel economy, how to lower your emissions, and covers preventative maintenance to avoid little things like overheating.

Sample clips on our YouTube page and at our store here...
http://store.boxwrench.net/Basic-Engine-Building-DVD_p_8.html

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Category:

Autos & Vehicles

Tags:

• holley
• carburetor
• power
• valves
• carb
• tuning
• how
• to
• engine
• building
• rebuild
• double
• pumper
• 4150
• V8
• repair
• video
• dvd

[88l98vette]

Great video. I have a 4160 80508 that I put a kit on because of leaking needle and seals. After the kit I am getting a pronounced stumble from off idle to full throttle only. Roll on the throttle and it's okay. I have 9 to 10 " vacuum in drive. I adjusted the accel pump as suggested but still have the stumble. The kit had gaskets, a 50cc pump instead of my 30cc, a 65 power valve same size as my old one, Any ideas.

[BoxWrench]

@88l98vette You very likely don't need that 50cc upgrade to the accelerator pump system, but you can leave it in place if you really want to.

If you just stick with the stock 30cc pump and then start with tuning the accelerator pump cams that screw into the back of the throttle lever, you may solve your issue.

You may also need to upgrage the size of the accelerator pump nozzle (squirter) to get the off-idle stumble to smooth out.

we have a video for the accelerator pump cams here at YT

[wakawu]

Thanks for these videos, very very helpful! I had a question regarding my Holley 4160 carb. I tried tuning it the best I can with the idle mixture screws on both sides and got it to idle and startup pretty well. My problem now is when I give it wide open throttle or mash on the gas at any point I get a slight hesitation sort of a choke not really a backfire. I have to roll on the gas slowly to give it full throttle. Any suggestions?

[BoxWrench]

@wakawu

You're experiencing an "off-idle" hesitation as soon as you touch the pedal. The term "off-idle" isn't a perfect description of the problem as you and others experience the same hesitation throughout the powerband when ever you mash the pedal.

Your problem is the Accelerator pump circuit, it has tunable components. One is the accelerator pump cam, the other part is the 'primary squirter'. Just search "Accelerator Pump BoxWrench", we have a video describing the tuning here on YouTube

[kd5icr1967]

I have always devided the vac by 2 then going one step under that. Ex, 14/2=7 so I would run a 6.5. That has always worked well for me. JMHO

[BoxWrench]

@kd5icr1967

yes, you are correct in your baseline power valve tuning calculations. We have shown the same recommendation you recommend in this video... if you watch from 1:35 from this video, you will hear the same recommendation from us that you describe here.... take a vacuum reading and divide the number by '2'. If the number you arrive at is not directly available as a Holly Power Valve numerical rating, then use the next lowest Power Valve available below it, just as you suggested

[elcaminomann]

You guys are very cool, I can tell you spend a lot of time and money to do these videos....Thank you for your time and information....

[shocktech4]

wafrederick ur on crack man.. my 350 had a 650 edelbrock on it b4, we took it to the dyno once my bowtie heads and Nx268 cam was in made just over 355 hp, we stuck a out of the box holley 650 with mechanical secondarys and it made an extra 15hp.. thats alot of hp by just throwing a carb on.. now ive replaced the base plate, and jets and it pulls harder then ever!! and i drive my 81 cutlass everyday rain or shine.. and Snow bec im from British Columbia..

[stangredemption]

@71bee383 Good lesson learned. Tail not tucked but head held higher now LOL. Thanks for that knowledge though I needed it.

[71bee383]

@stangredemption ? Edelbrock did make a Quadrajet, but they STILL make the AFB & a AVS (good ol' Carter carbs). they dis-continued the Quadraturd when they realised that they weren't selling. I would take a Thermo-quad over the Rottenchester any day of the week. BETTER fuel economy & more CFM's.

[stangredemption]

I know this is a way old post but Edelbrock IS a quadrajet my friend... Well based on them

[72charger440se]

my 750 double pumper keeps flooding on me i think, it would start spitting and sputtering really bad and then it would cut out unless i floor it to try to prevent it from dying.

[ACZxGalm2]

@2LateIWon I'd assume so yes.



[kamphwagon1]

@tucsondog Yeah those ole Q jets are allright on a stock engine untill the main well plugs start leaking or the primary meterig rods start sticking ,once it's kit time for one of those there nothing but a pain in the butt... Sound dosen't make HP ,when some one can get 2hp per CID on the dyno with a Q jet like a Holley then I might take a look at one !..........

[2LateIWon]

So if I screw it all the way in and it still runs the power valve is broken for sure?