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07-16-2016, 03:00 PM | #1 |
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Power valve?
I've got a 68 Camaro stocker that currently has a 461 in it.I've always ran a primary pv in it when it had an automatic,it now has a stick,no changes to the engine.It's very choppy in 1st gear going thru the pits,clears up halfway thru the gear.Do you stick guys run power valves?
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07-16-2016, 03:23 PM | #2 |
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Re: Power valve?
Sorry,I meant to post this in tech.Will the moderator please move it? Thank you.
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07-16-2016, 03:31 PM | #3 |
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Re: Power valve?
A power valve will help but you dont want it to rupture if you ever had a backfire! I never run them have had good luck without!
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07-16-2016, 05:20 PM | #4 |
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Re: Power valve?
Just to be clear,it does have a pv in it now,same one that it had with automatic.
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07-16-2016, 07:08 PM | #5 |
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Re: Power valve?
Power valve is only affected by engine vacuum. and it must be closed at idle The # on the PV body is the inches of vacuum it will open.
Check the engine vacuum and use a PV a couple inches higher. Think I got it right. Last edited by Chevy55; 07-16-2016 at 07:11 PM. |
07-16-2016, 08:24 PM | #6 |
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Re: Power valve?
Maybe around a 3.5 PV just a guess?
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07-16-2016, 08:30 PM | #7 |
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Re: Power valve?
I've been advised to do away with any PV...no more guess work.
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Rich Taylor I/SA - 321 |
07-16-2016, 10:59 PM | #8 |
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Re: Power valve?
I never run them my homemade carbs get the job done!
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07-17-2016, 10:51 AM | #9 |
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Re: Power valve?
Thanks everyone. Power valve is correct for engine,even tried a new one,cleaned out carb,blew it out,float level and fuel pressure checked.This carb worked very well with a foot braked auto,crisp and did not have the problem going thru the pits in 1st gear.Problem started with stick installation,it's choppy and surges until about 2500-3000 in first then is fine.I just wondered if the stick guys pulled the valve....I'm going to order a block off plug and up the jets......Thank you.
Last edited by Dana Fitzpatrick; 07-17-2016 at 12:02 PM. |
07-17-2016, 11:42 AM | #10 |
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Re: Power valve?
I am watching this question with interest.
*one thought, when driving at low speed only have the throttle open a small amount and regulate the car speed by selecting whatever gear gives the desired pit road speed. *I have experimented with power valves on gas carbs. I like the low speed performance and cleaner when staging with footbrake. With trans brake leaving where you are wide open on converter or two step I do not run a power valve. *I do know it is common with Methanol carbs to run a primary power valve. It may mostly come down to personal preference. I would like to know the % of who runs what. |
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