How to determine Power Valve
#1
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How to determine Power Valve
How do you determine the size of powervalve(s) to use? Im running a Holley 4010 with vac. secondaries. It has powervalves on the front and rear. It has no metering plates. I know that you need to know the vaccumn reading(s) to determine the size but which reading(s)? And isn't their a formula that you use with your reading(s) to get the correct size? Thoughts anyone
BH
BH
#2
You get your vacume reading at idle. The whole reason for the power valve is to give the engine more gas when it is under a load. You want the power valve to have a lower # than your reading so that it stays closed untill the throttle opens far enough or the engine comes under enough load to drop the vacume below the setting on the power valve. If you go too low than the engine will not have the fuel under load and if it opens too early you will have a real hard time getting the engine since it will always be too rich.
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Easiest way is to back boat in water and check it idling in gear on the trailer. Get a PV 1/2 - 1 point below your lowest reading..
Scott B
Ole smoggy transom
Scott B
Ole smoggy transom
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Originally posted by Scott B
Easiest way is to back boat in water and check it idling in gear on the trailer. Get a PV 1/2 - 1 point below your lowest reading..
Scott B
Ole smoggy transom
Easiest way is to back boat in water and check it idling in gear on the trailer. Get a PV 1/2 - 1 point below your lowest reading..
Scott B
Ole smoggy transom
Thanks
BH
#6
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Originally posted by BAD-HABIT
Scott: Shouldnt' I have it in the water I mean on the trailer in gear isn't near the load as in the water...Also how do you determine the secondary power valve???
Thanks
BH
Scott: Shouldnt' I have it in the water I mean on the trailer in gear isn't near the load as in the water...Also how do you determine the secondary power valve???
Thanks
BH
My secondary is the same as the primary on my SBC, tho I have been told to go one step higher by a friend recently.. It runs well, no smoggy transom, think I will leave it alone. Now my 454, thats a different animal. One day I will figure out that carb...
Scott B
Packing carb parts in a box, shipping them to the boat
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Thanks Scott....I will get to the water probally Sunday (Sucks BIG TIME having to work Saturdays) So it probally won't be till next week to try out the changes (if any)
Randy
"Bad-Habit"
Randy
"Bad-Habit"
Last edited by BAD-HABIT; 06-20-2003 at 03:28 AM.