Holley Power Valves
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
Holley Power Valves
Standard & Hi-Flow, what is the difference?
Is it so that standard 4,5 and Hi-Flow 4,5 open with the same vacuum reading, but the "jet size" is bigger in Hi-Flo version meaning that the enrichment is bigger after it opens up?
If so anyone having an estimate what is the difference...I mean if I plug totally the PV it has been said meaning 8.10 jet sizes that I need to go bigger with main jets (yes I know the economy will suck after that) so could it be worth 2 or maybe 4 main jet sizes between the flow of these two types of Power valves?
And one more question: how do I identify the two types from each other (need to know which one my existing is...)
Is it so that standard 4,5 and Hi-Flow 4,5 open with the same vacuum reading, but the "jet size" is bigger in Hi-Flo version meaning that the enrichment is bigger after it opens up?
If so anyone having an estimate what is the difference...I mean if I plug totally the PV it has been said meaning 8.10 jet sizes that I need to go bigger with main jets (yes I know the economy will suck after that) so could it be worth 2 or maybe 4 main jet sizes between the flow of these two types of Power valves?
And one more question: how do I identify the two types from each other (need to know which one my existing is...)
Last edited by Vesa; Jul 20, 2007 at 09:25 AM.
Racer
Joined: Apr 2006
Posts: 477
Likes: 43
From: Millbrae California
a high flow power valve is used in a application such as a engine that runs on alcohol where the PVCR (power valve channel restriction) in the metering block is much larger than the normal restriction is. there is no advantage to using a high flow power valve unless the PVCR flows more fuel than the standard power valve flows.
i hope this helps henry @ olescarb
i hope this helps henry @ olescarb
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
a high flow power valve is used in a application such as a engine that runs on alcohol where the PVCR (power valve channel restriction) in the metering block is much larger than the normal restriction is. there is no advantage to using a high flow power valve unless the PVCR flows more fuel than the standard power valve flows.
i hope this helps henry @ olescarb
i hope this helps henry @ olescarb
I sit so that those carburetor meant for alcohol usage come from factory with larger PVCR and thus you have a choise to use standard or hiflo PVs and using the hiflo means richer mixture during power situations?
Thread Starter
Burning Brakes
Joined: Mar 2004
Posts: 816
Likes: 1
From: Finland
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