Reply to "4410 artical"

rockyMember

According to this article, by Holley, the power valve opens at the manifold vacuum referenced by the valve size....

http://www.holley.com/data/Tec...cal/power_valves.pdf

So:

65 = Opens at 6.5" or below
85 = Opens at 8.5" or below

Therefore the 85 power valve is actually opening at a higher manifold vacuum (earlier) than the 65 valve.

The Power Valve is SIZED by using the max vacuum at idle, then dividing by 2. That value is a "rule of thumb", not when the valve opens (as far as I understand it).

If this is the same article I saw, he also opened the PCVR (Power Channel Valve Restrictors) and increased the size of the squirter orifice. All these would tend to dump more fuel into the engine more rapidly when the accelerator is depressed...

I would hope he checked his manifold vacuum...

Rocky

4/29/136:44 PM

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