Non-Cam Valves

[Greg Hermann]

>The exhaust valve is also a special problem. The pressure in the
>cylinder when the exhaust valve needs to open is in the area of
>300-1500psi. A dinky 1.5in exhaust valve has a surface area of 1.75 sq
>in so even at 300 psi you need a minimum of 523 pounds force to open the
>valve. Bigger valves and earlier opening just make it worse.

Good concept Bob, but pretty high with the pressure numbers.

Residual pressurein the cylinders ranges from 50--90 psi at the EO event in
an NA engine, depending on expansion ratio and cam timing. Proportionally
higher in a boosted motor.

Regards, Greg
>--
>Robert W. Hughes (Bob)
>BackYard Engineering
>29:40.237N, 95:28.726W
>Houston, Texas
>rwhughe at ev1.net
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