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When the valve closes pressure builds and loads the motor. Then the valve opens and relives the pressure.
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The ones I've experienced, probably over a dozen, don't work that way.
The ones I've worked on (Banks, BD and Pac) close the valve at idle. Sensor to control this is on the throttle linkage. There is only full open and closed at idle on the butterfly, no inbetween.
Unless you have 60lb exhaust springs there must be about a 3/8" hole in the butterfly.
Butterflies are vacuum actuated, full vacuum is applied to one side of the cylinder that opens/closes the valve and remains there depending on whether the signal is for open or closed.
I spent much time googling for a source of exhaust butterfly valves and found a source for inlines powered by an electric motor, all stainless steel, up to 6" and all under $200.
Sorry didn't save the link but it wasn't too hard to find.
__________________
Bill
'95 2500 4wd auto
'95 3500 5 speed heavy hauler
Not stock
Last edited by illflem : 01-07-2009 at 09:00 PM.