Re: measuring piston rise

[Dave & Marlene <rusd@velocitus.net>]

Due to the shape of the "jet bridge" the piston vacuum pickup point is 
actually in the open space between the venturi & the butterfly & in 
effect NOT in the venturi.

Dave Russell

Randall Young wrote:

> Unless a HIF is quite a bit different than the earlier models, the piston
> gets it's vacuum signal directly from the venturi, which should be quite a
> bit more than the vacuum between the piston and the throttle plate.

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