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Saabsite schematic is dated 11/93?
Posted by Eiron [Email] (more from Eiron) on Tue, 30 Dec 2003 07:57:45
In Reply to: OK, have the surprising answer - no & yes, Danc, Mon, 29 Dec 2003 16:57:23
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Hi Danc,
Basically, the orientation changes the way the valve reacts to boost pressure, & the way the diaphragm oscillates during partial boost.
For any given spring force, the valve is less likely to leak boost with pressure coming into the bottom port. So, if boost was increased but the same valve was used, it might be rotated to avoid "pressure leaks."
The saabsite schematic outlines another reason: hooting. The replacement part in the TSB has a now-common brass disk fixed to the diaphragm to stop noisey vibrations. But turning the valve so that boost pressure hits the diaphragm face-on (like Forge requests for their DVR valve) can also reduce cross-flow flapping.
posted by 64.207.44...
Test data I compiled earlier this year
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