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Registered
Join Date: May 2004
Location: Encinitas (San Diego CA)
Posts: 4,495
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Don,
I'm no expert, but I've learned a bit recently.
The check valves are shut below a threshold pressure. So the pistons do not receive cooling oil at idle. I believe they open above 3.5 bars. That figure was provided by Steve Weiner off of the top of his head. In a 964 engine, the factory spec says 2.0 to 2.5 bars oil pressure at idle and above 5. bars at 2500 rpm. As was already stated, seems like it would bleed pressure if the ball is missing.
Good thoughts on questioning the shape of the resulting spray.
Doug
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1971 RSR - interpretation
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