Quote:
Originally Posted by big gear head
The bypass is only supposed to open when the oil filter is clogged.
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Not true. At least with sbc & bbc. The bypass valve (BV) opens @ 17-18 lbs of pressure. The engine, while running, is constantly by-passing oil from the filter. In other words, while the engine is running, a % of unfiltered oil is always going through an engine. It was designed that way and that bypass should never be plugged. The engineers that designed the oiling system felt it was better to have some dirty oil, than no oil at all.
Back to the OP. There are only 3 causes of pegged oil pressure I am aware of 1) defective gauge- get another gauge and test to rule out gauge 2) stuck pressure relief valve in oil pump- remove pump repair or replace ( 2nd option preferable) 3) oil galleys plugged with foreign matter-tear down engine.
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979
FULL OWNER HISTORY
69 Dick Harrell tribute Day II 427 M20 4.10 X11 76 orig pnt, 711
67 Super Stock 302 Camaro re-creation