Supercharged compression ratio

Asked by Dec 31, 2015 at 10:48 AM about the 1999 Pontiac Grand Prix 4 Dr GTP Supercharged Sedan

Question type: Maintenance & Repair

How was the compression ratio dropped when the
supercharger was added to the 3800 was it the
pistons or the heads

2 Answers

27,535

all 3 with the head gasket.

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79,795

Head gaskets may be different but it is the pistons that lower the compression ratio. Here is a read for you --- https://en.wikipedia.org/wiki/Buick_V6_engine#L67_Supercharged_2

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