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1986 944 Engine Compression Tests

Engine

Vehicle Information: Model(924/944): 944; Year: 1986; Engine (type, size, modifications): 2.5; Total Mileage: 167,000;

I've just purchased this car and I'm about to replace the front seals, water pump and belts.Before I start this work I'd like to know what aacceptable compression reading is. I have a reading of 138-150psi.This car has passed its local emissions tests and the local service manager at the dealership believes this vehicle reading is acceptable. I realize that this isn't the highest reading for this vehicle but I like to think that I could get a few more years of service before a complete engine rebuild. Also how do I check for possible blowby?

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