Mechanics

CYLINDER COMPRESSION

1998 Ford Cobra

Engine Mechanical problem
1998 Ford Cobra V8 Two Wheel Drive Manual 50000 miles

I recently bought a used 1998 cobra mustang 4.6 dohc. The seler told me the engine was rebuilt. I would like to know what the compression test result should be for good cylinder compression, stock. Seller wasnt sure if the compression ration had been dropped or raised.
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Smrod71
May 3, 2009.




You won't be able to tell compression ratio by a compression test. But if your compression is around 120-150 p.S.I. You should be ok. Make sure you do it correctly and there shouldn't be a 20% variance between cylinders.

Hmac300
Dec 17, 2009.


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