1937 Chief Compression Test

[lrgarrett]

When performing a compression test, what should the minimum psi be?

[sirhrmechanic]

More important than minimum on a compression test is consistency. If both cylinders are close... that's better than having a super high number.

Also, do a leakdown test. This tells you a lot more than a compression test. Get a leakdown tester (they aren't expensive). The leakdown test is the most important thing you can do to diagnose an engine's pistons/rings/valves/bore, etc.

Cheers,

Sirhr

[lrgarrett]

Thanks for information. Very helpful.

[duffeycycles]

Its a flathead.If you put your thumb over the spark plug hole and it feels like compression when you kick it over it should start