compression after rebuild?

UNjim

Cadet
Joined
Aug 11, 2009
Messages
29
What kind of compression would you be looking for after rebuilding a '56 Johnson 30HP. What did they have originally? THANK YOU!!
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: compression after rebuild?

Both cylinders within 10%. That cannot happen unless both are relatively healthy.

DO NOT get psi paranoia. There never was a spec and as long as guages, technique and conditions are inconsistent there never will be.

Typical readings could be anywhere from 50-60psi to 140-150psi.
 
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