compression readings
#1
hi im in need of a bit of help, can any one tell me what are the best compression readings for a 1994 13b turbo engine, still standard, iv had a good search on the web but not had a clear answer,
Best regards Guy
Best regards Guy
#2
On page 1-11 of my Mazda service manual (it's for 1988, but it would still apply) there are two graphs. One for compression pressure vs. cranking speed, and another for altitude compensation. Compression should be 85 psi at 250 rpm, with not more than 21 psi difference between chambers.
In my experience, healthy engines show numbers around 90 psi on a conventional compression gauge with the valve core removed and a healthy battery turning the engine over.
Hope this helps!
In my experience, healthy engines show numbers around 90 psi on a conventional compression gauge with the valve core removed and a healthy battery turning the engine over.
Hope this helps!
#3
Originally Posted by guyus86' post='918411' date='Mar 15 2009, 09:19 PM
hi im in need of a bit of help, can any one tell me what are the best compression readings for a 1994 13b turbo engine, still standard, iv had a good search on the web but not had a clear answer,
Best regards Guy
Best regards Guy
#4
From what i've been told 110psi is the mark your aiming for. Thats what i was told by the people who rebuilt my engine.
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