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Compression values on B18 engines 120-130

posted by  Phil S. on  Tue Feb 22 12:29 CST 2005
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last visit: Fri Oct 24 13:18 CST 2014
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In theory, low compression engines (B18A, B18D, B20F) read somewhere in the 140-150 PSI range, and high compression (B18B, B20E) more like 165-175 PSI. Carbureted B20s are medium compression, so split the difference. (Sorry, I don't know what the metric units would be for this.)

In actual practice, though, the numbers are pretty meaningless because the tests are affected by many factors. All that's important is that all four cylinders read within a few percentage points of one another.






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