Tag: TR4

By on April 28, 2010

Ken Dowd writes:

I’ve got high compression readings of over 190 lbs on all cyls on my TR4.  The head has been reworked twice that I know of, about .050 has been shaved.  I got these readings after putting the engine back together with all new sleeves, pistons, rings and a head/valve job.  I CCed. the head at 55cc and crunched  the numbers on several online compression ratio calculators and figured my compression to be about 9.5:1   Compression ratio on the stock engine is 9:1. Would you expect to see such  high compression readings with such a small increase in compression ratio?

I’ve searched the world over and cannot find a spec for compression on a healthy 2138cc TR4 engine.  Do you have any experience with after market solid copper oversized (thicker) head gaskets to bring down compression? That is the only thing I can come up with. Your thoughts would be appreciated.

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