johnwill Posted November 2, 2021 Report Share Posted November 2, 2021 3 hours ago, john.r.davies said: It is impossible to compare two different compression gauges, they are not precision tools and are uncalibrated. The best they can do, and do well, is compare cylinders across the block. If all your cylinders are 123.5 +/- 5 then they are fine! I’d hoped that was the answer Quote Link to post Share on other sites
John McCormack Posted November 6, 2021 Report Share Posted November 6, 2021 On 11/3/2021 at 12:36 AM, john.r.davies said: It is impossible to compare two different compression gauges, they are not precision tools and are uncalibrated. The best they can do, and do well, is compare cylinders across the block. If all your cylinders are 123.5 +/- 5 then they are fine! Yep. I have two TR2s which I tested with the same gauge. The other car was 145-150 all the same. Both engines are 87mm bores, one with a TR4 head (the higher compression engine) and the other lower compression with the low port head. Quote Link to post Share on other sites
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