Phil1 Posted September 29, 2016 Report Share Posted September 29, 2016 What should the compression be on my TR4 Engine?? Regards Phil. Quote Link to post Share on other sites
Motorsport Mickey Posted September 29, 2016 Report Share Posted September 29, 2016 Depends upon engine size 83 or 86mm pistons, whether the head has been modified for competition, what cam you have fitted, what carburettors and manifold you have fitted and even then it's a guess, give us a clue. Mick Richards Quote Link to post Share on other sites
BlueTR3A-5EKT Posted September 29, 2016 Report Share Posted September 29, 2016 What have you currently got? Tolerance of all within 5 psi of each other is a good rule of thumb. Quote Link to post Share on other sites
john.r.davies Posted September 29, 2016 Report Share Posted September 29, 2016 What should it be? Equal, +/- 5%, along the block. Compression gauges are neither precision nor calibrated. You cannot compare readings taken with two different gauges. You could if you used the same gauge on two different engines. John Quote Link to post Share on other sites
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