Compression pressure

[John Mason]

Hi Barry, I am not like you a trained mechanic but have messed with cars all my adult life. My Ruby gives compressions of around 100 on three piston and 90 on the other. Something I am going to investigate when the weather warms up a bit. Not wishing to teach grandmas etc. With your engine having done all the valves there should be no leakage there. Although your pistons and bores look good have you done a compression test with a squirt of oil down each plug hole to check if there is any leakage there.
Having said all that if it starts and runs well what is there to worry about. If it ain’t broke then don’t fix

John Mason.