Hello from Manchester,England
 

Hi boys and girls,
I'm Paul from Middleton,near Manchester residing with my collection of Ford Sierras,and car parts in my living quarters:o;D Well,if I enjoy working on my motors,I can't be avoided. Everytime I try to tidy up,I can never find things;D so I don't bother:)
I won't go into my projects on this topic,I'll post it elsewhere on this forum. I stumbled upon this forum whilst doing a google search,converting compression psi to ratio,as my neighbour reckons that it can be done,to avoid the aggro of taking the cylinder head off. But I mentioned that it isn't the correct way,physical measurements are the correct way. My neighbour has very little tolerance:)

chat to you all later
Paul

welcome to the forum!!!!!!!

Welcome to HMT. Like your neighbor said, a "general" compression ratio can be achieved, if you know the displacement of the cylinder in question, and technically he will never egt the same reading twice, as all parts wear down differently, as you already know :)