Compression Test Corsa B X12XE 2000 1.2sxi

[r1_marshy]

Please help me.
I have carried out a compression test and have the following results

210psi
150psi
120psi
160psi

extremely varied I know.
Question: what the hell are they meant to be?
I have read my Haynes from front to back and back to front, I have scoured the internet and cannot find any recommended compression readings?
How am I meant to know what's normal etc??!!

As in my previous post my engine is revving erratically as and when it wants!!
Thanks

[LesterPiglet1]

I'm not sure what the standard is but I would worry if there was such a variation as you have. I would expect them to be within 20psi of each other. Try putting a bit of oil in the bores and test again. If they improve it would point to piston rings.