18RGR just rebuilt new rings etc 110PSi compression

[blanky]

Ive Just rebuilt the 18RGR after it spun Number 4 con-rod big end while being test drove buy some youths in Darwin unlawfully

I replaced all the bearings rings and so on ,
I've got the pistons with 8.5 on the top and the head has be ported and polished prior to the thrashing with only 300klm on the clock(basicly new)

compression only showed 110 psi +/- 5 over the others

i was thinkinfg deck height but the piston where at the top op the block to start with

any ideas

[lilcrash]

How many km have you done after the rebuild?

[blanky]

Just finished the rebuild yesterday

I had the same compression before the car was stolen so I was going to do rings to sort this out but had to do the whole engine

But I still have the same problem of low compression

[lilcrash]

If it's not run in you won't have any compression because the rings haven't bed into the bores.

[lilcrash]

I personally wouldn't test compression until you have run it in for about 1000km

[lilcrash]

Pour some oil in the bores and try again, it it raises your rings might be wrong. But since it was the same before I would guess it could be your valves leaking.

[blanky]

I can't imagine that the compression will come up 40psi

Maybe the green book refers to the good 9.7 pistons and not my 8.5 pistons

[lilcrash]

Mine had over 160psi before the rebuild. Mine is an rgeu