so if it is rings can I just replace rings and be good or do I need to replace pistons and hone cyl?

 

You always hone the cylinders when you change the rings. If not they won't seat properly, but if you have to ask you should probably take it to someone experienced with s2ks. Check ebay for a blue point leak down tester.

 

Those numbers are perfectly within the factory specs.

 

well put little bit of oil in cyl and here is what happened....


cyl 1...245psi
cyl2...235psi
cyl3...250psi
cyl4...240psi

so that means it is the rings right?

 

See now the good part is that all your numbers are still within limits but here you go

note, you shoudl use about 1 tablesppon max oil per cylinder, no more shoud dhave said that first time for best results.

If the compression reading goes up with oil in the cylinder, the piston rings and cylinders may be worn and leaking pressure. The oil will temporarily coat and seal bad compression rings to increase pressure; however, if the compression reading stays about the same, then engine valves or head gaskets may be leaking. The engine oil seals the rings, but does not seal a burned valve or a blown head gasket. In this way, a wet compression test helps diagnose low-compression problems.

 

what is the limit's of an ap1 compression psi?

 

or better what are the lowest and highest per factory supposed to be

 

What altitude are you at?

 

I heard numbers dont really matter since all gauges read differently. As long as theyre all within 5-10 psi of each other then your good to go.

 

so I'm making the same power at 200psi across the board vs 240psi as long as the numbers are close? Im at 2400 ft. idaho