180000 mile engine with 160psi compression?

[jamiegallien]

I partially tore down my engine this weekend to change the oil pump, water pump, timing gear and gaskets. Before I got too far I checked compression, just so I could go ahead and do the head gaskets or a rebuild if needed while I'm there. One a supposed 180k mile engine, each cylinder was 155-165psi. On one hand, I'm glad the motor is in good shape, but on the other, I really hate not knowing what's been done inside. Isn't 155-165 a little high, even for a rebuild? I'm hoping somebody didn't rebuild the thing with a higher compression ratio than normal? Would that even be check-able with a compression test like this?

 

[bison]

It's not high. As long as there are no low cylinders I wouldn't be worried. I wouldn't open it unless you suspect. A problem. If it has factory head bolts it likely has never been opened.


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[jamiegallien]

It's not high. As long as there are no low cylinders I wouldn't be worried. I wouldn't open it unless you suspect. A problem. If it has factory head bolts it likely has never been opened.


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I def don't plan to open her up. I just expected much lower compression just from ring wear on such a HIGH mileage engine. I assume it has been re-ringed recently...