Low Compression???? Help Fast

[TsiTalon90]

Ok Ive posted before about my rebuild. This winter I had the head profesionaly done with cams heavy duety springs etc, removed balance shafts, replaced every gasket left the bottom end alone, Ive got it running pretty good within the past month (car is off the road) and I smelt gas in the oil, Ive talked to people and they said its probably just running pig rich with the 650's. I did a comp check and I got 110, 115, 115, 115 I did not do the cap full of oil test yet, but this is leaning me towards replacing my rings. But I heard I have to replace the pistons to. What are the steps in doing this?? Do I have to bore out the cylinders to????


Thanks Josh

 

[DSM90AWD]

I did a comp check and I got 110, 115, 115, 115 I did not do the cap full of oil test yet, but this is leaning me towards replacing my rings. But I heard I have to replace the pistons to. What are the steps in doing this?? Do I have to bore out the cylinders to????

I assume you performed the comp test with the engine at operating temp? Definitely do the oil test to make sure it's not just a bad head rebuild as generally you'd see one or two cyls down in pressure, not all four at once.

As for replacing the pistons, it's not required, but if the machine shop has to overbore the cyls (cyl warpage or deep scratches), you'd have to replace your pistons with new ones of the same overbore.