I rebuilt a c1 engine a couple months ago and replaced the bottom end parts with eagle rods and srp 10:5 pistons with je rings-81.5 bore. Well I've put 1800 miles on it and the compression numbers seem like **** to me. I got 210 165 145 155. If I run the car and remove the oil fill cap there is a **** load of pressure in there. After 1800 miles is there still a chance these rings are going to seat or do I need new rings and hone and try again?. Is it possible to just re-hone the cylinders and use the unseated rings overagain? This was my first rebuild and apparently things didn't go perfectly. What could have caused the rings not to seat? I had the block sent out and bored and honed, I just assembled it. Shop did the head work too. How do I fix these crappy number and get it right the next time!!


Modified by jerseydevil at 5:57 PM 4/1/2004

 

Did you check the ring endgap and stager the rings? My advice anytime you get a block resleeved, bored, honed ect. always have the shop check the cyclinders for taper/out of round and the align bore right in front of you before you leave with it.

 

I when I brought the block in the cylinders were egg shapped and std bore. The shop bored em out to 81.5mm to fix it and then honed it. I installed the rings and gaped them myself, though I don't remember now what I gapped them to. I just speced them out by the card that came with the rings I picke a number that was half way between the spec for nos and street driving on the car to allow me to go for nos in the future. Maybe that was my mistake there, but if the gap was less than nos I would think it would still be an acceptable gap. As far as the gap possition, I did it per helm manual. Top ring and second ring were place 180 degress apart and on axis with wrist pin. I think oil rings were set about 25 degress off wrist pin axis and not inline with each other. I was told to keep the ring gaps off the trush areas of the pistons.

 

did you put the cams back in at the right spot??

maybe you have bent valves and that is where you are loosing compression

 

I put the cams in right. Intake on intake, exhaust on exhaust. I back all the valve adjusters all the way off, before I put the cam in and bolted down the caps. Then did timing belt and valve adjustment.

 

I did a wet compression test today and results are not good. In addition to my compression going DOWN since 2 weeks ago it responded to oil and the compression went up, which means bad rings.

First why is the compression going down???
this week they were 135/155/165/175.

How do I fix this? Can I just re-hone and try again with these rings or are they shot? They only have 2k miles on them.

Please help! I need this to fix this problem asap

 

shameless bump