I recently got my motor built. Its only been running for less than a year and is already having ALOT of problems... It has 11 to 1 CP pistons with H-Beam eagle rods. The head was rebuilt and was ported and polished with a 262 cam. I put a 6 puck racing clutch and a 9 lb flywheel. Now that you know what the motor consists of... the PROBLEMS... the compression started at 160Psi and now is at 95-105 from top to bottem... it broke the timing belt a couple months after it was built and when i put one back on i checked the compression and it was fine but now it is really low. Another thing that is wrong is i dont think they balanced the motor cause it shakes alot all the time... and when i first start it up it sounds horrible and starts to quiet down after it warms up but still doesnt sound good. My power went down hill alot and it always wants to die havent coming to idle. I have heard the CP rings are known for having low compression. What should i do?

 

did you break it in properly?was the timing belt replaced?

 

yes it was broke in properly.... and yes the belt was brand new...

 

is this a daily or a race motor? I know race teams that rebuild their motor every six months. Is the tune good? I know untuned motors that wont last a week. need more info.

 

daily driver for the most part. and the only thing it was tuned with was a SAFC...

 

That might be your problem right there. I don't know how accurately you can tune with an SAFC. Also, you're 11:1 compression ratio shouldn't have given you 160psi to start with. My CX 8 valve measured 160-165psi with worn rings after 170k miles. I think you should've been above 200psi right after the rebuild...maybe in the 220psi range?

 

Low compression could also be caused by a bad head gasket. I presume this is not the culprit as you did not mention that you were losing coolant or oil or that the exhaust was smoking. I would suspect the piston rings need to be investigated and or replaced.