Last week me D16A6 engine was rebuilt with PM7 pistons , eagle rods, Y8 head gasket and a fidanza flywheel. While a it put in a Delta 260 cam. Gave it a break in and when my mechanic checks the compression he gets 210-195-195-210. Are these numbers good because before all 4 were at 180.

He says it could be the cam but i bought it being a mild street cam so I don't buy that reason. Any opinions??

Also, the car was detonating a lot. When he checked the ignition timing he found it was advanced 41 degrees. He took out the chipped ECU, retarded the distributor all the way back and adjusted the cam sprocket. He got it down to 32 degrees. The car stopped almost all detonation but feels extremely sluggish when the revs go past 4k.
He also thinks it could be the cam but I still don't buy it.

BTW, I use Shell 93 octane.

Thanks for the help

 

anyone???

 

I talked to some people about cams for my ZC running a pm7 computer and they said that they couldn't do anything with cams running stock computer without performance decreasing. Just a thought.

 

doesn't seem right to me.. My stock Z6 was getting #'s in the 190-200 range.

 

timing still seems to be way advanced, and your running in the low 12 point compression range..so detonation is whats going to kill that engine..you may have already done some harm..

 

Well, the exhaust was redone from 2" to 2.50". Tested the car yesterday and it felt completely different. Now its pulling hard all the way until redline. The valves were adjusted again and the spark plugs were changed to one with a different heat range. Will take care of a couple of deatils to then take it to the dyno. I'm hopeing it makes 140-150 whp. If it doesn't then something is wrong.

Anyone running PM7 pistons tested the compression ???