compression question

[dsmfreak20]

hi i have an interesting question. i have a motor thats just been freshly rebuilt. it has about 2600 miles on it. motor has wiseco 9-1 compression pistons, eagle rods, the motor has been bored .20 over and decked as well. the head was decked as well and had new valve stems installed. it has crower stage 2 cams hks valve springs and titanium retainers as well a mhi big 16g. the motor had a full synthetic in it for the first 150 miles until i took to a shop to get some timing adjustments. they changed it to a 30w with detergent and they said it was the best way to break in the motor. at 2000 miles i cahnged it to full synthetic again. i did a compression test the other day ( dry ) and the results were 90 90 95 95. motor was warmed up. now is it because the motor only has 2600 miles on it or am i looking at a bigger problem here? thanks in advance for the help.

 

[xveganxcowboyx]

I *believe* that would be due to your rings not having seated yet. It seems low even for that, but that would be the only explanation I can think of. Then again, I've never compression tested a fresh engine before.

 

[dsmfreak20]

but how long is it supposed to take for them to seat.

 

[Boost_inthebox]

Typically less than 1k miles ... thats really, really odd.

 

[SlowSpyder]

Check your cam timing

 

[dsmfreak20]

ill check it again but the shop i went to set it. when i took it in the exhaust cam was off by 1 tooth so the car was running terribly. when i got it back from them it was stupid fast for like two days then my old turbo blew up and everything went to crap again. now the car takes about a good 3-5 minutes to ge to start in the morning. once it gets warmed up it runs fine and itll start right back up. i do have a problem with my isc but it seems like more then that. am i wrong?

 

[toomey200]

was your motor broken in properly?

 

[dsmfreak20]

depends on who you talk to. started it up let it run for 25-30 mins. stopped it changed the oil then took it it to a shop a week later and they changed it to a 30 w/detergent. was ran at varying speeds. mostly around town but i opened it up abit too. i was told to do that to help seat the rings.

 

[dsmfreak20]

somebody help.......i dont know what to do short of taking it to a shop and paying an obscene amount of money to have them tell me the problem. is a 9-1 compression ratio just to high to run with any tuning? i have an safc 2 in it but i dont wanna adjust it too much until im absolutly sure of what im doing. im just very frustrated ive put alot of work into my baby and i want to enjoy it. are the crower stage 2's too agressive to run on stock timing? im first time to tuning a car with so much done to it. thanks guys..........

 

[chanley talon]

This may sound crazy but are your cams tightened down properly . I would pop the vavle cover and see if they are torqued down . I have seen them come loose . Because you should have super compression . Another question does you car smoke?

 

[dsmfreak20]

wouldnt i notice some other type of problem if my cams were loose...?

 

[TurboTJ]

I am rebuilding my engine on my 2G and the shop told me to not let the engine see boost for at least the first 500 miles. They said to drive it at varying speeds but to disable the turbo until the engine is broken in. Did you drive it under boost pressure?

 

[dsmfreak20]

yea. thats the first ive heard that you shouldnt drive under boost. ive had other people tell me that actually driving the car is the only way to get the rings to seat. i dont know........

 

[dsmfreak20]

UPDATE: all of my intake valves are BENT!!!!!!!BENT!!!!!!! after i paid a machine shop to go through and clean and check the head they didnt catch it. the head was leaking a good 80% through the intake valves. the new place that just took off the head checked the degree on the valves and ALL of them are bent..............i also guess the original owner was not entirely honest when he said the head had just been rebuilt last year or he left out that it broke a timing belt.............sigh.........just venting. thanks for all the suggestions guys. just an excuse to put stainless steel valves in it now. car should be alive again in a week.