| Go back to previous topic | | Forum name | Turbo/Nitrous Tech | | Topic subject | Compression numbers on rebuilt motor after 350miles. and Break-in info. | | Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i8&topic_id=87856 |
87856, Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by sike, Jul-10-05 01:08 PM
Ok, I did a compression test for the first time today and got 185-185-175-175. I'm assuming the rings would be completely set by now. Are these numbers decent? I should be 185 across the board, corret? Can I expect to get that extra 10 within the next 650 miles? BTW plugs looked good when I pulled them, a few blueish specs on #3 and #4 but they were barely noticable. Here's how I did break in so far.
I let it idle for 15 mins the first time, shut it off and ran it again for 30-45 mins.
Then I started driving it. The first time out I did not get on it at all, just a 5 mile easy cruise to ensure there were no leaks or breaks.
Took it home and let it cool overnight.
Then for the first 50 miles I drove it easy not going over 5000rpm, and only going to 5000rpm to let 3rd gear wind down. I did maybe 10-15 pulls in 2nd and 3rd gear letting the rpms wind down to around 2200rpm.
Continued to drive it easy, without letting the motor see boost at all.
At 100 miles I changed the oil and started to normal driving, only boosting when needed in normal driving, no hard pulls.
After about 150, I got on it a few times, maybe 60% throttle, nothing over 5000RPM.
Then after 300 I did one short pull at WOT in 2nd and 3rd, and I've pretty much been driving it easy still, getting on it A LITTLE BIT, every so often.
Anything wrong with what I have done? Should I continue to baby it or am I pretty much free to drive it as I like now? I'm going to change the oil again at 500. The oil has been staying very clean. I plan to change to synthetic at 1500.
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87857, RE: Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by sike, Jul-10-05 01:11 PM
Oh yeah motor specs:
JE 8.8:1
Eagle H-beam
ARP studs
T3/T4 .60 trim
Accel 335cc/m
SFMU @ 20psi idle (largest disc, hard spring)
45 psi FP @ 4psi boost ??
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87860, RE: Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by eclipse982nrRST, Jul-10-05 02:41 PM
what rings do you have?
i have total seals and my compression was 180-180-180-185 on 480 miles, i checked it again at like 700 miles when it was hott as fuck and some reason i got, 170-170-165-160. lol dont know,i do know total seals suck and i will be swapping them out this winter though!
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87861, RE: Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by sike, Jul-10-05 02:54 PM
JE rings. That was a cold test also. Totally forgot to warm the car first.
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87862, RE: Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by PowerEclipses, Jul-10-05 02:59 PM
Originally posted by sike
JE rings. That was a cold test also. Totally forgot to warm the car first.
you just answered your question right there do another one warm and tell us the results
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88065, RE: Compression numbers on rebuilt motor after 350miles. and Break-in info.
Posted by extreme97nt, Jul-20-05 05:24 AM
Beat the shit out of the motor and check them I bet they are even.
best time so far 14.3 @ 101.1mph(no traction)
www.cnnmotorsports.com
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