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Subject: "Compression numbers on rebuilt motor after 350miles. and Break-in info." Previous topic | Next topic
sikeJul-10-05 01:08 PM
Member since Aug 06th 2003
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#87856, "Compression numbers on rebuilt motor after 350miles. and Break-in info."


          

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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sikeJul-10-05 01:11 PM
Member since Aug 06th 2003
531 posts,
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#87857, "RE: Compression numbers on rebuilt motor after 350miles. and Break-in info."
In response to Reply # 0


          

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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eclipse982nrRSTJul-10-05 02:41 PM
Member since Mar 16th 2004
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#87860, "RE: Compression numbers on rebuilt motor after 350miles. and Break-in info."
In response to Reply # 0


          

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!

-MIKE-

Stroked 2.2L

  

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sikeJul-10-05 02:54 PM
Member since Aug 06th 2003
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#87861, "RE: Compression numbers on rebuilt motor after 350miles. and Break-in info."
In response to Reply # 2


          

JE rings. That was a cold test also. Totally forgot to warm the car first.

  

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PowerEclipsesJul-10-05 02:59 PM
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#87862, "RE: Compression numbers on rebuilt motor after 350miles. and Break-in info."
In response to Reply # 3




          

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


Boca Raton, Florida
95 Eclipse GS- sold
99 Eclipse GSX- 386awhp
98 Eclipse GS- sold
92 Prelude

  

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extreme97ntJul-20-05 05:24 AM
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#88065, "RE: Compression numbers on rebuilt motor after 350miles. and Break-in info."
In response to Reply # 4


          

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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