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Forum namePerformance/Engine
Topic subjectCompression Test Not Looking Good =(
Topic URLhttps://forums.2gnt.com/dcboard.php?az=show_topic&forum=i5&topic_id=70920
70920, Compression Test Not Looking Good =(
Posted by EclipseRST, Mar-17-04 12:41 PM
Alright guys, just did a compression test on my stock motor. Here's the results...

Cyl 1 - 190

Cyl 2 - 210

Cyl 3 - 180

Cyl 4 - 200

They're all over the place and I'm pretty concerned about the 210-180 difference. Does this require immediate attention or am I alright? x(
70921, RE: Compression Test Not Looking Good =(
Posted by Super20G, Mar-17-04 12:46 PM
that's not too bad.. i've seen worst. I would keep an eye on it more frequently now, and start saving to rebuild before too long.
70927, RE: Compression Test Not Looking Good =(
Posted by EclipseRST, Mar-17-04 01:30 PM
Well I'd really like to open up my car now that it's going to be intercooled (we're installing my HRC SMIC right now) so is it alright to run it hard as long as I do frequent tests and watch it?
70928, RE: Compression Test Not Looking Good =(
Posted by Super20G, Mar-17-04 02:40 PM
as long as the engine is tuned pretty decent.... those numbers really arent too bad if you ask me... maby someone else will bitchslap me for saying that... but i would just keep an eye on it and see what kind of a trend your seeing over time.
70938, RE: Compression Test Not Looking Good =(
Posted by EclipseRST, Mar-17-04 07:02 PM
Thanks for the replies man. Anyone else?
70939, RE: Compression Test Not Looking Good =(
Posted by DarkOne, Mar-17-04 07:17 PM
Looks fine to me.

Of course, i have very lax standards. If it were me, it could be 150-190-210-180 and i'd probably still drive it and not care.
70944, RE: Compression Test Not Looking Good =(
Posted by EclipseRST, Mar-18-04 03:46 AM
Originally posted by DarkOne
Looks fine to me. Of course, i have very lax standards. If it were me, it could be 150-190-210-180 and i'd probably still drive it and not care.


But you have the tools and know-how to rebuild it in 1 hour and have it back on the rode. ;)

I'm a poor college student and if this thing pops and I don't have all of the cash handy then it's getting parted out or sold.

Thanks guys, I appreciate it. :thumbsup
70947, RE: Compression Test Not Looking Good =(
Posted by DR1665, Mar-18-04 04:20 AM
Originally posted by DarkOne
Looks fine to me. Of course, i have very lax standards. If it were me, it could be 150-190-210-180 and i'd probably still drive it and not care.


Glad to hear that, considering my 10.5:1 rebuild is netting my can't-install-piston-rings-for-shit-ass 190s across the board. :| Drive it till it drops imo. :thumbsup
EDIT:
or until you're switching out the old head for a built one and can install some Total Seals then since you're lazy and don't feel like pulling the engine twice a year.
70956, RE: Compression Test Not Looking Good =(
Posted by eclipse_99rs, Mar-18-04 07:28 AM
those numbers are good. Dont worry about it. By the time that shit blows you'll prolly be outa school :thumbsup
70960, RE: Compression Test Not Looking Good =(
Posted by admin3, Mar-18-04 08:13 AM
Originally posted by DarkOne
Looks fine to me. Of course, i have very lax standards. If it were me, it could be 150-190-210-180 and i'd probably still drive it and not care.


hahahah....that's my thoughts exactly. I could give two shits about the whole theory with respect to needing no more than a 10-15% variance from cylinder to cylinder.

My theory is, if it cylinder in our 420a's is better than 150 or so, it's all good. Whether cylinder #1 says 150 and #4 is 224, or they're 180 across.

71045, RE: Compression Test Not Looking Good =(
Posted by xtrickedeclipsex, Mar-19-04 03:41 PM
yea trust me, those numbers a FINE....as long as there not dropping low like below 160, who cares about the 15% diffrence shit...your numbers are all high just becuase there not super even....there great...try doing it again on a diffrent day, i did and got better number, the motor was nice and hot...try it