getting *no* compression on a j-spec
05-26-02, 04:59 PM
#1
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getting *no* compression on a j-spec
I got a j-spec engine recently and am trying to run the sucker now. Only problem is, it doesn't seem to be getting ANY compression at all. I tried a compression tester in the lower plugs of both rotors and watched it, nothing. HOWERVER.. this engine WAS compression tested before it was shipped to me. Is it possible that the ATF trick would completely solve this problem? I'm getting really really really really really pissed off right now, becuase I've spent a lot of friggin' hours getting this swap done, and if this mother doesn't run, I'm going to make some heads roll.
05-26-02, 05:04 PM
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well, some of my friends have purchased j spec motors, that have had no compression, they tried the atf trick, and for some it didn't work. They took off the turbo and manifold and looked in with a flashlight to notice an apex seal broken, and stuck in the side of the rotor, scaring the housing beyound repair,
Try the atf, and then try removing the turbo and man.
Try the atf, and then try removing the turbo and man.
05-26-02, 05:29 PM
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well that sounds promising.. *(%#ing bastards, I hate this.. I'm NEVER doing this again.. I'm paying some bastard to pull the engine, rebuild/port it, and reinstall/tune it from now on.
05-26-02, 05:47 PM
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Originally posted by SilverT2
Tear the j-spec apart and rebuild it!!!
Tear the j-spec apart and rebuild it!!!
Some of you will catch that later..
Anyhow, so what's the consensus here, think the ATF will work, I guess I'll find out tomorrow. I just put it in at about 6:00 EDT, will there be any real problems with trying it tomorrow around noon, or should I REALLY wait those extra 6 hours? I'd like to get this bastard going ASAP, it's been pissing me off long enough.
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05-26-02, 06:36 PM
#10
My friend revived a junkyard engine by squirting some motor oil thru the leading plug hole. He got it on all 3 faces of the rotor and cranked the engine right away. The engine regained compression and ran like new. Perfect compression all around.
05-26-02, 06:48 PM
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I would really like to know whare you got it from. I wouldn't trust a motor that suddenly got it's compression back from puting some fluid into it. I would return that motor asap so your warrenty doesn't expire
05-26-02, 08:23 PM
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did you buy the engine on ebay? If so, compression test means nothing on there. SR20DET guys can tell you that!
When they say the engine is "compression tested", it doesn't mean it has compression. It just means that compression test was performed, not that it passed the compression test.
Looks like you ripped!
Oh well, let that be a lesson for us.
Even if you used the ATF trick, it might raise the compression slightly, enough for it to run. the trick would not raise the compression back to stock spec.
When they say the engine is "compression tested", it doesn't mean it has compression. It just means that compression test was performed, not that it passed the compression test.
Looks like you ripped!
Oh well, let that be a lesson for us.
Even if you used the ATF trick, it might raise the compression slightly, enough for it to run. the trick would not raise the compression back to stock spec.
05-26-02, 09:05 PM
#16
I had a good experience installing a Jspec engine in my FD. I got my engine with a guarantee to start from a Jspec engine distributor in California. His name is Derek and he's been pretty good with jspec rotaries (13BREW and 20B).
Your buddy who "solved the compression loss" with ATF may have tested the compression incorrectly. If you have no compression due to seal failure, ATF MAY help get the engine started for a brief period of time. That brief period of time is dependent on seal damage (completely broken versus seal wear).
J
Your buddy who "solved the compression loss" with ATF may have tested the compression incorrectly. If you have no compression due to seal failure, ATF MAY help get the engine started for a brief period of time. That brief period of time is dependent on seal damage (completely broken versus seal wear).
J
05-26-02, 09:06 PM
#17
Take the car to a reputable rotary mechanic if you're still having trouble.
Make sure you contact jspec engine seller and work out some sort of reimbursement. Note: don't go off angry on the seller or you might get nothing out of the seller.
Good luck!
J
Make sure you contact jspec engine seller and work out some sort of reimbursement. Note: don't go off angry on the seller or you might get nothing out of the seller.
Good luck!
J
05-26-02, 09:45 PM
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I got it from Midwest Engine in Cleveland. I'm from there, and they do lots of all kinds of engines, Ima have to call 'em if this doesn't work out, we'll see.
And I saw the compression test it had before, it loooked good
And I saw the compression test it had before, it loooked good
05-27-02, 10:40 PM
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no, I took the compression tester and finger tightened it into the old motor on the "good" rotor and spun it by hand, and the sucker blew 30 psi just spinning it by hand.
Besides, I put the plugs in it and it didn't want to stop when I spun it by hand, but the old motor (with one good rotor) wanted to stop a lot more than the "new good" motor.
Besides, I put the plugs in it and it didn't want to stop when I spun it by hand, but the old motor (with one good rotor) wanted to stop a lot more than the "new good" motor.
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