2nd Generation Specific 1986-1992 Discussion

2mm Or 3mm

Old 06-01-2004, 06:07 PM
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I am in the middle of doing a TII conversion on my Na Rx7. and while the motor is out i am having it rebuilt and having a stage III street port done on it. i am also doing a T66 turbo upgrade and thats all i can tell you without letting the cat out of the bag. i am in the middle of a debate that has me baffeled. I need to decide if i wanna go with 2mm cryo-hardened seals or 3mm cryo-hardened seals. or should i go for the aviation seals. i am plannin on pushing 15-20 psi.



As far as the seals go i am clueless. i have heard that the 3mm seals dont seal as well as the 2mm seals, and the 3mm arnt good for daily drivng.



Any and all advice or comments welcome. i would like to hear what jim has to say.



TurboSmoke
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Old 06-01-2004, 09:36 PM
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go for the 2mm seals, they work better
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Old 06-01-2004, 09:50 PM
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Ive always been told and read that 2mm is better as well. Keep it factory with the apex seals (meaning 2mm ).



-Marc
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Old 06-01-2004, 09:52 PM
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apparently the aviation seal can withstand 3 pings. i'd go with them
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Old 06-01-2004, 09:54 PM
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I also read on rx7club people were having problems with premature wear with the RA seals.



http://www.rx7club.com/showthread.php?s=&t...rotary+aviation
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Old 06-01-2004, 09:56 PM
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Originally Posted by nismo convert' date='Jun 1 2004, 06:52 PM
apparently the aviation seal can withstand 3 pings. i'd go with them
so can the stock ones, just depends on when you ping
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Old 06-02-2004, 12:44 AM
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So are you going to cryo everything else in the motor?
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Old 06-02-2004, 12:50 AM
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I had a bad knock in mine with the 2mm seals drove it several times that way before I figured it out, it didn't kill them.



As far as the cryo treating I am just not sold on it yet, only time will tell.
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Old 06-02-2004, 07:11 AM
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Damn, someone elso cyroing thier engine.
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Old 06-02-2004, 01:34 PM
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i have 3 mm seals on mine, not sure of the material, just know it added to the cost of my rebuild two summers ago. since then, i've put 2 hard years on my car, complete with drag racing and some autox runs. they work fine, and i haven't had any complaints. i make good power, and the car runs strong and reliably.
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