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Porting And Apex Seals

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Old 09-11-2003, 01:57 AM
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I tuned my engine to 9.5k rpms
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Old 09-11-2003, 02:33 AM
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Originally Posted by jspecracer7' date='Sep 11 2003, 06:57 AM
I tuned my engine to 9.5k rpms
what are the specs on your engine?
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Old 09-11-2003, 03:16 AM
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13B-rew with 2mm 2 piece atkins apex seals. everything else is stock except for the magic fairy dust I sprinkle in the engine before starting.
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Old 09-11-2003, 03:32 AM
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Originally Posted by jspecracer7' date='Sep 11 2003, 08:16 AM
13B-rew with 2mm 2 piece atkins apex seals. everything else is stock except for the magic fairy dust I sprinkle in the engine before starting.
no extra balancing or anything was done before assembly?
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Old 09-11-2003, 04:28 AM
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Originally Posted by pengaru' date='Sep 11 2003, 05:32 PM
no extra balancing or anything was done before assembly?
none. I have never had problems with the engine...just tuning errors. I've blow 2 motors. My first one I accidentally swapped the trailing front with the trailing rear coils...needless to say...It cracked all the apex seals on the top Then my second motor, I boosted 2.6 kilos...but was tuned to .8 kilos ...



I've been revving to 9.5k forever...I know that IGY and Dragon do the same thing. Never had problems with apex seals floating.
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Old 09-11-2003, 06:02 AM
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Originally Posted by jspecracer7' date='Sep 11 2003, 09:28 AM
none. I have never had problems with the engine...just tuning errors. I've blow 2 motors. My first one I accidentally swapped the trailing front with the trailing rear coils...needless to say...It cracked all the apex seals on the top Then my second motor, I boosted 2.6 kilos...but was tuned to .8 kilos ...



I've been revving to 9.5k forever...I know that IGY and Dragon do the same thing. Never had problems with apex seals floating.
interesting, thanks for the input. I queried mazdatrix on the subject back when I was building my engine, so alot of my #'s have been based on their information.



i'm going to start looking into an engine dyno.
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Old 09-11-2003, 10:32 PM
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Ive heard that S4 motors should not be revved too high because of the flywheel, is there any truth to this?
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Old 09-11-2003, 10:39 PM
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i dunno but i hate my flywheel with a passion!
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Old 09-11-2003, 10:39 PM
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Yes. Just look at an S4 flywheel and imagine the centrifical force on all that metal as it spins past 8000 rpm.
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Old 09-11-2003, 10:56 PM
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what if you have a lightened fw? Will it make a difference then?
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