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Compression And Boost

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Old 07-29-2003, 12:34 AM
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Is it advisable to use higher than 9:1 compression rotors when building an engine with a goal of 450 fwhp? I cannot find 9:1 rotors for any sort of decent price. The 9.4 and 9.7's seem a dime a dozen, however.



Also, and further relating this thread to this forum, how would my compression selection affect my turbo selection? ie, If I am limited to running less than 15psi (hypothetical guess) because of the higher compression, should I bother looking at the GT35/40 if I need to push 20psi in order to generate the numbers that I want?
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Old 07-29-2003, 12:48 AM
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FWHP?? Not sure why you would need to go with higher compression rotors anyways. If you want more power turn up the boost and add race fuel.
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Old 07-29-2003, 01:00 AM
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Tulsa, hehe. My dad gave me a burned copy of some new Roy D. Mercer!



Anyway, I would like something that is more for Auto-X, stoplight drags, cruising, etc. rather than out and out hp. All I have now are the s4 8.5:1 slugs. I would like to upgrade to something lighter with a bit more compression. FD rotors would be ideal, but all I have managed to find are 9.4 and 9.7:1 N/A rotors. So, I am considering my options if I choose, say, the 9.4:1 rotors.



edit:"FWHP?" Fly-Wheel Horse Power
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Old 07-29-2003, 01:03 AM
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Have you thought about going with FD lightened rotors?
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Old 07-29-2003, 01:13 AM
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Originally Posted by 94touring' date='Jul 29 2003, 12:48 AM
FWHP?? Not sure why you would need to go with higher compression rotors anyways. If you want more power turn up the boost and add race fuel.
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Old 07-29-2003, 04:04 AM
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what's wrong with the 8.5:1? so you can't rev to 10k...but you can sure as hell boost the **** out of it.
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Old 07-29-2003, 08:32 AM
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Originally Posted by jspecracer7' date='Jul 29 2003, 06:04 PM
what's wrong with the 8.5:1? so you can't rev to 10k...but you can sure as hell boost the **** out of it.
Van, you know better than that. The motor that was in Scott's red FC had zenki 8.5 rotors(read 12,000 consistently).
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Old 07-29-2003, 09:27 AM
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Originally Posted by IGY' date='Jul 29 2003, 09:32 AM
Van, you know better than that. The motor that was in Scott's red FC had zenki 8.5 rotors(read 12,000 consistently).
12,000 RPM?
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Old 07-29-2003, 11:32 AM
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Originally Posted by jspecracer7' date='Jul 29 2003, 01:04 AM
what's wrong with the 8.5:1? so you can't rev to 10k...but you can sure as hell boost the **** out of it.
they were revving the 74-85 12lbs 13b rotors to 12,000 rpm in the 80's
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Old 07-29-2003, 01:42 PM
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Originally Posted by jspecracer7' date='Jul 29 2003, 04:04 AM
what's wrong with the 8.5:1? so you can't rev to 10k...but you can sure as hell boost the **** out of it.
I was thinking that really!!!
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