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10-10-2001, 06:06 PM | #1 | |
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Roller-rockers?
Alright. I'm looking to purchase a JWT cam set and I need to know if I have roller-rocker cams or not.
It's a '96 P10.
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------------------------------------------------ 1996 P10(E) --- 17' Enkei RS6 205/40ZR-17 Yoko PARADA --- HS ColdAirIntake, w/ bypass valve GReddy MX Exhaust Hotshot Headers JWT S3 Cams Unorthodox full kit -anvanced spark plug timing -JWT ECU -and always on Premium, at least...heh |
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10-10-2001, 06:15 PM | #2 | ||
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Re: Roller-rockers?
Quote:
Your best bet would be the S3 cams.
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George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941 |
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10-11-2001, 12:26 AM | #3 | |
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Whats the diff between the S cams and C cams...and the diff between S3 and S4 cams?...
Does it matter between a high port or low port?
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10-11-2001, 06:58 AM | #4 | ||
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Quote:
They have had special valve springs made that raise the harmonics of the springs to keep them from floating - even with the aggressive C series cams. They are not much higher rate than stock (the common way of fighting valve float is to install high rate valve springs - sometimes not the best idea), but the key is the raised harmonics. Mike Kojima and Rob Cadle have gone into this in great detail on the SE-R Mailing List. The retainers are made of titanium since lower mass also helps to raise the harmonics of the valve train. The valve springs and retainers are so effect that they alone will add about 2 hp on and otherwise stock engine. The C series cams will make more hp than the S series.
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George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941 |
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10-11-2001, 09:22 AM | #5 | |
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I don't know if this is how JWT intended it but it makes sense.
S series = Street cams C series = Competition cams Then the higher the number the more aggressive they are. S series was intended for street cars and daily driving. The C series is intended for racing, have lumpy idle and narrow but high power band. I also thought that the C1 cams can be used with the stock springs and retainers but I don't know if they are outdated or not. |
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10-11-2001, 10:17 AM | #6 | |
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from what i've heard.. the C1 cams have a better idle than the S4 cams but also make more power.
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10-11-2001, 10:29 AM | #7 | |
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Thanks for the replys guys =)
Hey is there a big difference on the price of C and S cams?
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10-11-2001, 11:32 AM | #8 | |
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i think the c1's cost about twice as much as the s4's because the price includes the valve springs as well. i could be wrong though.
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