Subject	Re: I would think it would have the same effect as lightening
Posted by	J4Play on January 24, 2005 at 5:04 AM
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In Reply To	I would think it would have the same effect as lightening posted by robo (sebring1970) on January 24, 2005 at 04:21 AM
Message	actually i don't think you will get any gains anywhere. please correct me if i'm wrong on any of the following. carbon fibre unit is 13 pounds, stock unit is 27 pounds (1). also, carbon fibre unit is hollow while stock is solid (2). Moment of inertia for a solid cylinder is 1/3*M*R*R, while for a hollow cylinder is M*R*R (3). Therefore they both have pretty much the same moment of inertia (CF may even have higher MOI), and there will be no HP gains to be had. :up other parts of the drivetrain (flywheel, crank pulley). You don't get more HP, but you get more available horsepower, or you get to that HP a little quicker. The area under the curve of a dyno chart might increase a bit but the peak would be the same.
Follow Ups	Any dyno proven HP gains from a carbon driveshaft? - ZisLuv 02:57:21 01/24/05 I would think it would have the same effect as lightening - robo (sebring1970) 04:21:03 01/24/05 Re: I would think it would have the same effect as lightening - J4Play 05:04:56 01/24/05 I dunno, I said there would be no gains in peak HP. - robo (sebring1970) 06:00:41 01/24/05 Re: I dunno, I said there would be no gains in peak HP. - J4Play 06:20:31 01/24/05 the stock drive shaft isn't a solid cylinder (n/m) - CarlCuro 10:21:36 01/24/05 That's some light steel! - Marshall 11:22:43 01/24/05 Re: That's some light steel! - J4Play 17:26:32 01/24/05 that depends - aliaZ 07:40:40 01/24/05 If you dyno at the wheels you should get more horsepower - just4kinks 08:01:22 01/24/05 well said (n/m) - aliaZ 08:46:11 01/24/05 the force is strong with this one ;c) (n/m) - robo (sebring1970) 08:58:39 01/24/05 I agree somewhat, but let me add something - Marshall 11:38:15 01/24/05 I see what you're saying about aluminum flywheels - aliaZ 11:58:07 01/24/05 I agree completely... - just4kinks 13:01:54 01/24/05 2nd, more area under the curve, not more peak (n/m) - turtleboy 08:43:58 01/24/05 this makes 0 sense.. - AntiHero 13:53:20 01/24/05 Re: this makes 0 sense.. - J4Play 16:45:31 01/24/05 My reasoning being, since it's lighter, it takes less force - turtleboy 23:21:42 01/24/05 i see where you're coming from. - J4Play 02:48:16 01/25/05 what if the flywheel weighed 200lbs instead of 27lbs ? - ScubaSteve 12:49:04 01/24/05 I'm not so sure. Your argument sounds specious to me. - robo (sebring1970) 23:02:15 01/24/05 yes but the time it takes is - J4Play 03:56:47 01/25/05 true, if you're measuring power, but how does that - robo (sebring1970) 06:24:50 01/25/05 how long it takes to reach a certain RPM will be a - J4Play 07:43:19 01/25/05 but how is what you describe represented on a dyno chart? (n/m) - robo (sebring1970) 17:42:37 01/25/05 how else is torque measured on an intertial dyno? - maglito 01:05:56 01/26/05 no, you would have lower peak HP/TQ also. Because ... - ScubaSteve 09:39:16 01/25/05 yeah, more energy to START a heavier object turning, - robo (sebring1970) 17:45:43 01/25/05 i still havent seen a comparison between oem and others - Chris(NJ) 06:47:40 01/24/05 yes. search for my post from 4-5 years ago regarding the CF - Bernie (OOParts International) 15:34:04 01/24/05
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