Subject	Wheel mass -> torque loss?
Posted by	Bezza on December 11, 2007 at 10:56 AM
	This message has been viewed 207 times.
Message	I was reading through a previous post entitled wheel and tire 101 and it is mentioned that heavier wheels have a greater rotational intertia, I would like to know the approximate magnitude of the effect. Does anyone know of a wheel mass to torque loss calculator? Once the mass of the wheel is known, and a distribution of mass is assumed for the wheel, it should be possible to calculate how much torque is lost by having a heavier wheel. Please correct me if wrong, but the most difficult/error prone step in doing this is assuming a value for the distribution of wheel mass? This would be very useful info to have when deciding where to spend hard earned cash.
Follow Ups	Wheel mass -> torque loss? - Bezza 10:56:09 12/11/07 I can't give you numbers, but the greatest rotational - robo (sebring1970) 11:08:00 12/11/07 interesting - Bezza 11:32:23 12/11/07 not just acceleration, but handling as well. - MixManMash 11:50:11 12/11/07 good info - Bezza 12:07:38 12/11/07 yeah. If it's not there, it's probably on Probetalk.com. (n/m) - MixManMash 12:28:01 12/11/07 lol, I did not see yur post before I posted mine. I was - robo (sebring1970) 12:08:07 12/11/07 It's all good. (n/m) - MixManMash 12:23:29 12/11/07 and not just accereration, handling too. heavier rotating - robo (sebring1970) 11:59:27 12/11/07 Where's a Mechanical Engineer when you need 'em? ZEngineer? - MixManMash 12:05:42 12/11/07 I wouldn't exactly trust his word on it. - Kenny 12:19:28 12/11/07 Must have missed that post. - MixManMash 12:24:10 12/11/07 LoL! (n/m) - Spongerider :) 16:02:37 12/11/07 The formulas are available online, this is basic kinematics. - Kenny 12:27:53 12/11/07 First of all, you're using made-up words like *kinematics.* - robo (sebring1970) 12:51:59 12/11/07 That's the catch... - Kenny 13:19:33 12/11/07 Bezza below is disagreeing with you. (n/m) - robo (sebring1970) 13:25:09 12/11/07 No, he isn't. - Kenny 14:11:43 12/11/07 He is pointing out that the steering torque on the wheels - robo (sebring1970) 14:44:36 12/11/07 One more time, read it again. - Kenny 15:03:12 12/11/07 since you are the self-proclaimed expert, while I already - robo (sebring1970) 15:42:21 12/11/07 If I were an expert, I'd know the *correct* definition of... - Kenny 16:01:57 12/11/07 "self-proclaimed expert" Kenny = know-it-all (n/m) - AZHeat 16:02:11 12/11/07 I don't doubt that it is correct consider them together - Bezza 15:43:50 12/11/07 *Kennymatics (n/m) - Z_Cherub 13:37:05 12/11/07 *KennyMatics* (n/m) - AZHeat 13:39:16 12/11/07 echo echo echo (n/m) - inf 13:59:27 12/11/07 "Hooked on Kennymatics" - eriksu9 15:51:35 12/11/07 Re: The formulas are available online, this is basic kinemat - Bezza 13:11:40 12/11/07 Don't you mean it's kinetics? There are forces/dynamics - MixManMash 15:29:54 12/11/07 I was going to point that out to him, but I bit my tongue. - robo (sebring1970) 15:44:24 12/11/07 I thought kinematics took mass into account. - Kenny 15:58:11 12/11/07 Ladies and Gentleman, we have an historic moment - AZHeat 16:05:41 12/11/07 Oh, he's wrong many times. This time he admitted it. - ZCulture 16:20:39 12/11/07 Why would I delete it? - Kenny 16:52:12 12/11/07 I'll admit if I'm convinced. - ZCulture 17:16:54 12/11/07 The fallacy of your claim is your shift-time variable - Kenny 17:41:15 12/11/07 #1. No one can shift a Z in 100ms. - ZCulture 18:17:15 12/11/07 What about a road course?? - Bezza 18:33:33 12/11/07 #1. Plenty can within 300 ms. - Kenny 18:52:39 12/11/07 Where is your source for your 300ms? Do you pull these - AZHeat 23:19:31 12/11/07 Kenny-Wanna-be-engineer debating with an engineer, classic (n/m) - AZHeat 18:42:29 12/11/07 Well, I do have an engineering degree. - Kenny 08:47:16 12/12/07 Demand a refund from the school. (n/m) - AZHeat 10:49:43 12/12/07 Full academic scholarship, I didn't pay a dime ;). - Kenny 13:58:53 12/12/07 Oh come on. - PennStateZ 00:35:39 12/13/07 lmao (n/m) - Kenny 08:23:07 12/13/07 *Gentlemen (n/m) - aliaZ 16:47:44 12/11/07 *a historic moment - SeedyROM 16:54:06 12/11/07 It's all good. We're all here to learn, share, and discuss, - MixManMash 16:19:26 12/11/07 <3 (n/m) - Kenny 17:06:08 12/11/07 echo echo echo (n/m) - inf 13:59:41 12/11/07 ............... - Z_Cherub 14:42:41 12/11/07 Approximate magnitude - ZCulture 13:17:10 12/11/07 sweet thanks. (n/m) - Bezza 15:58:20 12/11/07 Luke at tirerack told me that every extra 5 lbs per wheel - jmw23712 13:36:23 12/11/07 I'd imagine it more of an issue from a 5-60 street start. - Scotts94z32 15:08:43 12/11/07 Don't forget the effect it will have on braking. - not-hrz 14:44:38 12/11/07 Re: Wheel mass -> torque loss? - dTb 16:32:36 12/11/07 so, regarding steering, the friction force is greater than - robo (sebring1970) 07:33:02 12/12/07 Re: so, regarding steering, the friction force is greater th - dTb 18:14:23 12/12/07 you just brought braking into it. I was talking about - robo (sebring1970) 05:47:38 12/13/07 Re: you just brought braking into it. I was talking about - dTb 17:29:40 12/13/07 roger, that. thanks for the input. (n/m) - robo (sebring1970) 00:00:00 12/14/07
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