Subject	Doubtful, cracks start on the OD of a shaft and propagate
Posted by	LitlElvis on December 21, 2009 at 11:16 AM
	This message has been viewed 56 times.
In Reply To	Can the crank actually crack like that? (n/m) posted by MeatMan - 604Z.ca - on December 21, 2009 at 10:01 AM
Message	to the ID. When a shaft is flexed, the stresses are highest on the outer surface and near zero the closer you get to the center. If those are cracks, your crankshaft would already be in multiple pieces. My bet is it's some old grease that has simply dried out and cracked from shrinkage.
Follow Ups	RPS Max series 6 puck clutch Fubar'd after 3000 miles! - MeatMan - 604Z.ca - 22:12:08 12/20/09 Did you install it right, adjustments and bleed the clutch - Nostype2 22:22:26 12/20/09 I did all you mentioned, the pedal travel was ~ 1" before - MeatMan - 604Z.ca - 22:33:16 12/20/09 Why would you use an aluminum flywheel for drag racing? (n/m) - Bernie (NoVA) 22:28:48 12/20/09 It was on the car when I bought it..... - MeatMan - 604Z.ca - 22:34:50 12/20/09 IMHO aluminum flywheels are not appropriate for that - Bernie (NoVA) 22:36:26 12/20/09 Why do so many people use them then? - MeatMan - 604Z.ca - 23:09:20 12/20/09 Light flywheels tend to beat up clutches when launching - Bernie (NoVA) 23:38:03 12/20/09 yup. what he said ^ (n/m) - ForceFedTT (SoCal) 03:03:22 12/21/09 Probably has to do with the limited ability for the friction - Ash's Z 05:57:30 12/21/09 The solid insert flywheels will warp quickly......... - Greg D. (Specialty-Z) 14:04:51 12/21/09 Also the stock flywheel is heavier then the rps - dream Z (MD) 10:16:01 12/22/09 cuz they dont use them for drag race and 30 hard launches yo (n/m) - zyoulater 04:06:50 12/21/09 One major reason is they are too light which = low inertia - LitlElvis 11:08:11 12/21/09 Re: Why do so many people use them then? - Greg D. (Specialty-Z) 13:50:16 12/21/09 Is that a pilot bushing behind the needle bearing? (n/m) - Eric(NJ) 22:33:00 12/20/09 I'm hoping its just grease. (n/m) - Bernie (NoVA) 22:35:29 12/20/09 The needle bearing was also installed when I bought the car. - MeatMan - 604Z.ca - 23:12:04 12/20/09 Looks like cracks :( (n/m) - Woody75 (Denver) 09:33:51 12/21/09 Can the crank actually crack like that? (n/m) - MeatMan - 604Z.ca - 10:01:24 12/21/09 Doubtful, cracks start on the OD of a shaft and propagate - LitlElvis 11:16:33 12/21/09 I was thinking cracks in the stock bushing, not the crank. (n/m) - Woody75 (Denver) 12:26:24 12/21/09 Re: RPS Max series 6 puck clutch Fubar'd after 3000 miles! - CmyZ 23:35:09 12/20/09 looks like a left foot problem (n/m) - Adam (NoVA) 04:39:42 12/21/09 Looks like it has been subjected to excessive slipping - Ash's Z 05:20:53 12/21/09 I had thougt I had adjusted the cluthe properly... - MeatMan - 604Z.ca - 10:00:00 12/21/09 That makes more sense........ - Greg D. (Specialty-Z) 10:44:09 12/21/09 A little reality check............. - Greg D. (Specialty-Z) 10:38:43 12/21/09 and there you have it (n/m) - zgene4 11:12:08 12/21/09 Very helpfull post...thanks. (n/m) - Wright (Ca) 12:07:26 12/21/09 Thanks for the Info everyone, very helpfull. (n/m) - mscurfield 19:34:48 12/22/09 I had about 20 or 25 low 1.6 60ft and 15,000 miles on my - dream Z (MD) 10:11:46 12/22/09 Curios here, how were you making 12psi of boost at launch? - Ash's Z 11:16:16 12/22/09 Josh has Racelogic Traction control with boost launch - mscurfield 19:30:22 12/22/09 Just about right, I have the Techtom IIC-460. - MeatMan - 604Z.ca - 22:26:34 12/22/09
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