Subject	the new ARP L19 hardware...
Posted by	KongZTT GT28RS MD on April 07, 2010 at 1:54 AM
	This message has been viewed 212 times.
In Reply To	All fasteners stretch when preloaded, the key is to not posted by LitlElvis on April 06, 2010 at 11:56 AM
Message	How do the washer sizes compare to the stock bolts?. I remember seeing things about some ARP fasteners having smaller than stock head bolt washers and it caused "sinking" of the fasteners on the soft aluminum heads.. Do you know if the older ARP hardware have smaller washers and have this issue? I just dont need ANY issues with heads lifting, even though I will not be close the normal numbers of that issue happening.. However; I do plan on running a 150 shot of n20 on top of a max boost of ~28psi. NO, This picture is not photoshopped. It took many times to take this picture. Setting up the timer, shutter speed etc, then jumping on my bike and getting the tire to spin. MySpace for those who have em' AIM:Shawn300zxTT "-Any closeups on the nuts? - zboost(tx) 19:17:53 08/08/05 -Not really something you want to ask another man about... (n/m) - LordZ 19:24:00 08/08/05" "I just took 45 min and scrubbed the heck out of my rear" teambushido(San Diego, CA) 19:24:51 12/11/04 -1991 Stage _ TT 5spd (Upgraded to hell and back) -1990 Super White 2+2 Na Stage 3 Auto (Daily Driver, contemplating selling.. ) -1990 Cherry Red Pearl ,Auto Coupe (Parts car) -1990 11 Sec Eagle Talon Tsi AWD, (SOLD!) -1996 Hyundai Sonata (Given to me for FREE , due to broken timing belt,bent valves.. fixed it myself and its my new DD that gets over 25 mpg! -2004 Honda CBR 600RR (Candy blue, FOR SALE)
Follow Ups	Stock head bolt tensile tests >>> - LitlElvis 17:19:23 04/05/10 have you tested the replace ARP studs for reference? - Carlos Ramirez 17:37:15 04/05/10 ARP lists their standard 8740 studs to be 200ksi - LitlElvis 17:47:04 04/05/10 Interesting... - Gold300zx 17:38:36 04/05/10 I'm curious, was the breakpoint at the nut, or does it have - zellamay 17:53:55 04/05/10 it's more to do with the start of the threads - LitlElvis 21:37:58 04/05/10 To clarify, if the threaded portion was longer, and the - zellamay 21:59:16 04/05/10 it will break where the threads start to form on the shank - LitlElvis 22:05:54 04/05/10 Thanks, you have been very informative. (n/m) - zellamay 23:14:59 04/05/10 So the bolts dont really stretch? Just break.... (n/m) - ZXoltan 18:37:31 04/05/10 Yes they stretch - Brad(RI) 18:53:41 04/05/10 The threads are rolled. Like you, I hoped this would - LitlElvis 07:54:18 04/06/10 Out of curiosity... - Obeeone 19:13:36 04/05/10 Re: Out of curiosity... - Brett@AwesomeZ 19:31:20 04/05/10 Re: Re: Out of curiosity... - Brett@AwesomeZ 19:32:30 04/05/10 The graphs and some math tell the tale that you want to see - LitlElvis 22:03:39 04/05/10 This is not about outright failure of head bolts - LitlElvis 21:50:30 04/05/10 Never seen one issue with the factory head bolts yet (n/m) - Seb@Specialty-Z 22:36:43 04/05/10 Seb, what's the highest HP you have run with stock bolts? (n/m) - ZXoltan 07:45:11 04/06/10 a little over 1000 BHP (n/m) - Seb@Specialty-Z 10:12:31 04/06/10 Do you guys recommend the stock head gaskets or MLS styles? - KongZTT GT28RS MD 01:48:13 04/07/10 Exactly, it's not about breaking bolts - Brett@AwesomeZ 00:44:29 04/06/10 typically, fasteners are preloaded to 75% of yield strength - LitlElvis 07:16:53 04/06/10 I thought stock head bolts fell into this stretch category. (n/m) - Antihero 08:36:50 04/06/10 All fasteners stretch when preloaded, the key is to not - LitlElvis 11:56:01 04/06/10 the new ARP L19 hardware... - KongZTT GT28RS MD 01:54:07 04/07/10 You have an instron in your shop? Impressive! (n/m) - Scotts94z32 11:44:26 04/06/10 It's not mine, I just get access to it :-) (n/m) - LitlElvis 12:07:25 04/06/10 What adjustment factor do you apply to the steel>> - ZUL8TR 14:37:31 04/06/10 This is perfect.. I have been thinking of pulling - KongZTT GT28RS MD 01:41:27 04/07/10 err.. L19 (n/m) - KongZTT GT28RS MD 01:46:06 04/07/10
Post a Followup	You cannot reply to this message because you are not logged in.