Subject	Re: Hard to say...
Posted by	aliaZ on November 19, 2013 at 12:10 PM
	This message has been viewed 408 times.
In Reply To	Hard to say... posted by Ash's Z on November 19, 2013 at 11:10 AM
Message	:I've been running with an UR pulley since mile zero, making some 678FWHP and 637FWTQ, rolled 83K miles the other day. :I went through a series of rod bearing replacements every 15K miles as rod bearing failures are the biggest weak point in these engines, however, after going to heaver weight oil and shimming the oil pump relief valve, I am no longer seeing the bearing wear that I was with the thinner oils. I am still running the UR pulley. Are you still running .0011 to .0012 rod clearances? Or did you open them up to something more reasonable? If you're running the OEM oil cooler bypass setup, shimming the oil pump PRV won't gain you anything because the oil system will start diverting flow to the oil cooler past 45 psi.
Follow Ups	Does ATI Damper help engine longevity < 500 hp ? - ZXoltan 07:55:12 11/19/13 Re: Does ATI Damper help engine longevity < 500 hp ? - Bigwill837 08:58:51 11/19/13 Respectfully I disagree.... - Madhatter10-6 09:21:39 11/19/13 Well of course they will tell you that. - The Hawk 09:41:02 11/19/13 Maybe.... - Madhatter10-6 09:48:26 11/19/13 has anyone ever lost an engine here due to undampened - LJZTT 10:04:33 11/19/13 To be honest, I haven't seen anyone lose a VG30DE(TT) due to - MixManMash 10:19:43 11/19/13 I haven't either but I wouldn't be surprised if the ati - Evan_Wright (Ca) 10:26:27 11/19/13 I'm not questioning any of that at all - LJZTT 10:39:59 11/19/13 I went back to stock on my current engine and I feel better- - ZinnZ32 10:31:15 11/19/13 I think that is being paranoid, which I can totally identify - LJZTT 10:46:22 11/19/13 This somewhat get to the heart of my inquiry - ZXoltan 11:24:16 11/19/13 I agree with all the theories, however... - ZinnZ32 11:26:08 11/19/13 I also agree that it is a 'cumulative' thing - ZinnZ32 11:32:20 11/19/13 actually I would say we have a pretty good data pool - LJZTT 17:19:06 11/19/13 yeah same here I opted for the stock pulley for my build. (n/m) - Jiro 19:19:53 11/19/13 is the stock pulley also a dampener? (n/m) - LJZTT 19:54:24 11/19/13 meant stock harmonic balancer (n/m) - Jiro 01:29:32 11/20/13 what's the difference? (n/m) - LJZTT 15:13:22 11/20/13 Nothing - -Grimm- 16:09:50 11/20/13 hard to say - aliaZ 11:38:06 11/19/13 Was there a definite answer to that crank failure? - rcmadness 13:05:11 11/19/13 If I was building a 1000hp monster I wouldnt be asking - ZXoltan 13:35:58 11/19/13 At that power level I'd think you have a few ponies to - Ash's Z 14:04:22 11/19/13 Yep. My point exactly. - ZXoltan 14:28:11 11/19/13 Exactly. - Ashman2k2 21:19:07 11/19/13 interesting point, although I didn't think there was THAT - LJZTT 15:23:18 11/20/13 You're saying there haven't been motor design improvements.. - -Grimm- 16:10:58 11/20/13 Not saying, more asking. Has the last 20 (not 30) years - LJZTT 17:23:51 11/20/13 There is in the cylinder head. (n/m) - michaell32 (FL) 21:43:12 11/20/13 Well said. - Bigwill837 10:03:11 11/19/13 Speculation. - Antihero 12:09:54 11/19/13 Hard to say... - Ash's Z 11:10:15 11/19/13 Nail - Head... You are on it. Well said (n/m) - ZinnZ32 11:35:18 11/19/13 The thing is, the dampers are primarily in place to protect - Ash's Z 11:56:18 11/19/13 Re: Hard to say... - aliaZ 12:10:19 11/19/13 >>> - Ash's Z 12:22:33 11/19/13 Don't you just love tribology! - Ashman2k2 19:30:38 11/19/13 Re: Don't you just love tribology! - Ash's Z 13:14:02 11/20/13 ATI supers protect again engine vibration up to 10k rpm... - TTZ2NV(EPTmotorsports) 12:25:06 11/19/13 Any dampener on the crank is going to sink power from the - Ash's Z 13:57:35 11/19/13 Ive not seen anyone needing to replace bearings so often. - LivinTheDream 18:46:10 11/19/13 How about reduction in driveline chatter? - BlackholeZ 15:12:02 11/19/13 Probably more a function of clutch and flywheel (n/m) - ZXoltan 16:30:43 11/19/13 I'd say you need a sprung clutch disk - aliaZ 18:17:15 11/19/13 Yeah, I do. I'm thinking of going back to a stock flywheel - BlackholeZ 11:54:35 11/20/13 None dampened UD pulleys and bearing wear... - Matt P. 20:06:09 11/19/13 Agree, don't like them, don't recommend them and - CmyZ 20:42:24 11/19/13 My front main bearing was worn on the top from the belts - -Grimm- 16:07:55 11/20/13 yes, it is still an issue with stock.. - Matt P. 11:31:27 11/21/13 Not to hijack or anything.... - quikz 21:11:52 11/20/13 they only really big issue we have had to ... - Matt P. 11:44:23 11/21/13
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