Subject	Any dampener on the crank is going to sink power from the
Posted by	Ash's Z on November 19, 2013 at 1:57 PM
	This message has been viewed 350 times.
In Reply To	ATI supers protect again engine vibration up to 10k rpm... posted by TTZ2NV(EPTmotorsports) on November 19, 2013 at 12:25 PM
Message	rotating group and shed it in the form of heat - i.e. parasitic losses. Dampeners are always going to be heavier than a billet aluminum pulley so add in inertial losses as well with the dampening units. Dampening units are also larger in diameter on the pulley faces so there is additional parasitic losses due to driving the accessories. These losses are rather small but the main question is if they are necessary at all. FWIW, I've spun my motor in the 10KRPM range a couple of times without issue with the UR pulley. Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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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