Subject	I'll take a stab at it
Posted by	DAYTONAZ on October 31, 2005 at 5:06 PM
	This message has been viewed 90 times.
In Reply To	Dee Ridgeway's rod bearing collection pictures >> posted by Ash's Z on October 30, 2005 at 08:50 PM
Message	Looking at the 2nd pic with the bearings lined up, it appears that upper bearing in each set has an unusual wear pattern different from the lower bearings to the right. I would attribute that to crankshaft balancing or lack there of. Maybe magnified by the introduction of a lightened flywheel later and the difference as noted by Dee. If you measure the width of the chamfered hole on the crank and then compare that to the unscalded portion of the broken bearing, it appears that the bearing was oil starved and overheated to the outside of the chamfered area where the oil supply was limited. This could be caused by the journal that wasn't machined and finished properly leaving a raised section towards the outsids of the journal. Since your hunch is there's possibly something going on with #4 you should follow it. How about having the injectors flow tested to see what they're doing? Call around and see if you can find a local shop that can test them. Just my .02
Follow Ups	Dee Ridgeway's rod bearing collection pictures >> - Ash's Z 20:50:26 10/30/05 meh? - Halo Z 21:27:34 10/30/05 What about it? (n/m) - Ash's Z 21:36:10 10/30/05 you don't think thats a possible cause? (n/m) - Spee 22:02:07 10/30/05 I haven't ruled out all the possibilities yet, and I haven't - Ash's Z 22:30:21 10/30/05 I'm going with 5) the overboost started it. - Spee 22:49:28 10/30/05 I'm sure the overboost didn't help. You raise a very good - Ash's Z 01:05:13 10/31/05 naw, it could be buffed right out.. - Halo Z 22:30:56 10/30/05 Ric, I would hope that you would realize that at this point - Ash's Z 22:39:38 10/30/05 i wish i had a "super ego" then i would put "HaloSpec" - Halo Z 22:44:03 10/30/05 I feel pretty confident that many others around here - Ash's Z 23:36:41 10/30/05 i see .. - Halo Z 22:11:33 10/30/05 I have already considered all of those points > - Ash's Z 03:22:11 10/31/05 i wouldnt rule the tune or the others - genic 08:44:03 10/31/05 There's gotta be an issue somewhere in the motor with - Ash's Z 11:23:20 10/31/05 That bearing looks broken from detonation. - DVDBURN (MD) 21:50:47 10/30/05 I agree with you. One cannot make an assumption though that - Ash's Z 21:59:14 10/30/05 The rear #5 and #6 cylinders running hotter is - Shawn300zTT GT28R MD 00:07:48 10/31/05 Yeah, his block has ported cooling galleys, but the water - Ash's Z 00:23:45 10/31/05 Awesome man, My fingers crossed as well. - Shawn300zTT GT28R MD 00:43:41 10/31/05 right..so explain to me how i had 1 cylinder det - genic 08:57:10 10/31/05 I dont know - I was hoping you might be able to answer - Ash's Z 11:25:00 10/31/05 in my case...it was det. nothing wrong with the parts - genic 11:45:28 10/31/05 Well, I dont agree with you on that. Unless you were - Ash's Z 13:21:05 10/31/05 you dont have to agree with me... - genic 13:29:44 10/31/05 If it runs rich enough, all it will do is just misfire - it - Ash's Z 13:40:04 10/31/05 why it failed: det on the single cylinder - genic 13:56:23 10/31/05 Why was it only detonating on that one cylinder though? - Ash's Z 14:01:51 10/31/05 And BTW, I dont know if I am wrong or right on the - Ash's Z 15:34:55 10/31/05 LOL running rich causes detonation, eh? - Joe(NoVA) 17:36:03 10/31/05 no...it doesnt - genic 19:49:07 10/31/05 Sorry Genic, you didn't confuse me at all. - Ash's Z 21:14:47 10/31/05 2nd. (n/m) - Shawn300zTT GT28R MD 00:03:10 10/31/05 Hey Ash, I'm too ignorant to comment on the likely causes - robo (sebring1970) 22:14:51 10/30/05 Thanks, Anthony. Hearing your feedback is reassuring - Ash's Z 22:57:32 10/30/05 lol, thats robo. (n/m) - Spee 23:05:03 10/30/05 Thanks Robo.. Its been a long two weeks for me out of - Ash's Z 23:09:23 10/30/05 that's Spencer ;) (n/m) - SactoTodd 23:21:23 10/30/05 Sorry Spee. - Ash's Z 23:28:20 10/30/05 2nd that...always interesting. (n/m) - BradZ (FL) 23:08:31 10/30/05 3rd that...I aways look forward to reading posts from Ash! - Zirvana 14:06:13 10/31/05 my #2 - genic 08:41:23 10/31/05 I though that was from boosting 20+ psi on crap gas - maglito 10:52:38 10/31/05 the wastegates are set at 10-12psi~ ...i only use 93+ - genic 11:43:10 10/31/05 *have yet (n/m) - genic 11:45:52 10/31/05 So you dont believe there was a manufacturing issue - Ash's Z 12:51:25 10/31/05 Sorry, I had heard something different. - maglito 13:18:32 10/31/05 Well, I think it would be fair to say that if that was the - Ash's Z 12:45:22 10/31/05 nope...my stupidity (n/m) - genic 13:01:13 10/31/05 How do you figure that though? You stated you were - Ash's Z 13:15:09 10/31/05 FWIW, and I know you've seen this before, but this is - Ash's Z 13:33:59 10/31/05 when you have yet to tune the engine - genic 13:37:04 10/31/05 Watch the language - this isn't a word fight. - Ash's Z 13:48:09 10/31/05 BTW, in your undying attempt to try and make me appear - Ash's Z 14:30:32 10/31/05 Its not necessarily that there is something different - DVDBURN (MD) 16:27:44 10/31/05 Well... >>>>>>>>> - Ash's Z 19:30:06 10/31/05 And FWIW, you have Wag's old TT that I tuned - I'm sure - Ash's Z 19:34:50 10/31/05 Well......you seem to be on the defensive at this point - DVDBURN (MD) 01:09:40 11/01/05 damn, i know there has to be quite a few of you folks out - Halo Z 05:28:27 11/01/05 all this drama AND free defamation (n/m) - dpjax 11:33:43 11/01/05 i had no names in my post. (n/m) - Halo Z 14:57:40 11/01/05 LOL, prove your words and I shall find truth in your - Ash's Z 13:50:19 11/01/05 As far as I'm concerned, Ash IS an agressive tuner. (n/m) - 300ZXquire 10:00:19 11/01/05 Yet he claims his chips are "safer" than JWT - SeedyROM 15:42:00 11/01/05 If what you say is true: I would have seen high - Slowninja(GT28RS Inconel Z) 19:34:09 10/31/05 I'll take a stab at it - DAYTONAZ 17:06:29 10/31/05 Well, out of balance would have affected more than - Ash's Z 21:20:11 10/31/05 That's definitely a single-cylinder issue - Joe(NoVA) 17:39:16 10/31/05 Your last statement is why I chose to micropolish the - Ash's Z 21:09:02 10/31/05
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