Can you check the roundess and taper of the "bad" cylinder? --- On Thu, 7/31/08, Bob Bundy <[EMAIL PROTECTED]> wrote:From: Bob Bundy <[EMAIL PROTECTED]>Subject: Re: Tailpipe smoking under load.To: [email protected], "Eric Schieb" <[EMAIL PROTECTED]>Date: Thursday, July 31, 2008, 7:30 PMThe whole thing started when I burned a hole in one of the exhust valves on track so yes I definatly had some detonation then I think. I have no Idea why 5 track days nemerous autocrosses and a fair amount of road miles on it and it burned a hole in the exhaust valve on the front straight of PIR with no prior warning of anything out of order just went 1 hole down. Valves were replaced all valve seals were replaced, head was checked out by the machine shop and injectors were replaced but I have had this smoking/oil issue ever since. bottom end wasn't pulled apart originally because their was no evedence anything was out of order with it. I don't see any knock now and I have also had it on a dyno and it ran strong with no knock and plenty safe AFR with some oil smoke althoug not as bad as some of the Hondas that were dynoing on the day. Now the machine shop that the head is at now tells me they can't find anything wrong with the valve guides. I can't see anything that looks like a problem with the rings, pistons, or cylinder walls. Only that my #1 rod bearing is shot but it looks like it wasn't so bad that it hurt anything else. How is it that I'm getting oil burning in the #1 cylinder? This has me stumped. Symptoms and evidence aren't agreeing real well. Bob ----- Original Message ----- From: "Eric Schieb" <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Thursday, July 31, 2008 10:34 AM Subject: Re: Tailpipe smoking under load. >I am not sure if my first note went through but . . . > > The bits on the piston reinforces the idea that the rod bearing > hammering is due to detonation caused by the oil in the cylinder. > Takers on the theory? > > Eric Schieb > > Bob Bundy wrote: >> No none, there were some marks I think that were from the bit of the >> porcelain that broke off the tip of spark plug. very small pits that were >> cleaned up. >> >> Bob >> >> ----- Original Message ----- >> From: "Rob Ebersol" <[EMAIL PROTECTED]> >> To: "Bob Bundy" <[EMAIL PROTECTED]> >> Cc: <[email protected]> >> Sent: Thursday, July 31, 2008 6:30 AM >> Subject: Re: Tailpipe smoking under load. >> >> >> >>> Any valve marks in the piston tops? >>> >>> On Jul 31, 2008, at 2:48 AM, Bob Bundy wrote: >>> >>> >>>> Pulled the engine the other night, took the intake and exhaust off and >>>> pulled the head. >>>> >>>> Again both intake valves on cylinder #1 were completely wet with oil >>>> on >>>> the intake side of them, actually puddle up a little, also Oil streak >>>> down one of the valves on the exhaust side of cylinder #1. All other >>>> cylinders looked perfect. Top of piston and cylinder walls look fine >>>> to >>>> me however I can see minor streaks in the cross hatching but nothing >>>> that you could feel. Head got dropped off at a local machine shop >>>> (Skagit Cylinder Head) he will pull it apart and look at it tomorrow >>>> morning. >>>> >>>> Took the pistons out tonight. Absolutely no evidence of any ring >>>> issues >>>> that I could see. A glaring issue did show up however, #1 rod bearing >>>> is >>>> hammered. bits of it were stuck in the oil pickup screen. not a mark >>>> on >>>> the rod journal that I can determine however. nothing else seems >>>> excessively warn either and all the other bearings look fine. >>>> >>>> Bob >>>> >> >> _______________________________________________ >> Miatapower mailing list >> [email protected] >> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >> >> > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower _______________________________________________ Miatapower mailing list [email protected] http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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