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EDIT: er..there should be an 'of' somewhere there in the tile. As a mechanical engineering student I have some sort of weird fetish for catastrophic mechanical failures.   
MisterSparkle fucked around with this message at 14:39 on Oct 31, 2009 |
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Oct 31, 2009 14:33
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leica posted:How in the hell does that even happen? Did he not tighten the lug nuts? 1/2" Lug Nuts on a M12 Stud. Was able to get them on and tighten them (stripping the thread in the process). That was result.
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Nov 1, 2009 03:26
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I like where this thread is going
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Nov 1, 2009 11:29
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Doctor Bud posted:I think that's due more to the inherent mechanical imbalances in a straight-8. Crank whip anyone? Interesting. See I was educated that I-8's are gone because of the ridiculous packaging that they required in the engine bay. Then again, If you can package a I-6 transversely these days, perhaps a longitudinal I-8 isn't that out of the picture. I guess however, it's the same length as a V16. So you might as well crank one of them if anything. Also, with vibrations I understood that I-8 had a completely balanced second moment of vibration (As it is two I-4's together). Much like a I-6 or any boxer engine. And that is why you can have v12's and v16's at any bank angle.
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Nov 2, 2009 10:35
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Hypnolobster posted:Well yes I know, but the experience would be roughly the same. get an alfa or a jag.
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Nov 6, 2009 03:41
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alot of modern diesels have an electronic butterfly in the inlet to stop pumping loss. These can be shut to stop run away. I've seen photos of butterflies bent out and eaten, just to due to pressure differential and flow.
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Nov 18, 2009 03:38
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wow, this thread really went off track
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Feb 13, 2010 01:46
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frozenphil posted:Detonation is bad, kids. However, if you know a badass with a welder, he can fix you up proper. In the same vain: 
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Feb 15, 2010 12:18
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2ndclasscitizen posted:How the gently caress would that have happened? In the immortal words of my car buddy: ++Ignition -Fuel
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Feb 15, 2010 12:43
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Valid theory Pipkin. Otherwise if the detonation was caused by overheating, one could assume that the flame front (and the hottest part of the burn) would be ignited by a "hot spot" on a cylinder wall.
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Feb 15, 2010 14:08
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If anyone can figure this one out, I'll be impressed: I've never seen, read, heard of a failure of anything like this. That is the Exhaust Cam (Stock RB25DET), above cylinder 2. Friends Car, pulled the rocker cover last night. Specs: Nissan R32 Skyline GT-ST Swapped R33 RB25DET: -Forged Internals -Larger Low Mount Turbo -GTR Oil Pump -Retuned on Nistune -~230kW Obvious signs of seized cam bearing(s) are non-existent (scoring, colour, slop). Failure does not have radial direction marks and failure through torsional shear is not apparent. KaiserBen posted:
Want to sell me the throttle bodies? MisterSparkle fucked around with this message at 05:46 on Mar 8, 2011 |
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Mar 8, 2011 05:38
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Fire Storm posted:Was the missing section there or was it completely missing? (With something that weird, I have to ask) Nah, it was there (removed to show failure grain). Story goes: Car had started whining a little from what they thought was the CAS bearing, the mechanic said it was not a problem and they ordered a new CAS. Driving along and heard what can only be described as a metal bang noise, car lost power, was able to get it restarted once but was rough and poo poo. Replaced CAS and used my consult cable to clear all error codes, no love, we towed it back to the garage and in the tear-down found this. Gonna have a look with a boroscope over the weekend and see if we bent any valved or dinged the pistons. If not: Replace cam, compression check >> run like that If damage: Pull engine, junk, put in a new one.
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Mar 8, 2011 08:37
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the_reject posted:The only time I've ever seen anything remotely like this was on a 300TD turbodiesel that the owner tried doing his own valve adjustment. He got so far as mal-adjusting the clearance on cylinder 1, realized he was out of his league, put it back together, and hit the starter. On the first revolution, valves and pistons shook hands and the cam broke exactly like what you have pictured. No torsional or radial shear marks, no large crystalline structure in the cast iron indicating poor casting - it just plain fuckin' broke the camshaft. I don't know...can't figure it out. More information: -The Exhaust Cam Gear is ~3 teeth out, no idea if this was before...or after said failure -I was wrong about the location of the break (it is the second lobe of #1 and first lobe at #2). -The failure was at the machining start for the bearings at these locations -Tappets spin freely (not that doesn't indicated a seized lifter) and there are no marks on them from say, resistance against the cam. -the end section of the cam appears free from binding in any of the bearings (although it is cold now, so who knows) 
MisterSparkle fucked around with this message at 01:01 on Mar 10, 2011 |
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Mar 10, 2011 00:48
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Dang, goodbye clutch basket. Looks like a R6 Pack with more clutches....R1 perhaps?
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Jun 13, 2011 22:46
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abs pressure pumps and solenoids draw huge amounts of current due to the required force and speed required for actuation. some specs I've seen seem to suggest surge currents of 60-80A. basically, inductive loads are a bitch.
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Jul 18, 2011 14:58
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sigtrap posted:Post mechanical failures you stupid motherfuckers. In an attempt to revive my thread:  my old FSAE team, out on a test day. Guess no one thought to crack test the ally hubs after the last race. The ally hub is my design, but they modified it to include a 4140 steel CV housing instead of machining it into the aluminium, improved the lifetime of the CV faces. But obviously didn't think about the stud stresses or fatigue. Ohwell. MisterSparkle fucked around with this message at 11:36 on Aug 15, 2011 |
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Aug 15, 2011 11:32
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atomicthumbs posted:Jesus what did they do? Drive into a lake? Not a lake, a different body of water. MisterSparkle fucked around with this message at 00:26 on Sep 6, 2011 |
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Sep 6, 2011 00:15
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Rev. Dr. Moses P. Lester posted:Post Horrible [snip] Refrigerants came to post almost this exact phrase
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Dec 4, 2011 04:01
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YAY. The thread is back! In celebration:  From a car that I used to work with.....
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Aug 21, 2012 11:53
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| # ¿ Apr 27, 2024 09:58 |
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Nomex posted:I saw this guy in the parking lot yesterday. He's just got his ackerman set to "F1-Spec"
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Mar 27, 2013 09:40
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