Title: #61 takes its last breath of the season - Page 5 - Rennlist Discussion Forums



Title: #61 takes its last breath of the season

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Old 10-13-2016, 12:50 PM   #61
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South to Dixie? Gee, let me guess...
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Old 11-08-2016, 06:18 PM   #62
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Default Which one is not like the other - inspection complete

Well this is what happens when #1 cylinder rod bolt lets go and....


The rod cap comes off and the rod bearing comes out and gets flattened...


The rod cap and rod are thrashing around the crank and all hell breaks loose leading to D chunks and block fractures




Needless to say the block, carrier and crank are DOA. Another core is being sourced and the rebuild begins. In the case of the M97 engine, Porsche designs great engines for sport cars that can be tracked. Based on this design criteria an acceptable set of rod bolts was used. However #61 was turned into a track car that hit the track nearly every weekend and only occasionally streeted. That was asking too much of the bolts which, according to my research is a weak point. Lesson learned? M97 engines that are heavily tracked should consider a refresh sooner rather than later to improve known weak points before they grenade
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Old 11-08-2016, 10:06 PM   #63
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Amazing stuff Stan. Glad you are in good hands for the rebuild. I know that the rebuilder takes tons of pics of his work so you should be able to follow the process from 2000 miles away.

Tom
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Old 11-08-2016, 10:12 PM   #64
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Similar thing going out here
Oil overheated and grenade the internal which is kind of rare of a dfi engine.

Driving too hard..... ahhh

Attachment 1106139
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Old 11-08-2016, 10:37 PM   #65
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Rod bolts are def the weak link in these engines.....the problem is if you go in early to change the bolts what else do you do while you are there? that's the SCARY question!
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Old 11-08-2016, 10:46 PM   #66
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Sorry to hear that Seb.
In your case oil coolers, pressure and temp gauges are a necessity...however, racing the way you do I am sure you would have no time to look at the gauges
Go with all the good hardware for your race engine rebuild = gotta finish to win
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Old 11-08-2016, 11:07 PM   #67
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Yup, that is the challenge (spend vs benefit). Depends if you are going for a stock refresh, a DE engine or a dedicated track motor, that will dictate the <while i'm there questions> I know what I am looking for in my engine so less of an issue for me as my requirements dictate all reciprocal moving parts will be changed. In any event, if this is a preemptive refresh you will be changing out many parts anyways so new high quality bolts and studs are a minor expense compared to the rest.
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Old 11-09-2016, 12:26 AM   #68
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Stan-O, I feel for ya.

Clearly need to discuss soon over some PORK.

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Old 11-09-2016, 02:17 AM   #69
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Pork is good
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Old 11-09-2016, 01:28 PM   #70
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Quote:
Oil overheated and grenade the internal which is kind of rare of a dfi engine.
Not really.. I've seen that one a lot over the past 6 years.
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Old 11-13-2016, 10:16 PM   #71
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I love the engine photos!
Imagine recycling those warped, bent, chewed and twisted, customized parts.
A new Spoon Sculpture is in the early stages of development!
Maybe you could incorporate an IKEA lampshade.

"If you have to ask the price...................."
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Old 11-14-2016, 03:59 PM   #72
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I am a big fan of up cycling for the mancave - In the idea generation phase right now.. something to do this winter
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Old 11-30-2016, 08:43 AM   #73
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Any updates on your progress?
Happy Holidays!
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Old 12-01-2016, 10:46 AM   #74
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No major updates yet, still sourcing the core...Wishing you and yours a great holiday season in the new home and looking forward to catching up at the May DE. Is your Christmas present, aka, Garage lift in?
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Old 12-02-2016, 08:40 AM   #75
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Ha!
No, not installed yet. As per the usual course of a construction project, this event is running along at its own time frame. Drywall is hung and finishing taping by next week? Should get the lift in b4 X-mas?????
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