Rennvision: Jake's New Youtube Channel (w/ a complete review of M96/97 scoring)
02-05-2019, 02:49 PM
#1
Three Wheelin'
Thread Starter
Rennvision: Jake's New Youtube Channel (w/ a complete review of M96/97 scoring)
Just ran across this the other day. Looks like a great resource for the community and hopefully Jake will be updating it regularly.
He just released part 1 of a series all about bore scoring, similar to the one he did for PCA on the IMS. It's very informative.
If I heard it correctly, he states the primary mode of failure is not the cylinder liner. Its the piston skirt liner that flakes off and the scoring on the bore is a result of that. In countless posts about this I had never heard it explained that way.
He just released part 1 of a series all about bore scoring, similar to the one he did for PCA on the IMS. It's very informative.
If I heard it correctly, he states the primary mode of failure is not the cylinder liner. Its the piston skirt liner that flakes off and the scoring on the bore is a result of that. In countless posts about this I had never heard it explained that way.
02-05-2019, 05:06 PM
#2
His video on the rod bolt failure is brutal carnage... tough one to watch! 
This is a great resource for getting informed. 
This is a great resource for getting informed.
02-05-2019, 07:35 PM
#5
RL Community Team
Rennlist Member
Rennlist Member
I love his vids as they are real and not 'net speculation.... For those who may not be aware, some of his vids.... vids that show awful carnage.... are actually interviews by a member of the Porsche Club of America and posted on the PCA website. First in the series of vids start below.
I wish I did not see that vid... I can't eat dinner now.....
Peace
Bruce in Philly
I wish I did not see that vid... I can't eat dinner now.....
Peace
Bruce in Philly
02-05-2019, 09:12 PM
#6
the man know what he is talking about.. but for the price of nickies i would do ductile iron sleeves and never worry about it.. probaly half the price of nickies..
but for the price of a full rebuild the ls swaps are looking better and better..
but for the price of a full rebuild the ls swaps are looking better and better..
02-06-2019, 11:34 PM
#7
Racer
This post deserves pushing back up to the top again!
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02-07-2019, 01:28 AM
#8
Drifting
So, essentially, bore scoring is caused by piston slap.
That being the case, what is causing the pistons to rock in their bores? Are the rings wearing too much, or are the wrist pins wearing or is there just too much built-in clearance at start up in these engines? If it’s the latter, then that leads me to believe that bore scoring will eventually be the death of almost every M96/M97 engine.
That being the case, what is causing the pistons to rock in their bores? Are the rings wearing too much, or are the wrist pins wearing or is there just too much built-in clearance at start up in these engines? If it’s the latter, then that leads me to believe that bore scoring will eventually be the death of almost every M96/M97 engine.
02-07-2019, 09:32 AM
#9
Originally Posted by Iceter
So, essentially, bore scoring is caused by piston slap.
That being the case, what is causing the pistons to rock in their bores? Are the rings wearing too much, or are the wrist pins wearing or is there just too much built-in clearance at start up in these engines? If it’s the latter, then that leads me to believe that bore scoring will eventually be the death of almost every M96/M97 engine.
That being the case, what is causing the pistons to rock in their bores? Are the rings wearing too much, or are the wrist pins wearing or is there just too much built-in clearance at start up in these engines? If it’s the latter, then that leads me to believe that bore scoring will eventually be the death of almost every M96/M97 engine.
He said he would go into the why the coating is failing in later videos. Big cliff hanger.
But I'm guessing it will come down to warm ups, the proper method, ie: not letting the car sit and idle and then driving softly until full warm, to allow al metals to warm at a similar rate; and also using proper oil, DT40.
Cw
02-07-2019, 09:58 AM
#10
Rennlist Member
It seems to always start at #6. So is this at the end of the oiling pathways, the furthest from the water pump resulting in less protection and higher heats
I wonder what #3 looked like in that motor, if it was experiencing some or more wear than #5
I wonder what #3 looked like in that motor, if it was experiencing some or more wear than #5
02-07-2019, 10:14 AM
#11
Three Wheelin'
Watched most of the videos last night. Never knew his YouTube site existed.
02-07-2019, 10:25 AM
#12
Originally Posted by docdrs
It seems to always start at #6. So is this at the end of the oiling pathways, the furthest from the water pump resulting in less protection and higher heats
I wonder what #3 looked like in that motor, if it was experiencing some or more wear than #5
I wonder what #3 looked like in that motor, if it was experiencing some or more wear than #5
Cw
02-07-2019, 11:37 AM
#13
Drifting
Or, is the situation one where the skirt coating is so flawed that even minimal contact with the bore causes it to fail?
