sorry forgot to answer your 2nd Question, "what was the exact failure?"
Piston #1 shattered or came apart and a piece made it to the bottom of the Rod where it finally collided or jammed and blew out the bottom of that Cylinder.
wall was not damaged. could be salvaged by sleeving that Cylinder and using for N/A build only from then on but i decided to go with another block.
Custom Rods have been Triple checked and Andrew is certain they are OEM Length NOT the Length Requested....so Carrillo must now make new Rods to our Requested Specs....:thumbdwn:
We just assembled a motor for one of our customers with a Lang widened crank and custom Pauter rods. So far so good as far as the assembly is concerned. It is a car that will see track days and the usual thrashing.
Because probably nobody knows that. :thumbup:
S50 wasn't delivered in the US afaik, so none of those race shops have probably ever seen one, let alone developed on them.
That LangRacing widened crank looks very interesting.
As a side node, the one thing that I'm not sure I agree with on LangRacings page detailing the R&D of the part is that BMW engineers made a mistake.
No mention is given to 15k mile oil change intervals... Maybe BMW was correcting for a scenario where some car owners where happy to run hard without shortening the oil change interval (extra maintenance), something anyone in the performance world would know to be obvious. Maybe the recall was motivated by maintenance issues rather than a design flaw.
I feel that LangRacing, suggesting an error made by BMW engineers, have done themselves a dis-service by not touching on the maintenance issue in their R&D write-up; even wider bearings will fail if oil changes are inadequate.
Block looked good to the naked eye but once you start to set the bearings, #1 was too tight.
Motor was purchased from Sammy out of Chicago aka Belaboy off M3F
He told me that a pulley fell off and was bouncing around which cause a nice ding in the main pulley. Once Andrew received that motor and disassembled it he confirmed that it was built n machined using 87.5mm pistons but unknowing what truly happened and the extent of that damage.
Since then of course he has ignored all my PMs, text, emails n calls
So I looked for another block and will see him another day
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