Quote:
Originally Posted by SenorFunkyPants
Below are details of S65 engine failures taken from the recent engine fail poll started by US///M3:
http://www.m3post.com/forums/showthread.php?t=924916
Combined with details from the old thread started by aus:
http://www.m3post.com/forums/showthread.php?t=786615
Headline numbers:
Fails = failures excluding cars fitted with Superchargers.
Prod #s = Total number of cars built in that year.
Excel spreadsheet of data:
Notes:
All voters in the recent engine failure poll were messaged for data on their engine failure.
The replies noted a number of votes that had been made by mistake, while some voters did not reply at all
“Anon” usernames are users who gave their details but preferred to remain anonymous online. Blank entries are where no data was provided.
Production numbers supplied by "Sickfinga". The total numbers are greater than previously noted as they contain the final data for LCI E93 to end of production.
There was a main bearing revision in 2008 and a rod bearing revision in 2011.
Looking at those failures where bearings are likely to be part of the cause (leaving out the supercharged engines, oil pump or valve failures):
Adding 2008 & 2009 & 2010 together, leaving 2011 separate (as the exact date in 2011 of the change from 088/9 to 702/703 bearings is uncertain) and then adding 2012 & 2013 together gives a clearer idea of failure rates before and after the rod bearing revision in ~2011.
2008/9/10 15203 cars @ 10 fails = 1/1520
2011 8616 cars @ 7 fails = 1/1230
2012/13 6437 cars @ 5 fails = 1/1287
The fairly consistent rate infers that neither bearing revision has made any significant change to the low failure rate. |
Is the column labelled "Production Numbers" only US/CAN production?
Pat