Quote:
Originally Posted by catpat8000
Guys, you need to be pretty careful on how you use this data. While I appreciate SFP working to get more data, let's examine what he has obtained.
The list of cars is at 30. Of those, 6 were supercharged. 4 of the engines had valve issues, not rod bearing issues. 7 (probably more - some FI cars weren't clearly identified) of the cars had tunes. 1 car had a failed oil pump.
So if we factor out extenuating circumstances, and we assume the best case for missing data, we are left with this:
17 cars failed:
- 6 2008 models
- 2 2009 models
- 1 2010 model
- 6 2011 models
- 2 2012 models
As many have pointed out, 2011 cars often had build dates in 2010. My own M3 has a build date of April 2010 and it is a 2011 model.
So assuming that there is some statistical significance in this smallish amount of data, it does not conflict with the notion that the new bearings reduced the odds of an engine failure.
Pat
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I did the same with my latest Excel file and I got something a little different.
19 cars failed:
- 6 2008 models
- 1 2009 models
- 1 2010 model
- 7 2011 models
- 2 2012 models
- 2 2013 models
I'll keep on it and see what else I can find out....I still have to re-message some of the voters to help fill in the missing fields.
As you say the sample is very small which in itself is very encouraging.