Quote:
Originally Posted by BMRLVR
No offence to the shops you spoke to since I don't know who they are, but, what they told you is laughable! 0.001" is just plain too tight for a rod bearing, especially in a high revving engine running a 60W oil. Yes additional clearance "will" fix the bearing issue, plain and simple! Forget talking to speed shops........ Call a machine shop that builds engine and see what they tell you! Many shops/people work on engines, but that don't make them qualified as engine builders.
Clearances are clearances and clearance recommendations on engines have not changed in a long time. Yes, some minute differences do exist depending on the service requirements and some race teams are going a little tighter now but they aren't cutting clearance recommendations in half! They are reducing clearance by say 0.0005" or 0.00075" which still puts them in a safe range. If the S65 had even 0.0015" on the rods I probably wouldn't worry, but with 0.001" I am not comfortable.
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I agree sir, some say the engineers at bmw know what they are doing. If that was the case we wouldn't have all the pictures of cavitation going on with the m5 and m3.