Quote:
Originally Posted by Scharbag
No, I do not propose that you flog your engine while cold. It is good practice to warm it up. But BMW limits the cold RPM redline to a value that will protect the engine so there is no way that the damage we see can be consistently attributed to cold engines at high loading.
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They couldn't "properly" design a rod bearing, but they could figure out how to set a foolproof cold rev limit?
Even if they could, why would they then advise keeping it under 3500 RPM when cold?
The cold rev limit was most likely a compromise between limiting engine damage and allowing short bursts of high RPM in case the situation demands it. I agree that cold revving can't explain the rod bearing issue on this engine, but nor should we suggest leaning on the rev limit to protect the engine.