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      07-01-2011, 05:46 AM   #14
Technic
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Quote:
Originally Posted by dencoop View Post
Are you sure about that logic... I mean what yor stating regarding the badge convention and Horsepower is accurate...although I think it's truly based on the model code of the engine.

740 = N54 twin turbo
535/335/135 = N55 Single turbo
335is/1///M = N54 Twin turbo
I am thinking the 640 should be the N54 engine like in the 740.

Let me know if you think Nam wrong...

Thanks!
BMW no longer is using the engine displacement or much less the engine code as the last two numbers in the model designation.

The 40i designation is based on power output, not by engine code. Remember, the *35i used to be a N54 and now it is an N55, however the power output remained the same and thus it kept the 35i designation.
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