Posted by Troy Rudolph on July 29, 2002 at 14:49:07 from 141.202.248.12
In Reply to: 5er Fest Metric Mechanic 3.7 M30 Engine Raffle. posted by Duke - 85 M535i/Hartge on July 29, 2002 at 13:50:50:
If the 3.7L engine has a stroke of 86 mm as stated in the ad, the bore must be 94.5 mm or so to get a displacment that will round up to 3.7L using the BMW technique. Note: According to BMW, 3430cc = 3.5L and 3210cc = 3.3L. People not in marketing would round down.
If the 3.9L engine has a stroke of 90 mm as stated in the ad, the bore must be at least 95 mm to break the 3800 cc barrier so you can round up to 3.9.
I don't think either is possible. If it is possible, how durable?
Just a thought.