Originally Posted by duxthe1

Sure the M120 looks good on paper, but is a real world disappointment. As 20 year MB tech, I don't know anyone in the industry that would let you give them a M120 powered car.

Yes it is a slow revving engine. More isn't always better. The friction and pumping losses in it are significant and the inertial losses are massive. Torque, yes... snappy desire to rev, no.

Your 23 KG estimate is woefully low. You'll find the M120 over 100 KG heavier than the 201's heaviest optioned engine and 170 KG heavier than your current engine.

Compare your 201 tie rods to the 140 tie rods. Now envision having to re-engineer every mechanical part of the car by that factor. Then realize you'd be doing it for a lazy 390 hp.

Hey, its your time and your money. I'm not trying to leave the party with the girl you're interested in, I'm trying to warn you she's a dude.