ah, i was wondering when the flat motors would arise.
when i think flat, i think porsche, and air cooled. no H2O probs.

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i also have a V4 honda, 90 deg V, 180 crank, with gear driven cams. quite a unique engine, spins to 12.5K. 3/4 liter with approx 105 HP. it will kill my 3.5 liter bimmer, but it weighs less than 500 lbs!

some of the new subaru's are turbo flat 4's, like the WRX.

ive owned 3 inline MB's. two sixes, and one five. liked them all.