Re: Euro vs. U.S. models' reliability (archive)

: A point was made recently by someone trying to sell an early '80s Euro 635 that the early Euro version, having fewer "frills" than the the U.S. version, has fewer parts to fail and therefore has a reputation for greater reliability.

I'd say that this is somewhat true.. The early euro 635's ran the standard single cam M30 motor w/9.3:1 compression and 272 cam they pumped out about 218hp (later US cars 188). They also used the Bosch L-jet fuel system which is reliable although not possible to have a "chip upgrade" as the later motronic cars. Simple adjustable electronic ignition system (from 77-81) with NO motronic sensors in the bellhousing to screw with.

But being a lighter car(no US emission crap and lighter bumpers etc, 200 lb less) they are much quicker, handle better and can surprise many a standard US M5/M6 owner with their abilities.

Their main weaknesses??
Brake upgrades are few or non existant for the E12 chassised cars <1981.(unless you go the Alpina way for $$). They have a mechanical speedometer (which is good I think) and NO Si board to burn out like the later cars. The CR dog leg tranny of the early 635 has gotten a rep for not being as durable as the later 280 style in the later cars., but I have had no problems with the (4) that I own.

As for the M635/M6 well... they are in a different league due to the M88 engine in the car. These cars will take more maintaince to keep in top condition and ultimately cost more as well.

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