Re: max. power, torque of the 633, 635? (archive)

3.0 185lb/ft@4500 8.0:1 compression
3.2 196lb/ft@4000 8.4:1 compression 1978
3.2 188lb/ft@4200 8.0:1 compression 1979
3.2 195lb/ft@4000 8.8:1 compression 1981
3.4 214lb/ft@4000 8.0:1 compression 1985 DME2
3.4 225lb/ft@4000 8.0:1 compression 1987 DME3

FYI. The M30 3430cc 3.4L motors were all Motronic motors. I don't know if you want ot do the conversion as it is costly and you will have to upgrade electronics and harnesses for your car. However, the M90 3453cc 3.5L euro motors were Jetronic and you may be able to swap one of these into your car.

I'm on the verge of an engine rebuild of an E12 1977 530i and want to know how much is gained over my stock 3.0L by rebuilding my M30 block as a 3.3L or 3.5L. I know what needs to be done from an E12 forum, but I don't have any engine specs. for E24s.
My blue book tells me I have 175 HP at 5500 RPM and a max.
torque of 188 ft. lbs. at 4500 RPM for my 77 530i.
I don't have any E24 reference manuals, so I was
wondering if anyone could tell me how much power and
max. torque I can achieve with the 3.3 L or 3.5 L
M30 engines. Thanks...

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