The only deviation on engine weight is the Z3 2.8 motor, which had an aluminum block, whereas the other cars 2.8s were cast iron blocks. This meant the Z3 2.8 motor weighs about the same as the 1.9 motor, and therefore an excellent choice for a conversion in the ti. (some accessories will be needed form a standard 2.8 to make it all work in the ti, but basically it's cool). Steve has done this swap I believe...
The M motors are all the same as far as weight goes (+- a couple pounds) as the M roadster (and I presume the M coupe`) use a different A/C compressor and mount casting then the standard M3 coupe` or M3 sedan. All these blocks are cast iron, like the normal 2.8. Battery location may have an impact on weight distribution in these cars, but strict engine weight is the same. |