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V8 vs I6 weight (archive)
[ Follow Ups ] [ E46 M3 Message Board ] [ Msg. Board FAQ ]
Posted by Hooster on March 19, 2000 at 14:31:10:

There seems to be some confusion about the weights of the BMW I6 and V8 engines. I would like to get to the bottom of this issue so I want to ask some questions and I would be most grateful if anyone who knows the answers responds.

1. Will the new M3 engine have an iron block?

2. Will the new M3 I6 engine weigh more than the 5 liter V8 in the M5?

3. Assuming the I6 block weighs more than the V8 engine block, what about the whole package? That would include camshafts, (4 for the V8, 2 for the I6), the crankcskaft, connecting rods, cylinders, clutch (probably heavier duty for the V8), gearbox (probably stronger for the V8), fluids (more oil and coolant in a V8), etc. So, can anyone tell me if the whole V8 package is lighter or heavier than the I6 package?

Bear in mind that BMW makes the same cars with I6 and V8 engines. In all cases the V8 cars are heavier than I6 cars. Just look at weight stats for the 5 series, I6 vs V8. If the V8 really is lighter, why is the V8 car heavier?

I can imagine the V8 block weighs less if it is aluminum and the I6 is iron. In spite of this I can't imagine the whole V8 package weighs less than the I6 package. Does anyone here know the hard facts?

Hooster



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