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Neat Swap! (archive)
[ Follow Ups ] [ 5-series (E12) Message Board ] [ Msg. Board FAQ ]
Posted by John in Simi Valley on January 09, 2002 at 23:59:19:

In Reply to: Looking for 3.5l engine posted by John on January 09, 2002 at 09:59:06:

As I understand it, the motors are interchangable - mechanically.

I recommend swapping the fuel and electronic systems as well - the performance curves are going to be different.

Best bet is to get a donor car like a 535i and cannibalize everything. Your radiator will need upgrading as well. A 3.3 liter motor(from a 533i or 633CSi) may be a good alternate because the Ox sensor lead (single wire VS 3-wire for the 3.5) is the same as the 528i, and the 3.3 motors rev better at the high-end than the 3.5, but the 3.5 has slightly more low-end torque.
(I have an '81 528i, a 633CSi and a 535i, amoung other BMWs)

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