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Author Topic: M40 too an M43  (Read 7231 times)

dagray

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M40 too an M43
« on: July 15, 2009, 07:42:37 AM »
I need help please, I want to swap my engines from my E30 and E36. But I would like to know A, how difficult it is. And B, waht parts need to swaped and changed...  I am want ing to change my G reg E30 318i M40 engine, with my M reg E36 316is M43 engine. Can anybody help??
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M40 too an M43
« Reply #1 on: July 17, 2009, 01:24:58 AM »
You would need the engine and transmission (m43 tranny is not compatible), wiring harness, ECU/DME, and the driveshaft. It would also make your life a lot easier to swap the cooling system, alternator and PS pump as well.  Now the difficulty level depends on your knowledge of engine components.
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M40 too an M43
« Reply #2 on: July 17, 2009, 01:44:09 AM »
these engines are both from the saem GENERAL M40 family, but the M43 is a single cam motor and the M42 is a twin cam.  This also means that the M43 is an 8 valve motor, while the M42 is a 16 valver.  The M42 makes more hp and torque than the M43, although the M43 is a more advanced (tech wise) motor than the M42.  The M43 is the single cam version of the M44, the M40 is the single cam version of the M40 (IIRC).  the M43-(TU) has the highest torque per litre of any two valve per cylinder engine so it is sort of respectable although it makes just 118hp!(valvetronic).
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