is a 325i and a 525i the same engine?

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silvia
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Thu Feb 28, 2008 11:08 pm

as above just a quick question really

many thanks
Matt
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silvia
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Thu Feb 28, 2008 11:10 pm

p.s what about out of newer 3 and 5 series, thay look different but will thay bolt strait in?
Jesus325iTouring
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Fri Feb 29, 2008 12:20 am

Yes,well sort of.

My Touring now has an E34 five series engine,it was from an F reg if that helps.

As for bolting straight in,it pretty much does,you just need to swap various ancillaries over such as engine mounts.

The 5 series gearbox was different to mine so we had to put my original gearbox back in.

The engine your talking about is the M20B25,some of the techies on here will probably be able to give you the exact years the 5 series used this engine,I just know for certain an F reg one is the same.
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Jesus325iTouring
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Fri Feb 29, 2008 12:36 am

I've just remembered why the 5 series gearbox was different.
The gear lever linkages were different,but straight forward enough to change over,the main problem we had was the gearbox output flange (?) if thats what it's called wouldn't match to my propshaft,it was a 3mm to big,and unless you have tools and inclination to change the output shaft the 5 box is no good,it looked a bitch to change it which is why we put my original box back on.
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darkchild
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Fri Feb 29, 2008 8:58 am

Early E34's have the M20 (E, F, G Plate etc). The 24 valve M50 was introduced in 1991 iirc.
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Brianmoooore
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Fri Feb 29, 2008 9:02 am

darkchild wrote: The 24 valve M50 was introduced in 1991 iirc.
Yes, it fits in. Have a read of the 31 page 'sticky' at the top of the engine swaps forum.
Fushion_Julz
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Fri Feb 29, 2008 10:48 am

E34 525i is an M20 (or M50 later)
However, E28 525i is an M30
1987 Henna Rot M3 (was 195bhp CAT..now more and no cat)
2001 E46 330i SE Touring (manual)
Blitz
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Fri Feb 29, 2008 1:59 pm

Is the M50 engine better then the M20?
bss325i
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Fri Feb 29, 2008 2:02 pm

E28 525i uses an M30 so is not the same.
http://www.bmrperformance.co.uk

BMW and MINI specialist - Gatwick
darkchild
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Fri Feb 29, 2008 2:43 pm

Blitz wrote:Is the M50 engine better then the M20?
Of course not, BMW wasted millions of Deutschmarks designing an engine thats worse that the one it replaced. :D

More powerful, more economical, 4 valves per cylinder, chain driven M50...or an oil leaking, cylinder head cracking M20?

Seriously though, they're both decent old things but a M50 is considerably nicer.
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