Differences between UK and US E36 M3 engines

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  1. Differences between UK and US E36 M3 engines 
    #1
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    ok. Many people think that the Euro E36 M3 engine (3 litre or 3.2 evo) is the same as the US E36 M3 engine of the same vintage/capacity.

    They are two very different beasts;while some parts are universally interchangeable between different model/year/type BMW's...the Euro M3 engine is handbuilt with competition in mind and the US M3 engine is essentially a stroked 328i engine.


    It seems the main difference is in the cylinder head. I cant get exact details on block differences suffice to say they are apparently a " similiar cast iron design" but the cylinder heads and just about every other part number is different.
    Additionally several Swedish tuning gurus who have built both types of engine confirm that the Euro engine is MUCH stronger and has bigger main bearings.

    The basic design differences in the heads is visible by looking at the Intermediate Housing section on the Euro diagram.

    Heres the facts of the matter.

    Both for 1995 M3

    Euro Vs US



    First the US M3 1995

    Cylinder head

    Overview of the entire head

    http://www.realoem.com/bmw/partgrp.d...86&hg=11&fg=15

    The actual head itself

    http://www.realoem.com/bmw/showparts...=11_1506& hg=

    11&fg=15

    head Gasket

    06 CYLINDER HEAD GASKET ASBESTOS-FREE 1,74MM 1 11121405106 $146.20

    engine block

    No. Description Supplement Qty From Up To Part Number Price Notes
    01 ENGINE BLOCK WITH PISTON 1 11111404960 $4,486.32

    oil pan

    OIL PAN 1 11131735937 $397.30 +core

    Flywheel

    Description Supplement Qty From Up To Part Number Price Notes
    01 TWIN MASS FLYWHEEL 1 21212227820 $859.32

    Crankshaft

    CRANKSHAFT W. BEARING SHELLS 1 11211403798 $2,940.66

    The Euro M3 Motor 1995

    Cylinder Head

    Overview of all head parts

    http://www.realoem.com/bmw/partgrp.d...32&hg=11&fg=15

    The head itself

    http://www.realoem.com/bmw/showparts...=11_1310& hg=

    11&fg=15

    Head Gasket

    11 CYLINDER HEAD GASKET ASBESTOS-FREE 1.74MM 1 11121405748 $146.20


    Engine Block

    No. Description Supplement Qty From Up To Part Number Price Notes
    01 ENGINE BLOCK WITH PISTON 1 11111402380 $4,486.32 +core

    oil pan

    NOT SUITABLE FOR
    INDIVIDUAL SERIES 95 GT INTERNATIONAL
    01 OIL PAN 1 11131317285 $806.31

    Flywheel

    01 TWIN MASS FLYWHEEL 1 21212229011 $859.32

    Crankshaft

    CRANKSHAFT W. BEARING SHELLS 1 11211402385 $2,940.66 +core

    Ream Oem pictures are not accurate pictures of parts design's


    More info will be added but the above diagrams demonstrate clearly that there are not many similar parts between the two motors.

    Thats not to say one is better than the other...indeed big power has been brought out of the US M3 motor on a variety of cars/occasions.
     
     

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    you are deffinitely right on most stuff
    but ill add some info i gained while building my turbo euro M3

    the block is similar in dimensions, but is very different internally
    the webbing is thicker,
    the mains are bigger,
    the crank weighs nearly 20Lbs. more than the US crank and uses 4 bolts to hold the nose on instead on the 1 on the US cars,
    if i remember correctly the euro motor uses 11mm head bolts
    it also has 3 holes for the 3 knock sensors,
    and i think it also has 3 freeze plugs where the US has 2

    if i think of anything else ill add it later, and i wont even get started on the differences in the head
    lets just say the overall head design(throttles, head, exhaust ports) can flow nearly 75% more air than the US head
    this becomes veru evident when force inducing the euro motor

    ive seen a stock euro motor lay down 468Kw to the wheels, in 4th gear, at 0.4bar boost
    turbo was a T68 mounted on the most amazing piece of manifold work ive ever seen(equal length, equal volume) and a massive custom intake and intercooler
    not to mention it sounds like a 2-stroke race motor revving like all hell broke loose as soon as the boost comes on
    it almost sounds like a bike, but then you realise its running thru the rev's too quick

    Now for all you US motor guys, dont get me wrong, the US motor can make some serious power and take one hell of a beating, where the euro motor is much more finicky and requires tons more attention and maintenance, but theres just no comparison
    now if you hog the life out of the head, oversize the valves, and slap some ITB's on it , the US motor becomes 99% the beast that the euro motor is

    my good friend has a US 3.0 with alu. rods, cp pistons, big valves, sunbelt race cams, and literally every other upgrade available for the US motor except for some throttles and the car absolutely screams on motor, and tries to fly on the spray(175 shot direct)
    were gonna try and get ITB's for it and were getting a custom nitrous setup from the UK(wizardsofnos) and basically were gonna try and break it so we can install his 3.5 stroker and boost it

    the biggest problem with the Euro motor and why i think it really never became a hot item in america is the lack of parts and vendor support
    also the VANOS on the euro motor is so unreliable its funny, and they cost a small fortune, just one thing most potential owners would hate to deal with
     
     

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    Great info Top Shotta

    Many Thanks

    Please add to that list if you find any other differences.

    I know the Euro main bearings are much beefier too than the US motors mains
     
     

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    Incidentally, I have now bought a spare S50B30 to make into an uber cool coffe table

    pics to follow!
     
     

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    dont take this the wrong way but...

    WOW what a waste
     
     

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    Quote Originally Posted by topshotta02 View Post
    dont take this the wrong way but...

    WOW what a waste


    I should have clarified that Top shotta..
    Its only a block !! and I have another one in a complete S50B30 motor. ( I also have an S38 B36 full motor *the kingpin of my collection!!)
    They are plentiful around these parts (not S38's...but S50B30's
    Last edited by Boostist; 22-06-2007 at 00:44.
     
     


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