M102 2.0L vs M111 2.0L?

Discussion in 'Engine' started by Donbronski, Sep 9, 2009.

  1. Donbronski

    Donbronski Active Member

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    I was looking into getting another W124, the one i have been looking at has the M111 1998L 4V Engine in it.

    Is this a better engine to have in the W124?
     
  2. grober

    grober MB Master

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    The obvious comment is that the 4 valve engine has more power then the older design but the torque characteristics of the single cam engine mean it comes in at lower revs. The early single cam engines with the single timing chain need to be watched whereas the later duplex chain units are fine. The M102 engines were notorious for cylinder head gasket failure at high mileage but the M111 engines are not immune from this due to cylinder head bolt stretch problem. Its probably in the area of fuel injection and ignition that the biggest differences occur. The earlier engines have essentially mechanical fuel injection Bosch Jetronic K or KE with discrete ignition systems[ EZL ]with separate distributor and HT coil. These systems are very reliable if looked after and easy to repair altho with age some of the EZL control units are getting expensive/difficult to source. The later twin cam engines have integrated electronic injection+ distributorless ignition which are reliable but can be expensive to repair. Their valve gear is pretty sound with the variable inlet cam timing being the only component to watch [not sure if this 2.2 litre engine feature is found on the 2.0 litre model?]
     
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    Donbronski

    Donbronski Active Member

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    Thanks for the info.
    Still a little confused, you saying there is a single cam 4V engine and a twin cam 4V engine?? Or when you mention single cam are you refering to the old M102 engine?
     
  4. grober

    grober MB Master

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    No the M102 engine is single cam 2valves per cylinder --the M111 is twin cam 4 valves per cylinder When I said single cam engine I meant the M102 engine Sorry if this wasn't clear.:eek: I would amend my first post but due to the "shutters coming down" couldn't do it.;)
     
    Last edited: Sep 9, 2009
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    Donbronski

    Donbronski Active Member

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    Oh OK, So the 4V Engine has better low end torque comared to the old M102 engine? & similar top end torque?
     
  6. grober

    grober MB Master

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    M111 2LITRE 136 din HP @ 5,500 rpm --- ---190Nm @ 4,000 rpm

    M102 2LITRE [INJECTION] 122 din HP @ 5,100 rpm -------172Nm @ 3,500rpm

    means you don't have to rev the M102 engine quite so much to get max power/torque but the 4 valve engine has ultimately more power/torque
     
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  7. OP
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    Donbronski

    Donbronski Active Member

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    Thanks for the technical data,

    I have the M102 2.0L fitted with the pierburg Carb so i should imagine it'll be even more of jump up in power.
     
  8. grober

    grober MB Master

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    You will notice a big difference[ 30%] but particularly during cold starts on winter mornings where the superior mixture control of fuel injection shows up the old carburettor!
    M102 2 litre carburettor 105 din HP @ 5,200 rpm -----170Nm @ 2,500 rpm
     
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    Donbronski

    Donbronski Active Member

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  10. d w124

    d w124 Hardcore MB Enthusiast

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    Why don`t you look for a big engine?
     
  11. OP
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    Donbronski

    Donbronski Active Member

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    I'm fairly new to driving, have convictions & earn an average wage...

    Obviously I'd love to have a W124 with something like a 5.0L V8 quad cam, 6.3L or what ever they've managed to wedge under the bonnet, Maybe a few years down the line things will change.
     
  12. d w124

    d w124 Hardcore MB Enthusiast

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    Go for E220 al least.Same m111 engine,but 150bh
     
  13. OP
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    Donbronski

    Donbronski Active Member

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    too late, hopfully picking up a 200E M111 saturday
     
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