longer legs for an slc ??

Discussion in 'Engine' started by aegir slc, Apr 6, 2014.

  1. aegir slc

    aegir slc New Member

    Messages:
    3
    Joined:
    Nov 12, 2013
    Car:
    350 slc
    Hi there, I have a 350slc chassis 107.023 engine 116.982/4 it currently runs the original 3 speed box but I'm wondering if there is an easyish swap for a 4 speed box and would it improve cruising performance and perhaps fuel economy? thanks
     
  2. Druk

    Druk Administrator Staff Member

    Messages:
    5,309
    Joined:
    May 28, 2004
    Location:
    Not far from Edinburgh.
    Car:
    2011 S212 E350CDi. 1981 R107 300TurboDiesel.
    The 3speed and 4speed boxes both have direct 1:1 top gear ratios so changing wouldn't affect anything other than possibly acceleration times.

    A longer axle ratio would drop revs at cruising speed but it's doubtful if it would have much effect on consumption since you would probably just use more throttle to maintain revs. These cars have notoriously high revs/road speed but you can be sure the factory chose the gear ratios carefully.
     
  3. OP
    OP
    aegir slc

    aegir slc New Member

    Messages:
    3
    Joined:
    Nov 12, 2013
    Car:
    350 slc
    fair enough, think I can live with in that case, saves me some work! thanks for this
     
  4. tonysmb

    tonysmb Hardcore MB Enthusiast

    Messages:
    291
    Joined:
    Oct 11, 2011
    Location:
    South Devon
    Car:
    E350 CDi coupé, A150 (W169)
    If there's nothing wrong with the actual box / diff, I would be surprised if any changes, even if feasible, would improve mpg sufficiently to make it economically viable.

    When they were current, there was a view that MB tended to 'under gear' their cars such that the driver had instant throttle response when driving on the autobahn in top gear, and the drivetrain was engineered around that. None of this 'economy' nonsense :D

    The need for economy crept in later, after production of the SLC had stopped. I haven't driven an 350SLC but did have a 450SLC for years many moons ago, lovely car but I agree it wasn't the most economical of cars. But then I didn't buy it for that :)
     

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