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Man V 12 question

Discussion in 'Engines' started by JWY, Aug 5, 2010.

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  1. JWY, Aug 5, 2010
    #1
    JWY

    JWY Senior Member

    Joined:
    Feb 22, 2004
    Messages:
    1,567
    Location:
    Ft. Lauderdale
    Looking for info on MAN V12 1300hp, 1993.

    What is life expectancy before rebuild? Can it be run at lower rpm/speed for fuel efficiency without build-up or shortening of engine life? What is its sweet spot? Fuel consumption?

    Thanks!

    Judy
  2. Capt J, Aug 6, 2010
    #2
    Capt J

    Capt J Senior Member

    Joined:
    Jul 11, 2005
    Messages:
    14,524
    Location:
    Fort Lauderdale
    The sweet spot I've seen is usually around 1950 rpms on these. Yes it can be run lower speed and cuts out 1 side of the motor when the turbo's not really working (around 1000 rpms and less), if I'm not mistaken. I was told engine life was 5000 hours in a SF. Fuel consumption in a 57' Bertram was between 90-100gph for both at 1950- 1970 rpms.....it seemed to like 1970 for some reason. Queiter and more fuel efficient then typical 3412's of the same HP.

    Only issues I remember was these would blow/break the metal high pressure fuel line coming off of the injector pump and fill the bilge with diesel. However MAN came out with a newer design that fixed the problem and there shouldn't be any left out there with the old design anymore.