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1350 hp MTU 2000 M90 Vs 1000 HP Cat C18 on 30 m Benetti. Which is Best

Discussion in 'Engines' started by Sean Twomey, Sep 21, 2020.

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  1. Sean Twomey

    Sean Twomey New Member

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    Considering 2 early to mid 2000 30m Benetti, one has 1350 MTU M90 and the other 1000 CAT C18. Which is more reliable and roughly how will fuel consumption per hour compare?
  2. Capt J

    Capt J Senior Member

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    I ran a then new, 30 ish meter benetti (98'), but it had MAN's and was probably a 2017. It seemed to have adequate power but was more HP. I'd say the C18's are more reliable, but have to change aftercoolers in them every 6 years. But not sure if the C18's would be enough power for that yacht. Mtu's will be a little quieter.
  3. Sean Twomey

    Sean Twomey New Member

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    Thanks
  4. olderboater

    olderboater Senior Member

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    Underpowered with either so I'd choose the MTU 1350's.
  5. Capt J

    Capt J Senior Member

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    It's a displacement hull so only does 12 knots no matter how much power you give it. Trust me, the one I ran had 1400hp MAN's I think, and I tried :eek:
  6. olderboater

    olderboater Senior Member

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    I'd still go for the MTU's.
  7. Fiammetta42

    Fiammetta42 Member

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    Look carefully at the service history , that’s probably going to be the decider .How ever if equal then the intercooler debacle with CAT s are inho best avoided , so it swings to MTU or MAN if possible .
  8. Capt J

    Capt J Senior Member

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    The C18 is an excellent motor, very very reliable, provided you replace the aftercooler every 6 years.......probably less expensive to maintain over time compared to MTU/MAN, IF you follow the service requirements by the book (cleaning all the coolers every 2 years specifically).
  9. Fiammetta42

    Fiammetta42 Member

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    Who does follow the MAN service schedule by the “ book “ ??
    In France and Italy the certified MAN agents themselves don’ t even .
    Assuming all temps / readings are within spec
    Maybe perhaps with new - re warranty issues , but once out of warranty folks just do a full strip as and when .
    Depending on the instal a lot slowly drain down when stopped so the coolers never really are left to pickle .

    So if you remove the cost of biannual strip then .......?

    The hull anodic protection and separate 24 v ( own starter + electronics ) isolation of the MAN system ensures a more guaranteed protection from galvanic protection .

    There’s no pencil anodes to risk disappearing out of sight or drying out , or multiple dissimilar metals in the cooling component construction with MAN / MTU ........unlike CAT s .

    As you say CAT ( law suit losses ) now suggest the after coolers are a throw away part , timed for what ever 6 y ?
    That’s scary the thought of water entering into a cylinder through no real fault of the operator .

    Given a choice which is what this thread is about it’s about an informed choice .
    As said the SH needs going through .

    Hear of cooling components corrosion here in the Med with CATs C12 , C18,s C32 s from about 2005 up.Boats being stuck away from there home ports awaiting fixes .
    MAN s the odd sensor, a 48 hr bolt on fix and you are on your way , just run them until it can be fixed .
    Point is no cooler corrosion if the hull anodes ( easy to inspect and replace ) are good .
  10. Pascal

    Pascal Senior Member

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    The 6 years aftercooler requirement is a CYA from cat for the most part. On the C32s I run, it s about $25k for both engines... that comes down to about $4k a year. Peanuts (or pennys) in the overall picture. Still a lot cheaper than MAN service.
  11. Capt J

    Capt J Senior Member

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    Plus when you deduct what it would cost to normally clean the coolers in that time period, it's really not that more expensive. I haven't found MAN's to be terribly expensive to maintain either.