Cummins Marine Diesel Repower Specialists › Forums › All Other Marine Diesels › Re-power MerCruiser 5.7 Horizon MPI to a Yanmar 4LHA-STE 230hp › Reply To: Re-power MerCruiser 5.7 Horizon MPI to a Yanmar 4LHA-STE 230hp

September 15, 2018 at 6:44 pm #37187

Tony Athens
Moderator
Vessel Name: Local Banks
Engines: QSB 6.7 550 HP
Location: Oxnard, CA
Country: USA

If you can find a really good 4LHA 230/240 and set it up 100% right, then you will be able cruise with that model Yanmar and be within Yanmar’s guide lines at where your “gasser” cruises now ( maybe a tad better) , but at 1/3″ less fuel burn……That may also be an important part of your decision too ??

If you really want to CRUISE at 17-18Kts. then you have to up your available and true “CRUISE HP”.. That means, like Rob said — a 6LPA 315 or a Cummins 6BTA 330 or 370 Diamond..

The 4LHA 230/240 is a really great engine, but it has it limits..

Tony