dutchman wrote:
The Yanmar would be a very big step back.although not familiar with the marine engines though. PS whats wrong with the fine Italian built CRD already in them.
How would the Yanmar be a step back? When the company I work for put in a bid to power the Navy's RHIBs we opted to use our 520 commercial stern drive backed by a Yanmar diesel. We put them up against the current contract holder, Mercury Bravo and a Cummins diesel. Both diesels were of the same displacement. The Cummins weighed a 1/3rd more then the Yanmar. Because of the weight issue we picked up 10 knots more top end speed with similar fuel economy. We won the contract showing that the little guy can still compete with the big boys (Mercury represents 80% of the sterndrive industry).
I can't disclose any more details because anything more in depth would either result in me being sued for breech of confidentiality or I would be arrested for treason. When it comes to homeland security the Yanmar was the top choice.
That isn't to say the Cummins B-series is a bad motor. No it is a great motor for what it was designed for. Let us not forget that this motor was originally built in the late fifties to power sprinkler or irrigation systems. It is simply too heavy for anything else.
I have personal first hand experience with 4 friends that own Cummins B-series equipped Dodge 3/4 and 1 ton pickup trucks. None of them has had any reliability problems outside of the automatic transmission (don't get me started on that). The main problems they have is in the front suspension due to weight. Lots of premature ball join and shock failure. The springs sag. Tires wear fast. I haven't seen those problems on my friend's and his parents Diesel GM's (both 6.5 turbo and Duramax) or my 6.2 1/2 chev. I never saw a problem with the powerstrokes (except the new 6.0 liter and its fuel glitches which is to be expected of a new motor.
Sorry for the long post but I hate to see a good engine like the Yanmar get sold short.
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'02 KJ Sport V6 4x4
3/8" Clevis lift
Rusty's 2.5 lift
255/70/R16 Fleet Farm All Terrain (yes they work)
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