Awesome boat ! neat rigging too.First of all I hope Mike will forgive us all for wandering away from the thread title where he was looking for info on FPT. As always happens with these diesel threads different product gets mentioned but the discussion is always interesting and we all learn something from it.
To answer Tommy, Jeff and anyone else interested my experience with the Yanmars has been nothing but good. It serves my purpose of pushing a heavy boat at speeds up to mid 70's which still allows me to do poker runs but cruises comfortably at about 68 MPH all day long with a 400 mile range. Would I like a package that would give me another 10 + MPH ? You bet. For those not familiar with what I am running, it is 50' Nor Tech Vee with trip Yanmar 480's hooked up to Arneson ASD - 8 drives. My 9 ft beam allows for the three Yanmars side by side. The Cummins ( which I agree with Joe is a great motor with support network ) are too wide to fit 3 in. As far as FPT, I have only recently became aware of their offering and will follow along to see how they do in the months and years ahead. I wish them well. I expect for a long time to come tho, a supporting dealer network here may be an issue ?
Anyway I will get back to answering Jeff and Tommy's questions. Jeff as far as smoke goes it is no issue at all. I have learned that when backing into a slip as long as you do not throttle up as we do with our gas boats, there will be no smoke. It's hard not to touch those throttles when you have a bit of wind or tide action going on but I have learned how to manage it nicely and occasional use of the bow thruster is just the ticket.
Tommy was interested in operating costs as compared to gas and gave the example of 500 Bulldogs. Never had those in any of my boats but I can offer a comparison with my previous 50 NT with trip 850's which may not be a good comparison but may show why I like my current setup better.
Top speed - 850's = 97 MPH 480 Yanmars = 76 MPH
Cruising speed 850's = 75 + Yanmars = 68 - 70 MPH
Range with same 400 gal tank 850's = 200 miles Yanmars = 400 miles
Consumption at cruise 850's 2 gal / mile Yanmar's 1 gal / mile
Time between rebuilds 850's = 300 hrs when new and every 225 - 250 hrs max after that. Yanmars 440 hrs at this time and still very strong. Could be in thousands of hours but who knows?
Yanmar repair history in first 440 hrs - Starboard motor - never been touched, center motor small leak in fuel oil line, and port motor rebuild power steering pump. My costs are measured in the few hundreds of dollars as compared with a staggering amount that would reach 6 figures on some years with the 850 gas. With the 850's in addition to rebuilds every 12 to 15 months due to high usage I would need either new headers or repairs every 2 years, transmission rebuilds, # 6 rebuilds and I can go on and on. I have none of those issues with my current setup. I just go boating !
Could you give some more info about the propellors /pitch and diameter ,and ratio gearbox etc ,,and what engine rpm,s total weight of the boat ?