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power question, twin 300 Suzuki's vs 350hp diesel

Old 04-08-2007, 07:10 PM
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Default power question, twin 300 Suzuki's vs 350hp diesel

I am looking at an aluminum cuddy cabin , 29 ft, 8500 lbs dry w/o power, at this point I can choose power.
I really lean toward the twin outboard power, access to shallower areas, handling around docks, beaching the boat , no kicker, flat rear cockpit ,plus it is what I know.
Now the diesel would be a single application with a kicker for trolling, I find that kickers only control a boat this size if the wind is down and everything is perfect.
The obvious reason to opt for the diesel would be for fuel economy I guess.
What is the reality of getting 2.25-2.5 mpg with the outboards at a 30 knot cruise?
What would you do?
Thanks.
Ken
I
Old 04-08-2007, 07:54 PM
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Default RE: power question, twin 300 Suzuki's vs 350hp diesel

What is the weight of the boat? I can give you a decent idea of what to expect from fuel economy if I know the "loaded" weight...

600hp will obviously be faster than 350 hp, thats a given!

Michael
Old 04-08-2007, 07:58 PM
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Default RE: power question, twin 300 Suzuki's vs 350hp diesel

the inboard will out last the outboards.but for shallow water you need the outboards for sure
Old 04-08-2007, 08:15 PM
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Default RE: power question, twin 300 Suzuki's vs 350hp diesel

modunlavy
I figure the loded weight to be around 12000 -12500 lbs, the hull is a 19 degree constant deadrise.
I like the 250 suzuki or Yamaha as well but want the fly by wire controls.
Thanks
ken
Old 04-08-2007, 09:41 PM
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Default Re: power question, twin 300 Suzuki's vs 350hp diesel

normally I'd say diesel but considering your location and diesels tendency to gel at low temps I'd go with the the zukes
Old 04-08-2007, 10:16 PM
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Default Re: power question, twin 300 Suzuki's vs 350hp diesel

Twin 350 hp Yamaha's

Old 04-08-2007, 10:49 PM
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Default Re: power question, twin 300 Suzuki's vs 350hp diesel

Took delivery of a 32' single diesel in Anacortez WA with a bow thruster and it handles great - it's now in MA. I would not worry about temps and diesel since the fuel where you are is treated for it. Aren't most of the serious commercial fisherman up there are runing diesel and in far colder and worse conditions than what you will see. Just in case someone thinks I'm biased, I also have a CC with a 250 DI outboard and like that as well.

D-


D-
Old 04-08-2007, 10:54 PM
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Default Re: power question, twin 300 Suzuki's vs 350hp diesel

I know of 2 people who have a boat very similar to what you described, they tell me they wish they had gone diesel every time they take it out. It's already on it's second pair of outboards.
Old 04-09-2007, 01:30 AM
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Default RE: power question, twin 300 Suzuki's vs 350hp diesel

Dear Sir:
We regret to inform you that at anything over about 9,000 pounds and more than 14 degrees of deadrise, 2.25 mpg is not going to happen with twins. Nice idea. Noble thought. Twelve five and 19 degrees? Be very, very happy if you get 1.8.
Old 04-09-2007, 01:48 AM
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Default RE: power question, twin 300 Suzuki's vs 350hp diesel

Kern is dead on, the four stroke outboards get good mileage, compared to two stroke but can't compare to diesel. Performance is another question altogether...T.R.
Old 04-09-2007, 02:41 AM
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Default Re: power question, twin 300 Suzuki's vs 350hp diesel

Just to give you a frame of reference, my 32 Regulator is probably pretty close in displacement to your boat. It has more deadrise but less windage so the performance should be in the same range. On a nice flat day, running twin Yamaha F250s I am lucky to see 1.4-1.5 nmpg at my 30 kt cruise with a normal load. With the fuel tank down to a 1/4, I have seen 1.6 nmpg. The idea of getting over 2 nmpg with twin outboards is out of reach. Actually, I suspect you would have trouble doing that with a single Diesel too, though you could get a lot closer. Also if you do a lot of trolling or running below planing speed, you should see a considerable low speed fuel economy gain with teh Diesel over the outboards. Don't forget that you will lose about 10% in efficiency going to a straight shaft inboard over outboards from the shaft angle. On the other hand, in the Yukon the fact that you could tap into the cooling system for cabin heating might be another big consideration in favor of a Diesel.

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