What diesel in a boat - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 19 (permalink) Old 04-18-2008, 02:41 AM Thread Starter
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What diesel in a boat

Ok, I'm getting ready to start bio diesel production. If all goes well I'm seriously considering swapping out my 7.4mpi gasser for a diesel. The boat is a 27ft sport cuddy that curretly can pull skiers, wakeboarders, etc. So the big question is, what diesel would be a good choice for comparable power, weight and performance?

'04 F250 FX4, CC, SB, Zoodad, Innovative SCT XCal2, 4" MBRP, Airaid intake, 4" Superlift front with 5.5" Fabtech springs in back with stock 2" block delete, 18" predators with 35" Nitto's, Isspro gauges overhead. '00 27' Rinker Captiva Millinium, 454MPI Captains Call exhaust. '06 '33 Tahoe Transport. '03 Polaris Predator 500, K&N, WB pipe, '08 Polaris Outlaw 525 S.
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post #2 of 19 (permalink) Old 04-19-2008, 05:08 AM
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Thats a tough one for me, because I don't know that much about marine motors. But it seems simple and reliable would be the way to go for a boat of that size. Thing is, nothing is simple nowadays. Might be easier to get a boat that already has diesel power and sell that one, or check out boats that have diesel power and see what needs to be done. Good luck. Harry

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post #3 of 19 (permalink) Old 04-19-2008, 07:05 AM
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the Diesel engine will be heavyer than the gasser

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post #4 of 19 (permalink) Old 04-19-2008, 02:44 PM
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One that would bolt in would be a 6.5 chevy. I've never been real impressed with these engines power but I'm sure with the proper mods it should produce plenty of power and they are comperable in weight to the 7.4.

Here's a link to one company providing the 6.5 for marine applications
http://www.marinepowerusa.com/diesel.html

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post #5 of 19 (permalink) Old 04-19-2008, 03:19 PM
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finally a topic on boats.. yes!.. ok.. 27 footer and a diesel wouldn't go together real good because of a number of things.. it's bigger.. heavier.. you won't get as much performance as you can with a gasser.. i mean in jersey.. we dont have diesel's in any boats that are smaller then 32.. but if your still considering it.. theres a company that has a 6.6 duramax out.. they were at merchants spring fling.. ill try finding out excatly who it was for you.. i mean you can get good performance out of a diesel in a boat.. but in a 27 footer.. theres only so much you can do.. plus think about fuel tanks and lines and everything.. just something to think about

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post #6 of 19 (permalink) Old 04-20-2008, 10:07 AM
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The Cummins/Mercrusier is other common package to repowered the vessel and i know Volvo do make them also.,,

both come in sterndrive and inboard verison

typically i know the 7.4 L gas engine in marine trim they can dish out about 300~330 HP range in factory trim set up

there are few diesel engine in that size can be used right along with gas fired units.

and for cummins fans.,, OUI !!!! they do have B series in stern drive unit set up allready : here the B series stern drive unit [ in the pdf ]

and here 320 HP verson [ dang it is not b series but good power package ]

hope that will help ya with some info you are digging up but forewarn they are not cheap at all espcally new marine engines cost are.

Merci,Marc
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post #7 of 19 (permalink) Old 04-21-2008, 03:17 AM Thread Starter
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Thanks for the suggestions.
Anyone have weights of the dmax and the 6.0 powerstroke?
I'm not looking for any performance increase necessarily just comparable. The 7.4 that's in there now is 310hp and with the bravo 3 outdrive it performs pretty well. I don't do poker runs or anything like that. I don't think the bravo 3 will hold up to too much hp. Otherwise there's plenty of room in the engine bay. It's the full width of the boat. (9'1")

'04 F250 FX4, CC, SB, Zoodad, Innovative SCT XCal2, 4" MBRP, Airaid intake, 4" Superlift front with 5.5" Fabtech springs in back with stock 2" block delete, 18" predators with 35" Nitto's, Isspro gauges overhead. '00 27' Rinker Captiva Millinium, 454MPI Captains Call exhaust. '06 '33 Tahoe Transport. '03 Polaris Predator 500, K&N, WB pipe, '08 Polaris Outlaw 525 S.
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post #8 of 19 (permalink) Old 04-21-2008, 03:25 AM Thread Starter
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Chobeeman, I checked out that site. That's pretty much exactly what I'm looking for. Wish they had prices....I think.
Wonder if I could plug a tuner into it and get a little more power if I needed to.

'04 F250 FX4, CC, SB, Zoodad, Innovative SCT XCal2, 4" MBRP, Airaid intake, 4" Superlift front with 5.5" Fabtech springs in back with stock 2" block delete, 18" predators with 35" Nitto's, Isspro gauges overhead. '00 27' Rinker Captiva Millinium, 454MPI Captains Call exhaust. '06 '33 Tahoe Transport. '03 Polaris Predator 500, K&N, WB pipe, '08 Polaris Outlaw 525 S.
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post #9 of 19 (permalink) Old 04-21-2008, 12:50 PM
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Quote:
Originally Posted by FIREBALL
...Anyone have weights of the dmax and the 6.0 powerstroke?...
you can count on them weighing in between 1000 - 1100#. then you'll need to add the additional weight of those items that would be heavier than in their current trim in a p/u (e.g. w/a IC system, heat exchangers, etc.).

i would guess that you'll be adding about 400# than your current 454 setup. 'course, that's w/out your drive upgrades....

Travis
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post #10 of 19 (permalink) Old 04-22-2008, 03:56 PM Thread Starter
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Thanks for the numbers. I run in fresh water only, so I wouldn't need any heat exchangers. I would have to go with an air to water intercooler though and as long as I don't add another 100hp I shouldn't have to do any drive mods.
As far as 400lbs, I don't think that would effect it too much. Right now it runs pretty much the same weather theres 3 people in the boat or 8.
Marine Power USA says there dry weight is 887lbs. Just found a spec that says the 7.4 is 1158lbs.

'04 F250 FX4, CC, SB, Zoodad, Innovative SCT XCal2, 4" MBRP, Airaid intake, 4" Superlift front with 5.5" Fabtech springs in back with stock 2" block delete, 18" predators with 35" Nitto's, Isspro gauges overhead. '00 27' Rinker Captiva Millinium, 454MPI Captains Call exhaust. '06 '33 Tahoe Transport. '03 Polaris Predator 500, K&N, WB pipe, '08 Polaris Outlaw 525 S.
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