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Old 12-29-2006, 10:38 AM
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Default whats better inboard VS outboard?

i own a 33 feet boat which i will use as a water taxi, it is for 35 passenger so i'm planning in buying a pair of yamaha 200 hp for strokes for it, do u guys think thats the best option or should i go for an inboard, i hear that outboards are great but after 700 hours u will need to do alot of repair insome cases even changing the power head, in the other side i hear that a disel inboard will work great and wont need to worry that much until i pass the 3000 hours, any sugestion for any particular brad or engine model will be really apreciate.
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Old 12-29-2006, 10:43 AM
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Default Re: whats better inboard VS outboard?

Outboards are great and reliable to way more than 700 hours but if you are using commercially and near shore I would go with a big single diesel inboard.
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Old 12-29-2006, 10:44 AM
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Default Re: whats better inboard VS outboard?

diesel inboard for your use
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Old 12-29-2006, 10:52 AM
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Default Re: whats better inboard VS outboard?

Only issue I can think of with a single diesel is you will loose some manuverability. Single screw inboards do not back up well, I learned this with my Shamrock.
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Old 12-29-2006, 11:07 AM
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Default RE: whats better inboard VS outboard?

Can't answer your question, because there are too many factors, some of which I don't know about, but I can tell you that outboards should last way longer than 700 hours, and even two of them would cost way less than a diesel inboard. There was an outstanding thread on here some time back about diesel longevity, and it concluded that for some applications, some kinds of diesels, if properly maintained, will last a very long time, but for other applications, other kinds of diesels might not. So be sure to do the research if you go the diesel inboard route.

Also steerable power is so sweet....

I would suggest that if you go the outboard route that you go with 4-strokes, which really do shine in the fuel-economy department at the low speeds typical of water taxis.

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Old 12-29-2006, 12:20 PM
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Default Re: whats better inboard VS outboard?

do the latest and lightest materials used in diesels these days reduce their historical longevity or require more in the way of maintenance to achieve a long life?
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Old 12-29-2006, 01:39 PM
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Default RE: whats better inboard VS outboard?

Constant use, such as a water taxi, is better for any engine than occasional use. I have a very good friend who runs a fleet of outboard powered snorkel boats. The boats go out every day and run for about 4 hours. He has found that two strokes in his usage go about 3500 hours. He has been converting to four strokes as the 2 strokes wear out and has several 4 strokes with over 8000 hours on them. He does not have a solid idea yet of what their life will be, but it looks like it will be well over 10,000 hours. That is true for the power heads, but not the lower units. They seem to be about a 6500 hour item.

Diesels have gotten better and lighter with time. The newest technology with the pre-injection makes 'em quieter and smoother than before. We're seeing things like common rail injection and better injectors. The Europe has had engines for years that were not happy on our relatively "dirty" fuel, but now that ultra low sulphur is universally available, we'll see a crop of engines that have not been available here before.

In your application, outboards will give the best maneuverability, and a diesel will give the longest life with the lowest overall long tem cost.
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Old 12-29-2006, 07:05 PM
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Default Re: whats better inboard VS outboard?

The power option will depend on the type of vessel and area you will be servicing. What type of vessel, Mono hull, pontoon boat, etc.? The type of docking situations you will encounter for passenger loading & unloading will be a factor.I used to work for a water taxi operation in Baltimore's Inner Harbor, pontoon boats,often tight maneuvering with other boats,loading and unloading from the bow,docking for pickups by pushing against bulkhead. in these situations I would prefer the agility of outboards, if you intend to load and unload by pulling alongside or docking an inboard might work to your advantage.What area are you servicing?
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Old 12-30-2006, 02:32 PM
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Default RE: whats better inboard VS outboard?

I would try to get a big slow turning diesel (<2500 rpm). We have a cummins common rail in our boat and get good performance out of it. In your case I would think that an engine that is a duty cycle or commercial engine would be best. The new common rail engines are also awesome on fuel at low speeds and idle. We use about .7 GPH at 600 rpm in gear going about 6 mph. Another plus with diesels is torque, especially if you are going to haul 35 passengers. I would stay away from the higher revving engines like the yanmars and volvos, and look into a Lugger, John Deere, or Cummins. Good Luck.
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