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Old 04-18-2011, 07:32 PM
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Default Cummins 220 hp 6 cylinder v. Yanmar 230 hp 4 cylinder

Looking at 30' mainships that come with one of the four: yanmar 170 hp, yanmar 230 hp four cylinder (4LHA-STE) cummins 220 hp 6 cylinder (6BT5.9M) or cummins 250 hp four cylinder (4BT).

I rode on the one with the 250 4 cylinder cummins but it had a lot of vibration at idle speed (and we have a lot of no wake zones).

Also, the specs showed each engine reaching within 1-2 knots of same cruising speed. Can that be true with the 170 hp?

Any advice on engine to choose? Low vibration at idle speed is important to me.

Thanks
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Old 04-18-2011, 08:29 PM
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I would pick the Cummins 6BT engine and invest in some high quality isolating engine mounts. It will shake some at idle RPM. Upside is engine longevity and lower cost of parts.
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Old 04-19-2011, 02:33 AM
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The four cylinder diesels are prone to shaking just above idle; I don't really think it matters which brand.
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Old 04-19-2011, 05:05 AM
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The 4BT has a reputation of being a "vibrating" engine albeit a good engine. Of the engines listed, I'd take the 6BT w/o a 2nd thought.
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Old 04-19-2011, 05:12 AM
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Another vote for the 6. Are we talking single engine, full displacement boat or twin engine semidisplacement?
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Old 04-19-2011, 05:38 AM
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The Cummins 6B (6cyl)
The engine will give you thousands and thousands of trouble free hours.
Almost zero vibration vs any of the 4 cyl engines.
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Old 04-19-2011, 05:49 AM
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The 5.9 Cummins has prover over the years to be one of the best! I couldn't guess how many of them are on the water and road still doing their jobs. Parts are easy to get and cost a lot less than most too. Yep, I have one and love it.
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Old 04-19-2011, 06:05 AM
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1) 220hp 6B is pretty much bullet proof, plus no inter cooler to mess with
2) 230hp Yanmar is also a very exceptional engine
.
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1043) 4b Cummins, had a few friends with these, total mess.
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Old 04-19-2011, 06:40 AM
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Cummins all the way, I deal with a lot of heavy equimpent, the Cummins motor is by far the most reliable motor on the market, day in and day out these motors get abused and keep on ticking.

With some very minor tuning you can pull more horsepower out of them.
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Old 04-19-2011, 07:02 AM
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I've installed a few of the 6bt Cummins 210HP in commercial fish boats. First was in the 1980s when they were new on the market.

One went 8000+ hours in a trap boat with a guy who took excellent care of his equipment but also wanted good value out of his stuff. It was still running when removed but getting tired. Owner hired me to install another new Cummins 6bt 210. That's about the best recommendation I can give for the engine.

I've never seen any of the Yanmars you mention in a commercial fishing boat.
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Old 04-19-2011, 07:32 AM
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And now Cummins offers a 480 hp version of the 5.9 block. Imagine the longevity you should see out of a new 220 hp version of that same block?
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Old 04-19-2011, 05:31 PM
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Cummins 6B all the way. I have a pair and they do not vibrate at idle (or any other speed for that matter).
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Old 04-19-2011, 05:42 PM
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Thanks for all the info. I have never owned a diesel boat and only one boat before. Looking in the $50k range so I am limited and therefore the smaller and newer mainship 30 seems to what I'm leaning toward. I would rather have a sedan with a diesel but is difficult in that price range. I like plenty of other boats in my price range but they all have gas engines.

Objective for now is good economy and reliability. Any recommendations welcomed.
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Old 04-19-2011, 06:08 PM
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Single diesel
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Old 04-19-2011, 06:11 PM
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Single engine and I think semi displacement. 30' Mainship Pilot. Speed 13-14 knots cruise, 17-18 max
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Old 04-19-2011, 11:05 PM
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Got no argument with the 6BT at 220hp, but the 230hp Yanmar is a very good engine and may fit a little better in the same engine room. All things being equal I would take the 6BT, but if the Yanmar was going to be easier to service I would be equally happy going that way.
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Old 04-19-2011, 11:28 PM
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I have twin 4bt in my boat 150 hp a 250 hp is a 4bta not as reliable as a 4bt you can learn more at boatdiesel.com 4bta is aftercooled
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