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Old 12-06-2011, 10:25 PM   #21
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RE: 4 cylinder or 6 cylinder?

More than you probably*ever wanted to know about a V6.

http://en.wikipedia.org/wiki/V6_engine
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Old 12-07-2011, 05:02 AM   #22
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RE: 4 cylinder or 6 cylinder?

There are lots of 9 cylinder slow-speed diesels.
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Old 12-07-2011, 10:02 AM   #23
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RE: 4 cylinder or 6 cylinder?

Thanks Rick; these are larger, industrial use diesels?
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Old 12-07-2011, 10:50 AM   #24
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RE: 4 cylinder or 6 cylinder?

I would stay with the 3208 personally but that was not our question. Those engines in the NA version are good forever if all of their vital signs are still good.

Also, the 6 cylinder Cummins was available as an NA engine producing 115hp I believe???? Does the Cummins Reman division sell these??? Or do you need more power?
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Old 12-08-2011, 07:58 AM   #25
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RE: 4 cylinder or 6 cylinder?

Quote:
Baker wrote:
I would stay with the 3208 personally but that was not our question. Those engines in the NA version are good forever if all of their vital signs are still good.

Also, the 6 cylinder Cummins was available as an NA engine producing 115hp I believe???? Does the Cummins Reman division sell these??? Or do you need more power?
*It is my understanding that neither the 4B or 6B (non turbo versions) are available from Cummins Remain. The boat cruises at 2 GPH which should equal about 30 to 34 HP depending on who you believe. The 4B at 80 HP would have been enough to do the job with some to spare.
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Old 12-08-2011, 09:13 AM   #26
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RE: 4 cylinder or 6 cylinder?

The commercial trawler in Everett rebuild the engine in place/frame which they take to Alaska running 24/7 for days.* So why are you concerned about doing a rebuild in place which would cost 1 grand per hole.* So for 20 grand you could rebuild it twice.* Besides most failures are the engine bloke but what hangs off them.** If your 671 need a rebuild I would have it done in place.
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Old 12-09-2011, 04:16 AM   #27
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RE: 4 cylinder or 6 cylinder?

"If your 671 need a rebuild I would have it done in place. "

Not really,

An "inframe" can be done in place , new bearings , cylinders and pistons and gasket set is possible.

A rebuild requires the block to be cleaned , surveyed , line bored for the crank and cam, the crank and cam ground (if needed)

Usually 2 sometimes 3 inframes can be done before a proper rebuild is required.
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Old 06-26-2012, 09:50 PM   #28
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Old thread - new question

I recently looked at a trawler with two 4 cyl Lehmans. They seemed to run a lot rougher and louder than a single 6 cyl. Do ya'll think that that is characteristic, or just a badly set up pair of 4's.
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Old 06-26-2012, 10:48 PM   #29
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With all the usual things being equal the more the cylinders the smoother w some exceptions concerning some crankshaft configurations and some cylinder configurations such as V types. Go w the six.
Also generally speaking the fewer cylinders per displacement the more torque and the greater cylinders per disp the more the maximum power.
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Old 06-28-2012, 07:04 AM   #30
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As I will be doing much of the work myself, the engine install would be under $20K

A DIY engine swop can be done for half that or less..

If you want the 6 look for an International DT 360 or 466 at the wreckers , both mechanical and electronic injected are cheap.

For better resale , I would go to the John Deere TRACTOR guy. Avoid the stupid priced marine folks.

A couple of times a year JD sells factory rebuilds ,with NO core trade in required!

The 80 hp 4 cyl would be ideal, and carries a SAE std bell housing.

Match it to a Twin Disc rebuilt , and for well under $10K you get a commercial (not yachty rated ) power plant.

Run the numbers the existing tranny, might work , might not.

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