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#1
11-15-2010, 11:26 AM
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Cummins 6BT
I have the opprotunity to pick up a Cummins 6BT engine. Will this engine fit in my 1977 23' inboard Seacraft without to much trouble? I know the Yanmar is the motor of choice, but the Cummins is what I have to work with.
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#2
11-15-2010, 03:42 PM
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Re: Cummins 6BT
This will be too big and heavy for a 23ft.
At best you are looking at a 4BT for that size boat.
__________________
Glen 1996 23ft Contender 08 Yamaha 250 HPDI 1965 13ft Cacci craft skiff with 20 Hp tohatsu 4 stroke 1992 20ft Shamrock Predator (Hard Top) 351 FWC PCM Repower SOLD First boat: 1988 17Ft Shamrock Open 3.0 Mercruiser RWC 140hp Traded
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#3
11-16-2010, 07:57 AM
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Re: Cummins 6BT
The Cummins 6BT weighs over 1100 lbs with the flywheel and marine transmission and produces 160 hp normally aspirated and 250 hp with "factory" turbocharging in a Dodge truck, but can easily be made to produce 600 hp with supercharging and reprogramming.
The Cummins 4BT weighs about 850 lbs. with flywheel and trans, and produces 140 hp normally aspirated, 210 hp with "factory" turbo, and with aftermarket supercharging and chip reprogramming can easily be made to produce 450 hp. The Yanmar 6LP weighs 930 lbs with flywheel and trans, and produces 260 hp normally aspirated, 315 hp with factory turbo, and can be "factory" supercharged to 470 hp without reprogramming. (I've read claims of 650 hp, but I personally believe that's exaggeration for bragging rights.) The Volvo D4 weighs 1230 lbs with flywheel and trans, and produces from 180 to 300 hp. The D6 weighs in at 1440 lbs, and produces OEM rated 330 to 550 hp. The Steyr 6H weighs only 730 lbs dry, and produces 260 to 290 hp. Unfortunately, it's the most expensive of the lot.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft  (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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#4
11-16-2010, 01:02 PM
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Re: Cummins 6BT
If the Cummins does weigh in around 1100 lbs with gear then I believe that you'll be fine being that the engine is in the center of the boat. My big block chevy with outdrive weighs around that and it's in the very stern.
__________________
Steve B 1978 23ft SeaCraft Seavette 502HP ZZ502 Mercruiser TRS Drive-Sold-UGH! 1998 28ft Carolina Classic 7.4 Volvo Penta Duo Prop
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#5
11-16-2010, 10:28 PM
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Re: Cummins 6BT
A 4bt can be made into a real powerhouse without affecting reliability
__________________
Thank goodness that in the scheme of things you are broke, powerlesss and inconsequential, because with the shortsighted alternatives and idealogy you have you'd be much worse than those you complain about.
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#6
11-17-2010, 09:51 AM
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Re: Cummins 6BT
Thanks for your comments. I just have access to two 6BT's and was hoping I could make it work. The 351 Ford engine I now run is getting tired and I am considering all angles before repowering the boat.
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