Ebay listing Cummins 370 if anyone looking

[scenarioL113]

There is a listing for a Cummins 370 with ZF220 gears (1.2R...not sure exactly but I assume 1.2:1) Says he has 2 available and they are Brand new and bought from seaboard marine.
$25K each

They sure are pretty...


https://www.ebay.com/itm/144125684999?h ... Sw1Dhg-iHk

[Ironworker]

They are. I wonder if they will fit. I know the QSB's will but not sure those engines will.

[scenarioL113]

Jason put them in Snipe. They are Cummins B 370's not the QSB series so I think they are good to go for anyone lookin for a repower

[Snipe]

Yes frank only thing you would have to change is the aftercooler pipe turbo to aftercooler it will hit the engine box without modifications.
Or at least in my application.

[scenarioL113]

Jason, you been a little quiet lately? How is snipe coming along?

[Carl]

The boats really gotta skoot along with those...

...almost twice the power of my 210's.



Funny 25k doesn't sound bad till you think...

hmm, I need two plus....


then the smile slowly fades a bit. But they would move boat along nicely. A friend has them in his 39 Carver Aft bubble boat and it goes. True very different boats but 31 to 39

[Ironworker]

They are a pretty good deal when considering the transmissions are included in the 25K The gear ratio is not what I'd want plus I want electric troll and shift which are pricey options. Another advantage is they are ready to be shipped not 6 to 8 weeks out! Disadvantage is the engines are 6 years old and no warranty.

A QSB 5.9 380 Recon is now 35K with no transmission. Depending your the gearbox options the ZF220A ranges from 4K to 8K.

[scenarioL113]

The included transmission are 1.2:1. I dont know if that is a good combo for a 31 Bertram. You could use the stock strut but would only be swinging an 18" prop. I am no engineer but I do recall some talk of this on an older thread.

Any ratio will work but the props that go along with the combo may not be the best choice. I think most guys with Cummin 250hp to 330hp are using 1.5:1 transmission.

Taking advantage with the big prop is better from what I recall...but again I am no engineer

[Ironworker]

I was wondering if the gear ratio could be changed on the gears. I suspect it could but this is not in my wheelhouse.

[Tony Meola]

Frank

On a 31 you can turn up to a 21 inch prop. Make up any difference with pitch and cup.

[Carl]

Frank

On a 31 you can turn up to a 21 inch prop. Make up any difference with pitch and cup.

Tony- on some 31’s you can turn up to a 21” prop. Some as others cannot.

My boat came through with 1:1 gas motors, 1-1\4” shafts and 15” wheels. This was the original low angle setup at 10° which was changed to the more traditional 15° angle you refer to that can handle larger wheels.

On mine I swapped gearbox’s, getting rid of the 1:1 for a slower turning shaft with 1-1/2:1. I tried 17” wheels…but noisy and even though 4 blade, not smooth. No hull burn, but was much better with 16” wheels…the largest I’d recommend with the original 10° setup.

[Tony Meola]

Carl

That is a pretty small wheel for a diesel engine.

[Carl]

Carl

That is a pretty small wheel for a diesel engine.

I think 16" wheels would have been ok if going with high revving types of diesels, like Yanmar or Steyr. Not so great with the Cummins. What I was referring to is the tranny swap I did with the gas 440's. I went from 1:1 to 1-1/2:1 then went up in diameter and pitch for more economy and a smoother ride.

When converting to diesel I scrapped the little old struts, gave shafts away to a friend then made myself a pair of beefy SS struts to accept 21" wheels and stay at an 11deg down angle.

[1962 31]

im building a set of 370s for my boat i have one done and ready to go
also building a set of 330s for vince so my second one is going to be a while
ill try and post some pics