Engine/Transmission (1994 - 1998) need information

[WDaniels]

What I need information on is a Cummins 4b. I am researching on putting the 3. 9 into my sailboat but so far I've not been able to find a 3. 9 with less than 150 hp. What I would like is 85 hp. Is there any way to depower one down that much? It's simplicity and parts that are mostly compatable with the 5. 9 is a huge advantage over the new high rmp engines that are making inroads into the sailboat industry.

I posted here because of the need of maximum input. But if either the moderator or Steve needs to move this, please feel free to do so.

WD

 

[HCannon]

You need one with out the turbo, they are rated about what you need. What is wrong with having more power than you need? Bet a turbo motor will give you 85 hp. cheaper than a non turbo would.

 

[WDaniels]

The diesel engine I have right now has 60 hp at 3000rpm. I would like an additional 25 hp for a little extra poop if I need it. As it's a sailboat and not a plaining hull, I don't need gobs and gobs of hp. My therotical hull speed is only 8. 1 knots. And this boat is heavy, real heavy.

There are two reasons I do not want a turbo. The biggest is that of the heat. I have 4 Rolls L-16 series batteries in the engine room and the extra heat of the turbo would end up destroying the batteries much faster than if I kept them cool. My engine room stays about 85 max. With a turbo, the temp would dramatically climb. The second reason is the noise. If I have to motor for an extended period. It would drive me batty. There is no way the wife is going to listen to that turbo whine for a 2 day motor trip. And neither am I.

The Cummins 3. 9's I'm looking at right now do not have a turbo, are made for the marine market, are only 3800. 00 for a brand new long block without a core and are 160hp. If I could get the hp down to 85 I would be all over that like a duck on a june bug.

WD

 

[CharlieFoxtrot]

160 HP on a non-turbo 3. 9?? The 5. 9 with turbo was 160 HP until like 1994! I realize the marine applications may have more power because they don't have to meet emissions standards, but I'd like to see proof of a 160 HP non-turbo 3. 9. As HCannon said, a 3. 9 NA should be around 85hp.



What engine do you have now? Will the Cummins' weight make your hull less balanced?



I was looking at a small powerboat with a 250 Chevy inline 6 gasser, thinking how sweet a 2. 4L BMW turbodiesel would be in it... Not to mention marine gas is ~$5/gal while marine diesel is just a little more than road diesel.