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6B 115HP 12V5.9 Cummins

Old 01-19-2017, 12:11 PM
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Default 6B 115HP 12V5.9 Cummins

I have a 2002 6b(non turbo) 115 HP 12V 5.9-M Cummins with zero hours on it. She was purchased as a replacement engine for a boat and then never used.
How can I increase the HP modestly? 165-210 range?
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Old 01-19-2017, 12:13 PM
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In order:

Add Turbo,

If more needed, then:

Change Fuel pump

If more needed, then:

Change injectors.
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Old 01-19-2017, 12:17 PM
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Originally Posted by finsleft258 View Post
In order:

Add Turbo,

If more needed, then:

Change Fuel pump

If more needed, then:

Change injectors.
Don't I have to change injectors if I add turbo? How much will it increase HP? Thanks, Stephen
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Old 01-19-2017, 12:21 PM
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Not worth it. For a little more than what it would cost to get a decent amount of HP compared to displacement, you could find a factory rebuilt 5.9 6BTA rated for 300HP.
It's not as simple as just bolting on a turbo, changing injectors and fuel pump.
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Old 01-19-2017, 12:28 PM
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Originally Posted by Wolakrab View Post
Not worth it. For a little more than what it would cost to get a decent amount of HP compared to displacement, you could find a factory rebuilt 5.9 6BTA rated for 300HP.
It's not as simple as just bolting on a turbo, changing injectors and fuel pump.
Agree, need larger oil cooler, intercooler, maybe alternator, maybe head gasket, maybe camshaft, maybe oil pan size, maybe piston and piston oil cooler spray, etc.
Best way is to do what above said and then run it at 80% of rated load.
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Old 01-19-2017, 12:37 PM
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Yeah that sounds like a lot of work. Does anyone know more about this engine? I cannot find any information regarding a 6b5.9-M 115HP engine. Power curve or fuel consumption?
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Old 01-19-2017, 12:48 PM
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is the motor mechanical or electronic controlled for the injectors. appears to be mechanical but im not that up to par on the cummings
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Old 01-19-2017, 12:49 PM
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These are generator/ pump engines manufactured for constant Duty hence the low hp rating. I can buy them brand new all day long from a local dealer for $2,000 each are you looking to sell this one and what are you asking it.
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Old 01-19-2017, 12:52 PM
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Originally Posted by Mardi-Gras View Post
These are generator/ pump engines manufactured for constant Duty hence the low hp rating. I can buy them brand new all day long from a local dealer for $2,000 each are you looking to sell this one and what are you asking it.
They bought it for $12,000 in 2002 and purchased as a power unit for the boat not the gen. I will sell it but not what you can get them for. The attachment lists it as 6b5.9-P and that it is radiator cooled. This engine is not radiator cooled and it has "M" indicated not"P"
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Old 01-19-2017, 12:53 PM
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Originally Posted by Rolandt03 View Post
is the motor mechanical or electronic controlled for the injectors. appears to be mechanical but im not that up to par on the cummings
Mechanical
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Old 01-19-2017, 01:11 PM
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Wow never knew this engine existed as a 6b I thought they were all 6bt. I bet that engine would have one hell of a duty cycle.
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Old 01-19-2017, 01:14 PM
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Originally Posted by sdcarroll2014 View Post
Mechanical
add on performance will be tough, a turbo would help but with being mechanical you will only be able to add on a small amount. with electronic you can add more power easier. turbo setup alone would be in the $3-5k range to add on i would think
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Old 01-19-2017, 01:21 PM
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You would have to get into the parts lists to see what parts are different between that and a 6BT. As a minimum you would need a turbo and re, set injection pump for more flow. Injectors, valves, cam, pistons, oil cooler might be different, but might be the same too. They don't like making any parts different unless they need to.

You will need a heat exchanger and sea water pump, someone must have stole yours. Or it was meant for keel cooling.
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Old 01-28-2017, 06:30 PM
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What are you asking for this engine. Im interested in purchasing it if the price is reasonable.
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Old 02-16-2019, 07:55 PM
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Originally Posted by sdcarroll2014 View Post
They bought it for $12,000 in 2002 and purchased as a power unit for the boat not the gen. I will sell it but not what you can get them for. The attachment lists it as 6b5.9-P and that it is radiator cooled. This engine is not radiator cooled and it has "M" indicated not"P"
m i think is marine, I worked for Cummins Co. in 70,s, later as a yacht builder I installed many 4b 6b, probs this engine rates as the best bored in the block engine ever made
A lot of my work was rebuilds the 855 engine in trucks, dozers(komatsu) drills, that was a great engine 6x6.5
I,d be interested in fuel usage for the 6b 115 engine plus, is this 6b you have still for sale, ?
I'M ABOUT to buy this boat with 6b

file:///C:/Users/HP/Downloads/altena-family-126-180810.pdf
thanks
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Old 02-16-2019, 10:31 PM
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Your motor has no heat exchanger or raw water pump, so it will need a keel cooler to work on a boat, not a radiator.
At that low a hp rating, and a 2500 redline, this motor could outlast all of us, as long as it’s not overloaded.
If you’re interested in selling it, post it on Trawler Forum, guys over there tend towards the go slow, last a long time school.
BTW, this is likely the most economical motor in its class that any of us has ever heard of!
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Old 02-16-2019, 11:53 PM
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2002? That's not how Cummins sent out their engines then or now. You can add bigger injectors and crank up the pump but as stated, or just get a BT if you are looking for any kind of reliability.
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Old 02-16-2019, 11:58 PM
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Originally Posted by nuffaredy View Post
Your motor has no heat exchanger or raw water pump, so it will need a keel cooler to work on a boat, not a radiator.
At that low a hp rating, and a 2500 redline, this motor could outlast all of us, as long as it’s not overloaded.
If you’re interested in selling it, post it on Trawler Forum, guys over there tend towards the go slow, last a long time school.
BTW, this is likely the most economical motor in its class that any of us has ever heard of!
they are always exp. to convert , heat exchanger, pump, water cooled manifold, adapter plate, bell to suit gearbox, Atlanta Diesel supplies all that,,
I have known them to run 40000 hrs in gensets,however this engine may be a constant spped engine, like 1500 for a fire pump or genset, it'll tell you on the timing casing
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Old 02-17-2019, 05:28 AM
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His post was over two years ago. I assume he’s figured things out by now.
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Old 02-17-2019, 06:07 AM
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Originally Posted by Mardi-Gras View Post
These are generator/ pump engines manufactured for constant Duty hence the low hp rating. I can buy them brand new all day long from a local dealer for $2,000 each are you looking to sell this one and what are you asking it.
What local dealer has them new for 2k ? Your link was to Texas . That's about a core condition price
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