HELP CUMMINS 5.9 700hp

[salstrip]

Well here is a nice little project for all of the guys who know how to upgrade a Cummins dodge 5. 9 305 engine. Help us

We are looking to build several offshore race engines to 700hp using the Cummins common rail deisel 5. 9 305 hp 2003 model(we have secured 2 new ones at this stage) as a base . We propose to use a raw water cooling system(boats race for 1 hour maximum 10 time per year ) so corosion is not a problem (we currently use the 525 mercury race engines 525hp WE FILL THEM WITH COOLANT AT THE END OF EVERY RACE)). The air intake would be cold air direct cone over the turbo style from a 6/92 detroit, we would have a raw water cooled intercooler built (max water temp 27c) . We would also need to manufacture a water cooled exhaust manifold ,and change the turbo to a water jacketed one any ideas on the size of the turbo required ? . Any other ideas on what we may need to do to to get upto our required 700 HP,any weaknesses in the Cummins that need looking at ie valve springs etc. I beleive the 305 are no different to the 325hp internally(we could not find new 325hp engines ). Any and all information would be very helpful .

Regards

Conn

 

[CumminsBu]

FordCummins.com: Home has 305HP engine. I don't know how many they have on hand. But you can give them a call.

Cummins does build marine engines. I sure you can use all the part off one of these. Marine Live-Cummins Marine

 

[KLockliear]

Well, Cummins makes 5. 9l marine engines, which likely share manifold patterns with the pickup engine. I'd start there.



Marine Live-Cummins Marine



As far as differences, the 305 and 325 engines have different injectors and pistons, as well as J-jet configs IIRC.

 

[salstrip]

Thanks

Hi Guys thanks for the posts,we pretty much have the manifolds and cooling and inlet sorted ,just wondering what sort of mods we could do to the engine itself so it did not self destruct we would like to show how good the cummins product is compared to an old petrol V8 ,ie what type of valve springs we should change to ,do we need to change the cam ,injectors ,what would be best ,turbo flow or turbo type for this much hp . We are purchasing these units from Ford Cummins . your tips would be invaluable

Regards Conn

 

[BothellDiesel]

Twin CP3 pumps, Bigger injectors, I don't know much about water cooled turbos... ... ... ... ... ... ... ... ... . These engines are going to be running at Max for the whole race huh?



Schaeffers Supreme 9000 or 7000 Oil

 

[betterthanstock]

I would definately run 6 EGT probes on that engine.

Read up on all the posts about melted pistons, stuck injectors , and such.



EGT Gauges from Aircraft Spruce

 

[regelitsu]

I would imagine that you would need to change the cam since you are going to have to spin the motors at a higher RPM, and make power. I would also run a good set of studs on the stock head gasket. To give you an idea, I have a pair of Yanman 440's (5. 8L) and they come with 14 mm head bolts from factory. They are an almost identical setup to the Cummins. Valve springs all around to support the high sustained RPM's and the throttling required during a race. Valve seats on the exhaust side might also be nice, I have dropped them on my Yanmar but I guess there is not enough lift on the cam cause I put like three hours on the motor with dropped seats. The turbos should have a water cooled exhaust housing and capable of moving some good air over 3000 RPM's. Harmonic balancers from Fluidampr would also be something to consider. Nothing here is required, but I know what those motors go through. Dry exhaust would also be a nice addition to let those motors breath. I hope Bravos are not going to back up those motors. A pair of good trannies (ZF?? or Twin Disc??) and some ASD-8's and you got yourself a good race boat.

 

[regelitsu]

As far as turbo size goes, umm, I know that Seatek used to experment with twins on their diesels and they made some good power. I guess the question is if you go to big, you might have a problem getting on plane. Is this a V-bottom or a Cat? I guess this is the primary reason they went to twins, to have good bottom end spool and keep the EGT's low.

 

[MA2LA]

Don't the early CR motors have issues with droping valve seats when pushed hard?

 

[salstrip]

Race boat

Thanks guys for the posts,:-laf

the boat will be a 39ft cat twin hull ,about 6500lbs,twin Dodge Cummins engines ,crash boxes,and a set of gear interchangable surface drives . the races last for an hour and its full on ,throttling up and down all the time ,from 90mph upto 160mph.

Thanks

regards Conn

 

[Vaughn MacKenzie]

Running sustained high HP is a much different scenario than drag racing, sled pulling, etc. In order to run a lot of fuel and keep it cool I think twins may be the only way to go as suggested.



For internal engine workover definitely go with Marine pistons with teflon coated skirts from Cummins which also have steel lands for both compression rings. Might also have the piston bowls coated. I think a cam upgrade and some porting may help too. Balance the internals for smooth operation & go with head & main bearing studs, maybe O-ring the block.



I think to optimize this kind of setup it'll take some trial and error, since all the years I've been on this board this is the first time someone has looked at an application like this. It would be interesting to see how much HP a 5. 9 could make on a sustained basis with the right parts.

 

[johncameron]

I'm also thinking that 700HP at the flywheel is only about 560 at the wheels in truck world.

 

[regelitsu]

39 ft..... an MTI??... Vaughn hit it on the head with the marine pistons and coating them. Those guidlines are more or less along what you may need to sustain that power. At the end, it may only me like making 500-600 and the wheels for a truck, but it is a totally different application. Getting there is not that hard, but sustaining it may be. Many people here are having great success with the stock gasket and I do not think that you will be able to spin that motor more than 4000 rpm cause if electronics, unless someone here has any more suggestions. Surface drives are nice and crash boxes are the only way to go for racing. This is a real nice setup from what I can see. I know of someone that put two Yanmars in a 39' MTI. I heard it broke 100, but did not have 1400 hp. I am real interested to see how this goes, it can be done and will work. Good luck.