Id be willing to bet the same boat with arneson drives and the two different motors would run the same.

Check out SoCal Diesel. They can build a Dmax that will run circles around Banks. Call MPI for twin turbos, MDE for the stand alone ECM, and PPE for the fuel system. SET up right these are 800-1000hp motors that only wiegh in at 850lbs.

BTW I'm new here, but I have been around the block more than once with the Duramax.

It could also be that both boats actually weight pretty much the same. Its hard to trust published weights of boats or engines.

For example, diesels are generally weighted empty. Put in the oil, and all the coolant in all those heat exchangers, along with all the required support equipment (pumps, cables, engine mounts, ...) and the weight is an awful lot more. One person told me that when in the boat floating, he found that Yanmar 480 installations weigh about 500 lbs more than their published figures. While on paper they look just barely heavier than blown big blocks, installed its a very different story.

So maybe maybe Nortech builds lighter than Eliminator, maybe the Yanmar+ASD weight a bunch less than Cummins+NXT ... Lots of possibilities to explain a few mph.

In our 42' Fountain the Yanmars with tranys weight in at 1450lbs. each, and the lighting ran 78mph while the race boat ran 88mph. the MTI cat in the middle of the picture is also with Yanmar power.

Aren't these the same people that IMCO use?

At 1,000 hp they will not live, the engine is not large enough for that amount of reliable power. Drag motors are not marine motors and I think there is a good selection of "Marine" motors out there there its just no manufacturers that are geared towards the performance market.

If some of the diesel manufacturers out there would increase their displacement, the selection would expand greatly and performance diesel boats would be a lot more common.

The motors will live. Marine engines get an excellent break in the cooling department, that is something drag racers dont get. The engine's rotating assembly can handle it. A big blocks crank is puny compared to a dmax. Diesel engines dont have to make big torque( which is what breaks parts) they can be tuned to make good hp with low tq, kinda like a gas burner but better:eek: After all the engine does not know its a diesel.

There are stroker kits available to increase displacement(7.1L). Cooling is the biggest problem on land, that shouldnt be a problem in water. High EGTs melt pistons in high performance, big boost Dmax's. A water to air IC and water to oil oil cooler will take care of that problem.

As of right now the Dmax is the easiest diesel engine to build power with. Dont even bring up yanmar or cummins I have been down that road. The perfomance market for diesel engine is young. Not many people know the requirements of a diesel performance build IMO.

I doubt that IMCO uses them. A properly built Dmax runs around 35k and thats if you have a good core. The only things changed are: rods, pistons, crank(in the stroker case), heads machined, cam ands it if'y at that the stocker is pretty damn good, and studs all around.

Dart and some these big aftermarket companies need to cast a block for the dmax in bigger displacements. Mahle already builds oversized slugs. Maybe a stiffer block so we can turn 5K rpms, right now the crank tries to walk at that rpm.

The biggest plus IMHO is the quiteness of diesels. I have a dmax in an old wellcraft. It only does around 85mph, but it is soooooooo quite, you can only hear a slight turbo whistle. Much more comforable than hearing a cammed up, blown big block roaring in the background. My wife likes that part the most.

Wolford - tell us your name, who are you since you've been down the block a few times?

Prove yourself, because to me you sound like you have an agenda?

What drives, props and gears etc are on that wellcraft to make it go 85 mph - I'd like to be educated?

Your getting the Duramax to live at 1,000 hp for how long? What rpm and in what application? Who's headers you using?

There are a lot of people out there trying this same thing and the rotating assm has to changed from centered rods to billet and the same with the crank. Everyone says 500 hp is the max on the factory lower end.

Duramax has a lot of charm, but no one has built one yet and shown it. People have been promising this for years now and nothing has come of it.

35K for a 1,000 hp motor is a good price, if it can live in a boat for 3-400 hrs. Gernades aren't worth spit as the labor and rebuilds cost will more than the boat.

The Duramax engine can be purchased new for 12-13K so getting a used engine should not be a concern. Banks is one of the authorized resellers of the Duramax engines.

My name is Wolford:lolhit:. I dont have an agenda. I own an aerospace and defenese machine shop (a BIG one). I'm not offering my help, cause I could care less on what motors you run. I'm saying it can be done. I dont have all the answers I wish I did. It is my dream to build a 35' cig with two dmax's. Right now I dont have time to fool with it, business it good.

72C with extra clutches and machine work by me, #3 speedmaster drive again with work by me, and 3 blade cleaver prop. Motor makes around 600ish hp. Don't know cause I havent dyno'd it, nor do I care too. Its a 26 foot boat BTW.