Twin Turbo Big Block Marine Chryslers - 440 M&W Ge

Nice find Joe...6 marine turbo's to my 4 I bow to the king have fun.

Very nice find. I remember in the 80's we heard of a guy with a 454 ski Nautique with twin turbos. I never saw it but one of my ski partners got a ride in it.
He said power was incredible but top speed was limited by porpoising.
Looks like a couple great projects will be on tap.
The turbo kits look to be high quality.

Amen

Admittedly my head has been buried under a rock and work has me going 1000 different directions, but Joe, you just said Green Lake! I miss all you guys a ton, and obviously, I missed that announcement... When is everyone heading to Green Lake???

JoeinNY wrote: I probably need to rebuild a trailer before I can get any of these engines into a test boat as the one that the marauder is on has blown out all 4 of its irreplaceable coil springs.

Joe,
What sources have you checked for the springs? When I rebuilt the TeeNee for the Atom, I used springs from McMaster. Under "compression springs", looks like they go all the way up to 5" dia. and some with some pretty decent load ratings.

Joe,
What sources have you checked for the springs? When I rebuilt the TeeNee for the Atom, I used springs from McMaster. Under "compression springs", looks like they go all the way up to 5" dia. and some with some pretty decent load ratings. [/QUOTE]

They are the confined space conical springs I asked a trailer place and looked online for the usual suspects... in truth the trailer is a piece of junk universal inboard trailer and while I would put maybe 200 into springs for it to keep as a yard trailer it would be money better spent on one of the CC trailers I have needing restoration.

So I been messing about with the RH 440 trying to get it a little closer to correctcraft size and decided to get out the previously designated for the landfill 72ish marauder and see if I can get them making some waves together in time for the summer.   A lot of futzing with hoses so far, but I have the cooling system generally complete and it shouldn't be too much longer now before its in the boat.   After that there is a lot of wiring/fuel system upgrades to do, and a new floor, and some wood replacement for the seats… but hopefully then it will be ready for cruising.

Boat


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New Side view



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New Back View



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Empty Boat



Getting Close

63 Skier wrote: Is there any issue with balance of turbo output? In other words, if one is healthier than the other does it matter at all, or does the pressure balance regardless of which side is putting out more and just delver X amount of air to the carb?

I am not one of them there experts but all they are doing is providing air to the carb box at an increased pressure (sadly also increased temperature) . If one doesn't work at all then it is a leak path for the air being moved by the other and there probably would be little to any boost as a result.   if one is slower or more restricted than the other then the overall boost might be reduced a bit but nothing I would likely notice.    

It Bolts right in

Smithfamily wrote: Getting interesting!!

Seriously can’t wait for a ride in this sleeper.

bwinn wrote:    That ariens looks like a nice workhorse too

That Ariens is about the same year as the boat, and few older than me - 16hp of all hydraulic lifting, shaft driven, mowing, snow blowin, plowing, and rototillin monster -complete with 3 point hitch for moving boats around the shop.   A little worn in the cosmetics and valve train, figure I might clean her up in another 20 years or so when one of us retires.

63 Skier wrote: Ok, might be a foolish question, but that never stops me ...... how does the wet log to up pipe to turbo then out exhaust handle the cooling water?

Not sure I completely get the question but....

This is an insanely complicated cooling system, water and exhaust are not joined together until the last elbows that point down into the exhaust hoses/tubes that will run out the back.   The exhaust components are all jacketed in water but they have dry joints between them and the water travels from one piece to another via a hose in and a hose out.   The elbows under the turbos actually have 2 hoses in and one out. One of the two water pumps (the little one), splits right out of the pump and cools the trans cooler and starboard manifold (enters back bottom, leaves back top) with the other one cooling the oil cooler and then into the back bottom of the port manifold.   The water from the back top of the manifolds then goes to the bottoms of the aluminum elbows below the turbos.   Water from the big pump cools the engine until it is too warm then it is sent back to a t that sends water to the top inside of the same elbows below the turbo.   Water leaves those elbows on the top outside goes to the outside turbo jacket fitting, travels to the inside turbo jacket fitting where it leaves and goes to the fitting on the last elbow attached to the turbos and is dumped with the exhaust out the bottom.   The engine cooling circuit is also crazy but we will omit that except for the in and out for now.