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800hp at 3500rpm is 1200tq. That’s gonna be pretty hairy and hard on parts.
I remember hearing years ago that boats are hard on crankshafts, almost mandatory for them to have a forged unit in place. Not sure if that's just an old wives tale or not.
Ya 800hp at 3500 is a good way to fold some rods and push water. Why didn't he go with a BBC seems that would have been a much better platform for building a stump puller.
The small turbos will be hard to tune also, see EGR. I agree 800hp @3600 might not work with factory sized components. The main rod overlap will not be good with all of that stroke and the heads will be on their way off the block hahahaha.
I agree with the BBC comment but what a weight difference!
The compressor map for those turbos doesn't look like they'll be happy at 800 HP.
Any experience with the 4.1 crank in an aluminum 5.3 block? Rigidity becomes an issue with rod/stroke ratio in aluminum blocks.
So the engine needs to flow 80 lb/min at 3 bar / 43psi, at 3500 RPM.
80 pounds of air is 28,000 liters/minute at sea level, 9,333 at 3 bar.
5.3 liters at 3500 RPM is 9,975 liters / minute.
So then the question is whether the exhaust output will drive those turbos to where you need to be on the compressor map. Not sure how to do the math on that, but my Subaru has a slightly larger turbo (52 lb/min) making 2.5 bar at 4000 with 2.5L, and that turbo is a couple generations old, so I'm guessing it'll work.
Wait. One more question. Did I get the math right?
Hi TG, sure MOST Air Boats (LS powered) use a Gear Box (1 : 2 prop reduction) at a cost of $2000.00.
SURE the cost of a proper Twin Turbo with Turbosmart WG is about 2X that amount.
The Air Boat weight is 1000 .lbs with operator.
The Gear Box Weight is 100 .lbs OR 8% less weight with a DD. ( including the TT's)
Thus Dave, Water Thunder, has a good reason to create a DD Boat.