ksalmine

https://en.wikipedia.org/wiki/Brake-...el_consumption

There you can find answer why I'm not building turbine boat. (Hope the link show this time...) I like to but it burns too much fuel on low speed. Maybe if put MB OM603 with turbine and drive no wake zones piston powered...

GPH should be very good, as you can see big diesel have good efficiency, over 40%, compared to supercharged V8 maybe 20% or less.... I like to see less than 200g/kwh(0.329 lb/hph) BSFC
It will burn about half of fuel compared original 525EFI, transmission can make benefit, 70mph, long gear on, 1200rpm. Diesels like pushing big torque at slow rotation speeds. mid range torque should be over 5000Nm.
Scania DC16 078A did well on that list, common rail injection helps, but its basically traditional diesel engine. Hope transmash did the job too. But as you can see, the bigger engine the more efficiency.

ksalmine

Army Guide

Turbo version, 1000hp, 1020kg, 212g/kwh (0.350lb/hph) stock, no big deal to get under 200g/kwh, good fuel system, water meth injection, maybe regrind cams. Of course, if using over 2000hp it won't be that good.

thirdchildhood

Great project. Please keep us updated.

Hasn't it been determined that this engine can't live long at tractor pull power levels yet you say that you may be running up to 2,600 hp (525 makes about 540 hp so 540x3=1,600+1,000=2,620hp). Can that engine live at that power level? Personally I'd be happy with 3 525s but gas is cheap here in USA. Good luck with the project.

ksalmine

Triple sterndrive eat lot of power. There are not 1620 prop shaft hp. My transmission run 4. gear like straight shaft, none gear is transmitting power. Crossbox have straigh cut gears running but they are not submerged to oil, just splash or dry sump lubrication. Drives have very small power loss because they are straight shafts. Surface piercing props have also better efficiency.

If this guy telling truth, bravo waste lot of energy https://www.offshoreonly.com/forums/general-q/204124-525-efi-prop-horsepower-2.html

Tractor pulling guys run few seasons without rebuild at 70psi boost and over 3500rpm, stock internals exept valve springs makin 3500-4000hp. Sure they broke sometimes and every engine is overheated after every run because they dont't use radiators..... Boat engine should be happy below 2400rpm,and 40psi boost. 2600hp is only 1.1hp/cid or 67hp/litre. FPT N67 550hp is 82hp/litre. Transmash is quite low tuning rate on that power level. Should be ok IF I can manage heat rejection.

Tom A.

Good luck with the project!
For years I have been wondering if and when someone was going to play with a big diesel engine and split drives. I'm in heavy highway construction and around big diesels all day. It makes sense if the parts and components can all be built strong enough.

thirdchildhood

525 efi prop horsepower Cool thread. I resurrected it. I honestly am clueless when it comes to what you are doing and will watch and learn. Looking forward to this! Good luck.

boostbros

thanks for the chart on engine efficiency i,m stunned the wright 18 cyl 3350 making 3800hp is more efficiant than most modern engines probaly including the merc qv4 1650 , that would sound pretty wild in a boat!

kidturbo

The overall diesel record is held by the late Fabio Buzz from way back in 1985 at 277.5KM/H. But that was in a hydroplane.

There is a more recent production Vee out of the EU, Italy I believe, that supposedly does like 97mph according to company website. Then there is video of a couple hopped up canoes in Asia with diesels that look stupid fast, no noted speeds. But as for single engine Vee, the little 21' Warlock I sold few years ago is still the fastest one I know of. Ran 84-86mph on straight diesel fuel in fresh water, saw 92 in salt water, and documented an even 80Mph on 100% Biodiesel.


It also achieved 7.5-mpg at 45MPH, with an average of 5-mpg overall by pin and paper calculations on tank refills.

Cool project. Best of luck with the build.

999JAY

Transmash is a fantastic engine and easily capable of 2500hp in a marine application and engines are plentiful in mainland Europe so having a few on hand for spares will be worthwhile.
Moving to the Bosch pump over the rotary will be a great advantage.
I looked at doing a very similar project years ago using the same engine but ended up building a cat instead with twin 800/1000hp Seateks Arneson/BPM surface drives.
Good luck great project it will be a great success when complete.

999JAY

Did you know they come from the factory in a supercharged and Turbocharged variant?