What parts do you want?

if its making more power at 4200 rpm vs 4700 what would be the point of going up that much more? just for additional prop speed ?

We are better off running lower rpm. The engines are the most efficient at there torque peak which is around 2700 rpm. The hp peak is around 3200 and would not use much more fuel so that is where we had planned on running the engines for long distance. Basically after it has boost and is over 2000 rpm if it is full throttle the injectors are open the same amount of time each stroke so as rpm goes up you are using more fuel per given time. We did not end up with as low of a gear ratio as we thought it was going to have so now the debate is do we turn them more rpm and burn more fuel weight or do I build an overdrive box and lower the rpm which will mean we will not need to carry as much fuel weight to make up the difference for the weight of the overdrive box? With the overdrive box the engines will be loaded harder but will be closer to there torque peak and have a lower EGT which is better on the engine, but were not sure how much power the overdrive will scrub off and it is something else that could have a problem. You are always better off keeping it simple, anything you add in a system is something that can break.

We are still trying to find "bigger" props to get the rpm down mainly from lower slip numbers since you cannot get any more pitch then we are running at 40's.

I have FLO-SCAN modules in the boat but did not have the nema2000 backbone all done so they were not showing up on the screen to see what we were burning, but I will hook them up before the next run so when were testing we can tune for the maximum fuel efficiency.

:D Please be very careful if you test at Havasu. All of the center pod guys cry about how "Hella rough" it gets out there........
Sure hope these motors work out for you. Thanks again for sharing this build with us.

Industrial is building the new exhaust for the boat but were not sure if it will be done with enough time for me to go out there and install the engines and test before I have to leave for the Miami boat show. I will update once I head out there.

I have not been on here in a week because I was sick. Here is a video of what it was like when I ask Tristan for a bowl of chicken noodle soup.

Thats funny :drink:

Why not Lake Mead? Isn't it closer to Salt Lake City?? Or is it still at too high of an altitude??

We debated on lake Mead and lake powell. The problem with powell is the close part to salt lake city has nothing around it for a "city" if we need anything, and it is as far from that point on Powell to Havasu as it is from Salt lake city to Havasu for if we decided to do more testing. The bigger part of powell that has a city is about the same distance as Havasu. Lake Mead is a little closer then Havasu but I have never been out on lake mead and do not know the lake (where to go, water depth, ramps, ect.) At Havasu I know the lake, and there are "people" there that we can get parts from if we need them, or help working on something, ect. And I may leave it there at Havasu till the poker run if the testing goes good. If we tested at Mead or Powell I would still have to haul it to Havasu to leave it for the poker run.

I'm not going to have enough time to go out there and test it before the Miami boat show so it will be 3 weeks till I go back out there to put the engines back in and go run it.

I had no idea that Tristan had a sister. Amazing they have exactly the same demeanor. LOL

The engine compound turbo piping is done. They are putting heat wrap on the exhaust side and painting the cold side piping and I am flying back out there to Salt Lake City this weekend to put the engines back in and go test run the boat probably next weekend. Once we get the engines mounted in the boat we will have to make new exhaust from the turbo back since it has changed locations.

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