[Will]

OK thanks. I agree with your assessment of the design, just wondering how long might one see “carbon” after installing the manifolds.

I’m very interested in the wet manifold conversion, wish it was 6 months ago. I think I watched a video on your site on this.

Will they still make the horsepower in the ranges they do now? I think mine are rated at 660hp, or so says the computer. I generally don’t need much speed, but it’s nice to be able to scoot when those pop-up storms hit in the gulf in the summer.

[Will]

Well, for what its worth, I decided to try some things after reading about what all hasn’t worked on this forum and other forums before I put new manifolds on it which I plan to do eventually anyway. I just had the jethot 2500 ceramic put on the exhaust manifolds and exhaust side of the turbos on twin qsm11s (Had the manifolds machined true in a jig) and put back on w/ Remflex gaskets, and some custom heat shields I had made from a specialty shop — so far I’m not certain the heat shields are even needed w/ the ceramic coating on there, but then you wouldn’t get to buy a 2 set of $1100 each Cummins heat shields every few years. I took 4.5″ of pitch out of the props based on your articles and by getting feedback from others w/ the same boat. We are still sorting out a few voltage and gauge issues and other things so have not spent much time above 1100 rpms so far, but heated up more than enough to set the fuchs 762 on the turbo-to-riser connections. After running a few hours you can still get right up on those exhaust manifolds w/ your hands and w/ very little radiant heat. I did bring it up to about 2100-2200 rpms last test run and kept it there a few minutes, jumped 40,000lbs up on the plane to 35mph w/ some throttle left, still almost no heat coming from exhaust or turbo, so at this point I disagree with you about helping with the heat in the engine room. I do agree the engine compartment needs more ventilation and we are ciphering on the best way to handle that.
I posted a separate question about how long would one expect it to take for a slip joint to “soot”/seal up. I got some soot initially but it is difficult to tell where it came from and seems that it may have quit. Just haven’t been able to get the boat back out in decent conditions to run it longer and harder. We’re going to clean it up and do some more test runs to look for exhaust leaks, but unless there’s a reason not to ceramic coat those manifolds and exhaust side of the turbos, I’m a believer at this point and would be inclined to ceramic coat new manifolds when I get them. I’ll keep you posted. Thanks for the reply, And thanks for the help with the Aftercoolers and Heat Exchangers a few months back, y’all were great.

[Author]

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