Anyone notice in the last page of pics theres a 210 in the foreground? All that work he's gotta be an MB guy.

He should have used LARGE intercoolers?

How about taking .030" off each piston crown, lower the CR a bit? They'll be happier with a little less compression running wide open all the time.

RT

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The engines are not built for that application. NFW are they going to last that long, I'd be shocked if they saw 500 hours. Heck they probably already have 250k miles on them. I would love to see some perfomance data on that boat. I can't imagin its a hot rod, thats a lot of glass that those things have to push around.

The installation and the work on the rest of the boat is quite nice.

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2016 Corvette Stingray 2LT
1969 280SE
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lots with 6-71s, run 'em flat out forever

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Bill

'82 300SD 195K
'84 300SD 199K

A company called Peninsular marinized the GM 6.5 diesel. Not the most stalwart engine to start with and they found out that the factory 21 to 1 CR caused the pistons to start scuffing/galling the bores after 24 hrs. of continuous operation at 80% load. They reduced the CR to 18 to 1 by having AM General build their pistons with the pin location slightly higher. This was a simple way to lower compression and it seems to have worked as they report no further issues after this change. They also use a large non-wastegated turbo in the marine applications. The street turbo is designed for low end torque not high rpm continuous duty.

Given that the 617 is also a 21 to 1 engine it would seem reasonable that the same issues may be possible in the same type of scenario. A slight drop in CR may enhance longevity in long duration at relatively high power settings.

Since a boat has almost unlimited cooling capacity it would also seem prudent to use large water intercoolers. Its just pumps and plumbing, right? A larger turbo would probably be another reasonable change for the same reasons stated above. I don't see how either could hurt and likely would help.

That said, the installation and fabrication appear first rate. If its all DIY the man is quite talented.

RT

__________________
When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K