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On Thu, 12 Oct 2017 08:34:00 -0400,
wrote:

On Thu, 12 Oct 2017 00:33:16 -0400, wrote:

Diesels 'usually' last longer than a gas job and are much more economical on fuel. But what you save in fuel costs probably don't over ride the massive up front expense of the whole unit. Bad trade off IMO.

===

Increased range because of greater fuel economy is the most common
reason for justifying the higher cost. Diesels use almost 50% less
fuel for the same power output, and have higher low end torque.

Which also allows bigger, more efficient props running at lower RPM.

I was reading an article somewhere else that said the economy might
not make the difference in less than 10,000 hours. They also assume
higher maintenance cost, particularly with a belt drive. I am curious
how the belt is working out on the 7 Marine.

===

Here's a real world example of the diesel vs gas engine trade off. Our
old Bertram 33 had a 320 gallon fuel tank which seems like a lot but
it had 454 gas engines which burned 35 gallons per hour. Cruising
speed barely reached 18 knots on a good day. Doing the math, you come
up with a safe fuel range of less than 140 miles, not enough for
offshore canyon fishing in the NY area. Converting to diesel engines,
the burn rate drops to about 20 gallons per hour, and cruising speed
climbs to 23 knots or so, for a fuel range of around 300 miles. That's
a big difference in the capability of the boat and has nothing to do
with the price of fuel or reliability.

That must be one heavy sommich if 2 454s only get you 18 MPH.
The guy around the corner has a 36 (Donzi I think) with 2 250s on it
that will cruise in the 30s burning a combined 25-30 GPH or so (a
whole lot more at WOT tho)

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