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Old 11-08-2014, 03:54 PM   #1
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Smile Mainship 40dc fuel mileage

Seriously looking at a Mainship 40 dc, with twin 450 crusaders in them, and was wondering what kind of fuel economy one could expect from these engines at both cruising speed (8-10 Kts. and flat out), presuming on a calm sea. Any help is appreciated.

Les
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Old 11-08-2014, 04:08 PM   #2
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Do you mean 454cid/330hp crusaders?

Going to be pretty hard on the fuel. Hull speed at 8kts, guess about 3gph each. Flat out most gas engines make about 12hp/gph so that is like 27gph each. Don't go there!! 10kts is past hull speed, don't go there either. Good candidate to cruise hull speed on one motor.
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Old 11-08-2014, 04:19 PM   #3
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These engines are crusader 4.7L engines
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Old 11-08-2014, 05:47 PM   #4
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Never heard of a 4.7 Crusader. Do you mean a 7.4? That's a 454.
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Old 11-08-2014, 06:45 PM   #5
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Yep, a 454 is 7.4L - I have one in my 1978 Chevy Big 10 truck - would be faint at the thought of two of these in a boat running flat out - it would surely move and sound great, but would drink gas like flushing a toilet!
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Old 11-08-2014, 07:22 PM   #6
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yes it is a 7,4 L 454 crusader engine! Fingers and mind sometimes don't co-inside.
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Old 11-08-2014, 08:19 PM   #7
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I would love to move up to one of those. Find one with the twin 6354 Perkins diesels. Your wallet will thank you.
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Old 11-08-2014, 08:33 PM   #8
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I run a single 350 gasser. Below 7 knots she sips fuel. Over 5,000 RPM she passes everything but a fuel dock. Heck of a lot of fun and sounds great though, can't put a price on happiness but Shell Oil company tries.

Twin 454's wouldn't scare me off but I don't pay attention to the gas card bill when it shows up, just pay it.
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Old 11-20-2014, 02:44 PM   #9
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Captcrunch, ski is close. I have 88 model with 2100 hours. Took 160 mile trip halloween weekend. My flow scan was showing pinch less than8 GPH @ 12.5 MPH. Same approximate milage @ 8 MPH taken from the garmin gps. The boat was re-proped in past and increased milage somewhat by PO log notes. We love our mainship river system travel primarily. You could choose worse.
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Old 11-20-2014, 07:46 PM   #10
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For a trawler, I would seriously try to find one with diesel power. Not only will operating costs be less but diesel fuel is inherently safer than gasoline. This is important if you're sleeping and spending a lot of time on the boat.

Diesel engines typically go much longer than gasoline engines before major service is required.

Just my opinion of course, but something to think about.
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Old 11-21-2014, 01:59 AM   #11
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Gasoline engines ok if you don't plan on doing any long range cruising. Yea the speed, noise and vibration for some is a turn on. we did a 220 mile round trip cruise with a boat that had twin 350's, they burned up near $500 in gasoline and the vibration almost caused a mutiny from the 1st mate. We quietly cruised the same distance at about $100 of diesel. Fuel prices have turned 95% of the boats in marinas into dock queens, most of these boats where powered for gasoline when it was a dollar a gallon or less.
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