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11-08-2014, 02:54 PM
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#1
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Member
City: Hendersonville
Join Date: Nov 2014
Posts: 8
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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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11-08-2014, 03:08 PM
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#2
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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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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11-08-2014, 03:19 PM
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#3
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Member
City: Hendersonville
Join Date: Nov 2014
Posts: 8
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These engines are crusader 4.7L engines
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11-08-2014, 04:47 PM
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#4
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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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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11-08-2014, 05:45 PM
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#5
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Guru
City: Mississippi
Vessel Name: ADAGIO
Vessel Model: CHB Present 42 Sundeck
Join Date: Jul 2014
Posts: 920
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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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11-08-2014, 06:22 PM
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#6
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Member
City: Hendersonville
Join Date: Nov 2014
Posts: 8
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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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11-08-2014, 07:19 PM
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#7
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Senior Member
City: North Kingstown, RI
Vessel Model: Mainship 34 III
Join Date: Jul 2013
Posts: 179
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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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11-08-2014, 07:33 PM
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#8
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Guru
City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
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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.
__________________
Craig
It's easier to fool people than to convince them that they've been fooled - Mark Twain
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11-20-2014, 01:44 PM
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#9
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Senior Member
City: Huntsville, AL
Vessel Name: Sea Note
Vessel Model: Mainship 40
Join Date: May 2014
Posts: 185
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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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11-20-2014, 06:46 PM
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#10
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Guru
City: North Charleston, SC
Join Date: Sep 2010
Posts: 4,870
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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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11-21-2014, 12:59 AM
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#11
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Guru
City: Beverly Hills
Join Date: Feb 2012
Posts: 1,371
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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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