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03-12-2010, 07:59
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#1
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Registered User
Join Date: Dec 2010
Location: Vancouver
Boat: 1962 Hunter Sedan 38'
Posts: 57
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How Big Are My Fuel Tanks and How Far / Fast Can I Go ?
So I'm only used to my 1963 sangstercraft 16.5' ski boat burning through its 25l tank in no time at all with its 100hp evenrude from 67. How big do you reckon my fuel tanks are? they arnt to much longer than what you can see i think.
Iv got 2 chevy v6, throttle body injection, 270hp motors from 2001 i think, so what is the gas consumption like on these old boats?
How fast do you think I can go?
And what would be a good speed for optimal fuel economy?
__________________
Never trust a man with a clean workshop
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03-12-2010, 08:07
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#2
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Registered User
Join Date: Dec 2008
Location: ontario canada
Boat: grampian 26
Posts: 1,743
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Not big enough!
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03-12-2010, 08:12
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#3
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Registered User
Join Date: Dec 2010
Location: Vancouver
Boat: 1962 Hunter Sedan 38'
Posts: 57
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well there is 2
__________________
Never trust a man with a clean workshop
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03-12-2010, 08:29
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#4
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Registered User
Join Date: Dec 2006
Location: Seattle
Boat: Cal 40 (sold). Still have a Hobie 20
Posts: 2,967
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Volume of a cylinder is H*PI*R^2. H is the length, R is the radius, PI is 3.14.
John
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03-12-2010, 08:43
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#5
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Registered User
Join Date: Dec 2010
Location: Vancouver
Boat: 1962 Hunter Sedan 38'
Posts: 57
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while that is good to know john, i'm about 400 kms from the boat so i cant exactly go and measure it up. just looking for ballpark figures.
__________________
Never trust a man with a clean workshop
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03-12-2010, 08:55
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#6
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Senior Cruiser
Join Date: Oct 2007
Location: 29° 49.16’ N 82° 25.82’ W
Boat: Pearson 422
Posts: 16,306
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As a wild guess you might get 12-15 kts with the 2 Chevys in a 38' old wood power boat. Not too familiar with gas engines in a boat like that but again a wild guess burn 6-8 gph at fast cruising speed.
Without something to show the scale of the tank photo could not even guess the capacity. I would expect a boat that size would have at least a couple hundred gallons or more.
__________________
The water is always bluer on the other side of the ocean.
Sometimes it's necessary to state the obvious for the benefit of the oblivious.
Rust is the poor man's Loctite.
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03-12-2010, 10:20
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#7
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Registered User
Join Date: Dec 2010
Location: Texas
Posts: 4
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I have a 32'er with two Chevy 350's and it will burn about 20-30gph at a high speed. I usually idle and float haha!
It has a 200 US Gallon tank.
I'm guessing it's moving about 35mph (~55kph)
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03-12-2010, 10:49
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#8
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Registered User
Join Date: Dec 2010
Location: Vancouver
Boat: 1962 Hunter Sedan 38'
Posts: 57
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Im thinking iv got 2 200 gallon tanks, may 150's
__________________
Never trust a man with a clean workshop
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03-12-2010, 10:54
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#9
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Registered User
Join Date: Aug 2010
Location: Naples, FL
Boat: Leopard Catamaran
Posts: 2,582
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My 36' boat is fiberglass and I get .9 miles per gallon. I calculate 800 gals gross estimate assuming 8 feet long and 1.5 ft radius, and two tanks. From the picture lets say +- 30% 600-1000gals. Hull speed around 9 knots, every knot over that doubles fuel.
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03-12-2010, 10:55
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#10
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Registered User
Join Date: Dec 2010
Location: Texas
Posts: 4
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Nice! I was originally looking at a boat like that. Didn't work out tho, but it looks nice.
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03-12-2010, 12:41
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#11
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Registered User
Join Date: Aug 2008
Posts: 39
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How far can you go? We used to say 1/3 tank to get there, 1/3 to get home so leaving 1/3 to play with!
__________________
 Sailbadoften
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03-12-2010, 12:45
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#12
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Registered User
Join Date: Nov 2010
Location: Lafayette, Louisiana
Boat: Ketch, Hardin 45
Posts: 440
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And in todays market: A sailboat will take you further, but a tad slower and it is the journey that is to be enjoyed not the designation.
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03-12-2010, 13:03
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#13
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Senior Cruiser
Join Date: Feb 2006
Location: Highlands, NJ 07732
Boat: Laurent Giles Salar 40
Posts: 286
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I had a similar boat, 1966 37' wood Egg harbor, twin v8's. It had 2 tanks, 145 gal ea. I fitted Floscan to it to check fuel consumption. I saw 22gph/hr/eng at 16kts, never got on plane. Never took boat for an extended drive out again!! It became a dock queen/hotel.
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03-12-2010, 13:16
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#14
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Registered User
Join Date: Dec 2010
Posts: 14
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Quote:
Originally Posted by chris07732
I had a similar boat, 1966 37' wood Egg harbor, twin v8's. It had 2 tanks, 145 gal ea. I fitted Floscan to it to check fuel consumption. I saw 22gph/hr/eng at 16kts, never got on plane. Never took boat for an extended drive out again!! It became a dock queen/hotel. |
Wow my friend that is quite a thirsty gal you have!
Luckily I don't have the same issue, tho I'm not running dual V8's either.
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03-12-2010, 13:27
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#15
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Moderator
Join Date: Mar 2009
Location: Denmark (Winter), Cruising North Sea and Baltic (Summer)
Boat: Cutter-Rigged Moody 54
Posts: 35,007
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Quote:
Originally Posted by chris07732
I had a similar boat, 1966 37' wood Egg harbor, twin v8's. It had 2 tanks, 145 gal ea. I fitted Floscan to it to check fuel consumption. I saw 22gph/hr/eng at 16kts, never got on plane. Never took boat for an extended drive out again!! It became a dock queen/hotel.
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Per engine, eh? That's a ton of fuel!
So 16 knots will cost you 44 gallons per hour, which is almost three gallons per mile. So 290 gallons of fuel, costing $1000, will last you only 6.5 hours and get you only 100 miles. Whew! $10 a mile just for fuel! I can see why you turned it into a hotel.
That reminds of the old Soviet joke -- how do you double the value of a Lada? Fill the fuel tank.
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