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Gas milage, 2x454 vs 2x540

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Old 05-14-2006, 03:46 AM
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Default Gas milage, 2x454 vs 2x540

I usually figure any big block will get 2 mpg cruise and 1 mpg WOT.
So I'm considering a 26 Seebold Eagle w 2x454 and a 38 Scarab w 2x 540.

I'm figuring the Scarab a 9000# boat w 540s is going to burn a hella lot more fuel then the 26' pad V w 454s.
Any ideas or comments?
Thanks
Evan
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Old 05-14-2006, 04:10 AM
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Default Re: Gas milage, 2x454 vs 2x540

The gas mileage factor was "nonexistant" until recently----now that gas prices are redicluous
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Old 05-14-2006, 06:59 AM
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Default Re: Gas milage, 2x454 vs 2x540

It would be more (the 540) but its all relative to the force applied to the right hand .... ..... 454 carbs or MPI ? my 454 mags ..averaged about 12-15 GPH ... that's overall ... idle time ...cruise ...some WOT ...9000lb 311 ... they are out now being upgraded to 509's ...will be interesting to see the difference ......m
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Old 05-14-2006, 10:28 AM
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Default Re: Gas milage, 2x454 vs 2x540

Gasoline consumption is related to horsepower.A certain amount of power requires a certain amount of fuel to make that power.A 454 making 500 hp at WOT for an hour will use 220 lbs of gas/7 =31 gallons of gas.
A 540 making 600 hp at WOT for an hour will use 280 lbs of gas/7 =40 gallons of gas.In some cases like a 525 Merc that has a very rich tune-up could burn more fuel than a 600 or even a 700 hp engine
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Old 05-14-2006, 12:11 PM
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Default Re: Gas milage, 2x454 vs 2x540

Quote:
Originally Posted by JCPERF
Gasoline consumption is related to horsepower.A certain amount of power requires a certain amount of fuel to make that power.A 454 making 500 hp at WOT for an hour will use 220 lbs of gas/7 =31 gallons of gas.
A 540 making 600 hp at WOT for an hour will use 280 lbs of gas/7 =40 gallons of gas.In some cases like a 525 Merc that has a very rich tune-up could burn more fuel than a 600 or even a 700 hp engine

yea ???? well whata you know ????

Scary ......... les see ....80gal x 3.23 = 258.00 ....crap!

so any motor not jetted right is costing $$$ ....
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Old 05-14-2006, 12:12 PM
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Default Re: Gas milage, 2x454 vs 2x540

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Originally Posted by offthefront

so any motor not jetted right is costing $$$ ....
You got that right
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Old 05-14-2006, 01:31 PM
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Default Re: Gas milage, 2x454 vs 2x540

Go to www.boattest.com and find your boat, or as close as you can come. From what a have found, 454s best, is at 2700-2800 rpm's and with twins it's like 1.75 mpg.
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Old 05-14-2006, 03:46 PM
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Default Re: Gas milage, 2x454 vs 2x540

If you are interested in a 26' boat, why not look a something with twin small blocks?
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Old 05-14-2006, 04:11 PM
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Question Re: Gas milage, 2x454 vs 2x540

Quote:
Originally Posted by JCPERF
Gasoline consumption is related to horsepower.A certain amount of power requires a certain amount of fuel to make that power.A 454 making 500 hp at WOT for an hour will use 220 lbs of gas/7 =31 gallons of gas.
A 540 making 600 hp at WOT for an hour will use 280 lbs of gas/7 =40 gallons of gas.In some cases like a 525 Merc that has a very rich tune-up could burn more fuel than a 600 or even a 700 hp engine
I'm not questioning your numbers but I have heard that it takes approx 1 gallon/hour to make 10 HP, so a 500 horse motor would be 50 GPH at full throttle. Maybe this is only true for the over rich factory motors?
I know that this is fairly correct on 2 strokes, as 300X's burn 32 GPH at full throttle.

Also would it be true that if you had a 500Hp 454 and a 500 Hp 540 both tuned correctly that they would both consume the same amount of fuel at WOT?
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Old 05-14-2006, 06:45 PM
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Default Re: Gas milage, 2x454 vs 2x540

Quote:
Originally Posted by Sutphil
If you are interested in a 26' boat, why not look a something with twin small blocks?
I was kind of wondering the reason for twin big blocks in a 26 footer myself.
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