Hours per gallon?

[nightstalker]

I bought a (used) 22' Sunbird WAC with a 1994 225 Johnny (carburated). I took it out today for the first time and she ran great. She cruises at 40 and has a top end of 48. Anyone have any idea of how many gallons of fuel I can expect to burn per hour at cruising speed? Top end?<br />Stalker

 

[walleyehed]

Re: Hours per gallon?

HP Divided by 10 for WOT, and divide by 16 for ave. cruise...<br />22.5gal/hr WOT<br />14-15gal/hr Cruise.

 

[nightstalker]

Re: Hours per gallon?

Thanks:<br /> That a lot of nickels per hour.<br />Stalker

 

[waterinthefuel]

Re: Hours per gallon?

That's a lot of engine.

 

[rickdb1boat]

Re: Hours per gallon?

If you cruise at 4000, I bet it's better than that. 15 GPH seems a little steep to me, even for that engine. I would expect no more than 10 Gal per hour.

 

[walleyehed]

Re: Hours per gallon?

The new 225hp DFI on a 20 ft. boat is closing the gap on 11gph @ 4000RPM.......I'll stick with 14-15gph @ 4000RPM on your carbed 225 on a 22ft. Fiberglass.

 

[nightstalker]

Re: Hours per gallon?

Thanks again, I'll see how she fairs at different rpm's over time.<br />Stalker

 

[seahorse5]

Re: Hours per gallon?

If I remember correctly, back in those years the motors had a "sweet spot" of around 3800-4000 rpm, and if propped in the upper half of the range, would burn around 12-13 gph cruising and would deliver close to 3 miles per gallon on that boat. WOT was near 24 gph.

 

[brother chris]

Re: Hours per gallon?

I don't know how any of that works. I just know that with my 16' I get between 4-5 hours use with a 5 gallon tank ranging from medium to WOT. <br />I am pretty happy with that. I can't even imagine 24 gallons/hour

 

[walleyehed]

Re: Hours per gallon?

Bro Chris, you must have a 70hp.....??????<br />Am I close??

 

[rickdb1boat]

Re: Hours per gallon?

Maybe a 25 HP???? On my toon, with a 91' 70 HP Evinrude, I use 6 Gal. per hour at full throttle. About 8 or 9 Gal. per hour, if I cruise at 4000 RPM's or so. So, maybe I judged on the low side, how many Gallons per hour you use with that big motor. Of course, a toon doesn't plane out and has alot of drag.

 

[walleyehed]

Re: Hours per gallon?

Maybe a 25 HP???? On my toon, with a 91' 70 HP Evinrude, I use 6 Gal. per hour at full throttle. About 8 or 9 Gal. per hour, if I cruise at 4000 RPM's or so.

Rick, you got one of the first engines I've ever seen that has less fuel burn at WFO than at cruise......Tell us how that is....

 

[Cricket Too]

Re: Hours per gallon?

walleyehed's formula seems pretty good, seahorse is on track too. I have a 25' HydraSport with twin 2000, 200hp Johnny's and I have a flowscan gauge, and when I cruise between 3700 and 4000 I am reading about 13 gallons per hour, so that 225 is proably a little more. Either way I'm screwed beacuse it's doubled, really wish they were Ficht's.

 

[rickdb1boat]

Re: Hours per gallon?

walleyehed <br /><br />Believe I got turned around a bit.

 

[rodbolt]

Re: Hours per gallon?

hello<br /> yep walleyehed has the formula. works fairly close for both 2 and 4 strokes. regardless of what the salesman says about the 4 stroke 90 outrunning the 2 stroke 115 and doing it at 3 galons an hour. it takes X amount of fuel to make X amount of power. so at the RATED horsepower RPM the motors all use about the same. I run a 30 grady marlin tourney with all kinds of do dads sometimes. it has a pair of 250 yammi's. fuel management says 59.8 gallons an hour for both at 4700. boat only holds 300 gallons or so. the other grady 30 marlin that is an 03 model with a pair of 4 strokes burns 58 gallons an hour at 5000 rpm. so there is not an appriciable difference in the 2 boats. anyway the HP to fuel formula works for WOT .<br /> good luck and keep posting