fuel consumtion mercruiser 454 in a zt280

[senator-holland]

what is the fuel consumtion on a 454 in a checkmate zt 280? in a hour?

and with a 24" prop what will the top speed do?


i used to have a 5.7L mercruiser senator. and a day waterskiing was 100 euro. 70 liter gas with a 100 liter/30 gallon gastank

the gas prices are something like 1,8 euro per liter= 5 euro a gallon overhere. so the main question is to keep it running on gasoline or to rebuild it on LPG.

there is a 280 on the internet which is located in the mid west wich i am interested in. they are asking 38000 dollar for a 280 of year 1998.

 

[Big Red]

Stock engine ball park speed 63 mph It all depends on how hard you run your boat how much fuel it will burn. A 454 in a boat that size will get double the gas mileage when compared to a boat that size with a 5.7 in it.

If you are talking wide open running for one hour your engine will blow before you run out of fuel.

 

[remlinger]

Regarding gas consumption....you assume the worst and you do'nt worry about unless your making a really long trip on the water and you need to fiqure out where to refuel. On my 21' with a 5.7 liter in it I can go weeks if I'm just getting out a couple of times and not running hard. But when water skiing, I've burnt thru 30 gals in a day.

 

[dcg9381]

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Best case fuel consumption on that boat is going to be right at 3mpg, probably around 25-30mph. That's about 10 gallons per hour.

A 24P prop sounds steep to me. I'm running a 23P on a 23.3 foot Glastron 454 (385hp) - The CheckMate is longer, but it's probably a heavier boat also. A stock 454 is 300-330 hp. A 24P may be too much prop.
The best way to judge is to get a GPS of top speed and RPM at that top speed. This will indicate if you can use more prop pitch or not.


Gasoline is approching $4/gal in the states also. I don't know what the cost of LPG is and I've never seen a converted boat. I do know that LPG doesn't have the same amount of energy as gasoline and you'll suffer a further decrease in fuel economy, so consider that if you decide to convert.

Best case, if converting to LPG, raise your compression to get more volumetric effiency.