50hp Force Fuel Consumption

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blueoval78

Seaman Apprentice
Joined
Jul 19, 2010
Messages
43
I took a 29 mile trip on the weekend with my 1988 Bayliner Capri 1500. The boat has a 50hp Force on it. There were 2 adults onboard, 2x 6.6 gal tanks of gas, fishing rods, tackle box, cooler and miscellaneous small items. I cruised at 80% WOT most of the way (20 MPH) with the exception of getting on plane a few times at which point I ran at WOT.

I ended up burning approximately 8 gallons of gas for those 29 miles. My question is, does this sound like the right mileage for this type of setup? This is my first year of boating and I am still learning a little every day. I never realized how thirsty boats were!
 
hoofbite

hoofbite

Seaman
Joined
Aug 18, 2010
Messages
53
Re: 50hp Force Fuel Consumption

I burnt up about 23-25 liters on a 45km trip. I'd say your about right. Of course comparing to mine who knows depends sometimes. But there is no doubt these ol 2 strokes burn the gas.
 
jerryjerry05

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,927
Re: 50hp Force Fuel Consumption

Sounds good for a 50hp and a load.
The way to check these motors is with a tach.Peak performance is about 5500rpm at WOT.Any less or more means the wrong prop, timing off.Poor compression.
Check the spark/comp.Then the rpm at wot.Post what you find.J
 
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blueoval78

Seaman Apprentice
Joined
Jul 19, 2010
Messages
43
Re: 50hp Force Fuel Consumption

I'm running a 13.5 pitch prop on my boat and by myself, can hit 28 MPH at 4500 RPM's at WOT. With the load I had on Saturday, I could hit 25 MPH at 4200 RPM's at WOT. I know I'm a little under my peak range but I tried an 11.5 pitch prop and it actually lowered my top speed although raising my RPM's by 500.
 
puddle jumper

puddle jumper

Captain
Joined
Jul 5, 2006
Messages
3,830
Re: 50hp Force Fuel Consumption

That's about the same as mine at about the same speed. We use about 6 gallons in a 10 mile round trip plus about 3-4 hours of trolling on the same trip. I will agree its not the most fuel efficient way to get around.
 
dkonrai

dkonrai

Senior Chief Petty Officer
Joined
May 9, 2009
Messages
719
Re: 50hp Force Fuel Consumption

i can troll for about 8 hours on a 6 gallon tank of gas, and at wot, maybe 30 miles. i have a 50hp, on a 14 foot bayliner
 
Frank Acampora

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: 50hp Force Fuel Consumption

My 50 Chrysler is on a 10 foot go-fast tunnel hull. last weekend I burned 5 gallons in one hour at 5000 RPM and full throttle at 45 MPH. Given that I slowed to turn the thing, I traveled about 40 miles with that 5 gallons. That works out to 8 miles per gallon. but then again, it has a 14 1/2 pitch prop and only weighs about 550 with me in it. Still, not too shabby.
 

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Desertsky

Seaman
Joined
Aug 25, 2010
Messages
73
Re: 50hp Force Fuel Consumption

I don't know how far I actually ran but I got about an hour of full throttle and about 1-2 hrs of slow running out of mine on a Capri 1400 with me and wife aboard.

One thing i see is that if you are running high throttle and not planing, you will be using a lot more gas. I can get mine on plane at about 1/2 throttle. I don't have a tach on it so I can't help you with RPMs.
 
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blueoval78

Seaman Apprentice
Joined
Jul 19, 2010
Messages
43
Re: 50hp Force Fuel Consumption

I'm planing; though I need full throttle to get on plane and then I can back off to about half. One question, I am just learning about the fuel recirculation system on this motor - ie, the reed valves. If these are malfunctionning could they cause excessive fuel consumption? Also, if they are malfunctionning, could the motor lack power - not cutting out but just generally feeling doggish?
 
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