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GALLONS PER HOUR 9.9 4 CYCLE

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cat78
1st Mate

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34 Posts

Initially Posted - 02/12/2005 : 15:30:32

HAS ANYONE MEASURED THE GALLONS PER HOUR FOR A FOUR CYLCE 9.9 ON A C25. IF THEY HAVE COULD THEY GIVE ME SOME KIND OF FEED BACK. I'PLANNING A TRIP THIS SEASON AND I WOULD LIKE TO HAVE AN IDEA OF WHAT MY CRUISING RANGE WOULD BE WITH A FULL LOAD OF FUEL.

THANKS
DAVE
PASSING WIND C25

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sweetcraft
Admiral

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USA
816 Posts

Response Posted - 02/12/2005 : 15:50:45

Yes, I would like a ball park figure too. Have a 4 cycle now and the 10 hp 2 cycle figured 1 gal per hour which gave a safety margine, 12 gal fuel (2 gal tanks) was 12 hours at 5.5 knots. What's a estimate all you 43 cycle cruisers use?

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aeckhart
Master Marine Consultant

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USA
1709 Posts

Response Posted - 02/12/2005 : 15:57:29

Dave,

That may be something you'll have to figure out by taking your boat out loaded up and motoring around. Someone here might be able to give you a rough guess, but it will be for their boat and the conditions experienced during a specific cruise. My 9.9 Evenrude 2 stroke gets 6 miles per gallon on flat windless conditions,less as the wind and chop build. Each boat and the way it is handled is different. I think the results you get will be much more accurate if you work it out on your own.

Al
GALLIVANT #5801

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Dave Laux
Captain

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318 Posts

Response Posted - 02/12/2005 : 16:01:35

Got what you need,
Cat 25 wing clean bottom,
4.3 knots .9 SL less than 1 quart/ hour
5 K 1.1 SL more than 1 and 1/4 quart but not much
6 K 1.27 SL 1/2 gallon+/ hour
6.3 K 1.34 SL 3/4 gallon/ hour This is WOT
all with 9.9 Yamaha four stroke high thrust
These are good numbers for calm water no significant wind
They can easily double or more for rough with 15 to 20 on the nose.
Dave

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Lightnup
Master Marine Consultant

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USA
1016 Posts

Response Posted - 02/12/2005 : 18:17:46

For what it's worth, I just completed a 160 mile trip with my 8hp 4-stroke Honda on my C25 and used 4/10 gallon per hour at roughly 1/2 throttle.

Steve

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JimB517
Past Commodore

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USA
3285 Posts

Response Posted - 02/12/2005 : 21:01:29

when you can sail, motor sail, and pure motor on a longer trip, I figure 15 miles per gallon overall. Last summer I went 323 miles on 15 gallons (about 1/4 time pure sailing, the rest motorsailing).

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lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts

Response Posted - 02/13/2005 : 18:11:05

On my last San Juans cruise, I averaged about 0.5 to 0.75 gallons per hour on the Honda 10. This motor was built in '79 and looked rather well-used when I got it, and probably had a fair number of hours on it, amking it probably less fuel efficient than the new Lean Burn models. Also, I was towing a 10.5' dinghy the whole trip, which cut my speed about 1.25 knots, so I know I was using heavier throttle settings than I normally would. I can't wait to see what my new Yamaha T8 can do; it's reputed to be one of the most fuel efficient sailboat kickers available in the 8~10 hp class. I've heard that in the not-too-distant future, Government emmissions control mandates may require even small outboards like ours to switch from carburetors to electronic fuel injection, which would result in even more fuel efficiency (although this would probably add $500 to the purchase price!). Actually, I don't see how EFI would be practical on an outboard under 50 hp. For one thing, you have to have full-time hookup to a battery to provide electric power for the system, and many owners of small outboards are using them on dinghys and fishing skiffs that don't have batt5eries, or even electrical lights. The most fuel efficient speed for a Catalina 25 is somewhere around 4.0 knots, which you can get with 1/4 throttle on most 8~10hp 4-stroke outboards, at a fuel consumption rate of around 1/3 gallon per hour.

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JimB517
Past Commodore

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USA
3285 Posts

Response Posted - 02/14/2005 : 12:19:31

Larry, one of us had better change our signature photo!!!!!!

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Dave Laux
Captain

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318 Posts

Response Posted - 02/14/2005 : 12:57:30

Your outboards are on diferent sides (among other things) thats enough to tell them apart. Dave

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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.