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Go Back   SailNet Community > General Interest > General Discussion (sailing related)
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  #11  
Old 12-23-2011
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I run my A4 at 1500 RPM as it just stuffs the stern at more RPM to go a tiny bit faster while i have not done exact it is way under 1 GPH

To go from 5.5 to 6.5 knots most likely doubles the fuel burn as thats the point were it stuffs the stern with a 24' W/L
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1981 J24 Tangent 2930
Tommays
Northport NY


If a dirty bottom slows you down what do you think it does to your boat
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  #12  
Old 12-24-2011
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I use a dipstick, with a volume conversion chart.
I don't have a fuel guage.
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Old 12-24-2011
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My fuel gauge is an old batten. I normally watch my hours and start checking around 20-25 hours which is about half a tank. My old 2gm burns around 1.25-1.3 liters per hour @ 2400-2600 rpm.
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Old 12-24-2011
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I agree that Boasun's SFC estimate of 0.6 lb/hp-hr is a bit high. I would estimate something like 0.45 to 0.50 is closer. But the big thing to keep in mind is that you are typically running at FAR less than rated power. Power requirements vary approximately with the cube for a displacement hull. So reduce the speed by 20% and you cut the power (and fuel consumption) by half (0.8x0.8x0.8=0.512).
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Old 12-24-2011
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32' boat w/a 4ft draft full keel 10' beem 35 hp. kubota 4cyl w/ a hurth 125 2.73to1 ratio w/ a 19r11 three blade prop. gross weight 13-14000# burning less than 1/2 gal. an hour on flat water.

I think there are alot of factors that will influence the amount of fuel usage beyond just the engine size and operating speed.
even the "freshness " of the bottom job would effect it.
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  #16  
Old 12-25-2011
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Moyer Marine sent out an email not long ago about a nice little upgrade for our beloved Atomic 4s. How about a new carburetor jet that reduces fuel consumption to 1/2 to 2/3 a gallon per hour! I haven't had the chance to follow up on this yet, but I'm looking forward to it.
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Old 12-25-2011
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Lean running engine

Quote:
Originally Posted by SkywalkerII View Post
Moyer Marine sent out an email not long ago about a nice little upgrade for our beloved Atomic 4s. How about a new carburetor jet that reduces fuel consumption to 1/2 to 2/3 a gallon per hour! I haven't had the chance to follow up on this yet, but I'm looking forward to it.
If engine runs lean, could burn exhaust valves. I would leave as is.
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Old 12-25-2011
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Quote:
Originally Posted by LakeSuperiorGeezer View Post
If engine runs lean, could burn exhaust valves. I would leave as is.
Just about everyone I know that uses an A4 also uses a product called Marvel Mystery Oil, which is a top-cylinder lubricant that has been around for more than a half-century. It pretty much prevents valve burning, while at the same time aid in seating and sealing the valve and valve seals. You can still buy this product in most automotive stores and it is added to both the fuel and crankcase. I'm convinced that this product alone is responsible for keeping most A4s in good running condition, and at the same time helps boost fuel economy.

Cheers,

Gary
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