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post #1 of 9 Old 03-08-2010 Thread Starter
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MPG for Gas Universal or Atomic 4

Can anybody give me an estimate from experience how many miles per gallon I can get from a Universal or Atomic 4 gasoline 30 HP engine running at say 2,000 to 2,200 rpm.
I'm pushing a 32' 10,500 lbs sailboat with 6.7 hull speed.

I just bought this boat and need to move her 80 miles not knowing if I can sail her due to prevailing winds and only have a 24 gallon gas tank.

Any estimate will be appreciated. I know there are many of these 30 HP inboard in 31' plus sail boats out there and somebody must have figured this out. Previous owner can't tell and/or doesn't know.
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post #2 of 9 Old 03-08-2010
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Moyer Marine is "the" name in A4s. See Atomic 4 Fuel Consumption - Moyer Marine Atomic 4 Community
where they discuss less than one gallon per hour.

Having a clean hull, clean correct prop, and not pushing top speed will all make big differences for fuel consumption in any boat.

I'd also suggest taking a shorter sea trial, maybe two hours or a half day, to shake down any possible problems before running off 80 miles. Measuring fuel consumption is something you could do during that time as well.
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post #3 of 9 Old 03-08-2010
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On my Pearson 30 with an A4 I can get 25-30 hours run time before I become worried about low fuel with a 20ish gal tank. Prop condition is a huge factor as is bottom condition and sea conditions and wind intensity and direction. I would not count on miles but hours as the way to mesure fuel consumption.
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post #4 of 9 Old 04-28-2011
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!/2 gal/hr at full Throttle
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post #5 of 9 Old 04-29-2011
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Quote:
Originally Posted by jjtjr View Post
!/2 gal/hr at full Throttle
I think that 1/2 gal per hour is a little optimistic at full throttle. I estimate consumption at just less that 1 gal per hour. A lot will have to do with how well your engine is tuned and your engine rpms. A good speed for me is around 6 knots at about 2200 rpm.

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post #6 of 9 Old 05-24-2011
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!/2 gallon per hour? Geez, I'd better rip my Universal Diesel out and put an Atomic 4 in. I'm using a gallon per hour right now.
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post #7 of 9 Old 05-24-2011
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Our son got about 1 gal/hour on a Ranger 29 with an A-4..... seem's pretty normal.

MarkSF... Really? our 4 cyl 42 HP runs about 2 litres (1/2 gal)/hour....

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post #8 of 9 Old 05-24-2011
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Quote:
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Our son got about 1 gal/hour on a Ranger 29 with an A-4..... seem's pretty normal.

MarkSF... Really? our 4 cyl 42 HP runs about 2 litres (1/2 gal)/hour....
Hmmm well I've been doing a lot of idling and cold starts so that might distort it. Need to measure on a longer cruise.
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post #9 of 9 Old 05-25-2011 Thread Starter
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Thanks for your answers, I just sailed the 81 miles (13 hrs) so I didn't have to worry about gas.
I did find out last season that at 2400 rpm or so (6 knts in my 32'ter) I'm using a little less than 1 gallon (more likely 3/4 gallon (2.85 liters)) per hour which was a lot less than my previous power boat with the twin V-8's with 4 barrel carburetors on them. Sailing is great again.

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S/V "Sailmates" 1973 IRWIN 32 Classic

I want to live and sail forever, so far so good[/SIGPIC]
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