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-   -   MPG for Gas Universal or Atomic 4 (http://www.sailnet.com/forums/irwin/62678-mpg-gas-universal-atomic-4-a.html)

EJO 03-08-2010 03:09 PM

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.:rolleyes:

hellosailor 03-08-2010 03:36 PM

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.

nickmerc 03-08-2010 04:44 PM

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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jjtjr 04-28-2011 07:10 AM

gph
 
!/2 gal/hr at full Throttle

vpardi 04-29-2011 01:14 PM

Quote:

Originally Posted by jjtjr (Post 724819)
!/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.

MarkSF 05-24-2011 06:07 PM

!/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.

Faster 05-24-2011 06:21 PM

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....

MarkSF 05-24-2011 06:27 PM

Quote:

Originally Posted by Faster (Post 733799)
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.

EJO 05-25-2011 09:05 AM

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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