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Ford 9N, 2N & 8N Discussion Forum
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Gallons per hour?

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Short Bolt

09-12-2006 00:57:02




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How many gallons of gas per hour should a 9N use just pulling a 2 wheel hay trailer around the field, and to the barn appx. 25 bales per load
Thanks




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lonestarjeff

09-12-2006 18:10:24




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
Shorty...one of the design goals of the N was to be able to plow a full day(9 or 10 hrs)& be able to get back home on a single tank of fuel. The sales materials claimed a farmer could plow an acre per hour(in 2nd gear)on a gallon of fuel.

Jeff



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Upper Peninsula, MI

09-12-2006 16:32:16




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
S & B. My two 9N's burn just about 1 gal. per hour. I time them and when I have X amount of hours working them, I head in for more gas. This includes plowing snow with a front mount snow blade, discing, brush hogging etc. It always seems about the same. Ron



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Pooh Bear

09-12-2006 09:44:46




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 Another Question. How Much At Low RPM in reply to Short Bolt, 09-12-2006 00:57:02  
How much gas does an 8N use at low RPM, near idle.
Say, 1/8 throttle, just above idle.

And how much HP does the PTO put out at this speed.

Will it hurt anything to sit and idle for long periods of time.

Pooh Bear



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gahorN

09-12-2006 18:32:52




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 Re: Another Question. How Much At Low RPM in reply to Pooh Bear, 09-12-2006 09:44:46  
Pooh Bear, I can't say it's true of these N engines but I suspect it is...that long periods of idling starve upper cylinders of lubriation due to the fact thatin most engines such lubrication is due to crankshaft "sling". Many aircraft engines carry a caution against prolonged idling below 800 rpm, and those engines typically operate at similar rpms as our tractors. (2,000-2500 rpms).



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Pooh Bear

09-13-2006 12:17:31




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 Re: Another Question. How Much At Low RPM in reply to gahorN, 09-12-2006 18:32:52  
Sorry I didn't respond to this before now.
It dropped off the front page and I forgot about it.

I am building a water pumping rig that runs off the PTO.
It's a small pump and doesn't need much HP.
The electric motor for the pump was 350 watts.
I'm using belts and pulleys to get the low speed PTO
up to the 2800 RPM pump speed.
I'm planning on the tractor running at just above idle,
somewhere around 175 to 200 PTO RPM.
And then it goes thru a system of belts and pulleys
to get a 1:14 gear up to run the pump.

I'll get pictures when I'm done.

Pooh Bear

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dlplost

09-12-2006 08:54:06




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
Both my 8N's (a '50 and a '52) average 1 gal. per hour. The '50 has been here for 25 years, and burns 1 gal/hour so accuratey you can tell time by checking the gas in the tank. We've had the '52 for about a year now and so far and it seems to be doing the same.



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D Thomas

09-12-2006 07:30:21




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
Best I can remember I use about 1 1/2 gallons and hour plowing or brushogging in about 2/3 - 3/4 throttle ON AVERAGE with an 8N. I have heard of others using around or a little over 1 gallon per hour ON AVERAGE.



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duey

09-12-2006 07:03:51




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
My guess... it shouldn't take any more than a couple gallons per hour.... but there a ton of variables. How soft are the fields, are they hilly, is the carb set not-too-rich.... Do you run wide open throttle? Use minumum power.... on and on.

It is all cumulative. And 55 to 65 years old.

duey



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Skyhawk Greg

09-12-2006 07:00:56




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 Re: Gallons per hour? in reply to Short Bolt, 09-12-2006 00:57:02  
SB - To figure out the hp required at a given velocity you would take Cr (rolling resistance coefficient)* weight in pounds * velocity in mph / 550. Cr would vary greatly with soil conditions, tire pressure, wheel bearing types, and so on. Once knowing the hp, just take 1/2 pound of gasoline per horsepower hour and then divide by 6 to get gallons per hour. More simply, if conditions were extremely bad, and the 9N was using full power of about 23 hp, it would consume around 2 gallons per hour of gasoline. If conditions were where you were only using 10 hp, then consumption would go down to just over 3/4 gallons per hour.

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