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Allis Chalmers Discussion Forum
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wd question

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Joe Werner

10-25-2007 11:46:00




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me and my grandpa both have wd tractors. his is a 1948 model and mine is a 1950. we use both of them to do hay in the summer. One thing we noticed is mine is harder on gas then his. My tractor tractor has more of a throatier exhaust sound and is louder.also my tractor wide opens has a lot higher rpms then his does. my wd has has the 13 size tires and his has the 12 size. they both have the same engine blocks. both tractors run good. I was wondering if my tractor might of been bored out to a wd45 size engine. or maybe the governor was just speed up? does any one have any ideas why the one tractor use more gas then the other? thanks joe

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Texas Denny

10-28-2007 07:36:40




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 Re: wd question in reply to Joe Werner, 10-25-2007 11:46:00  
I had a WD that had the 4 1/8 cylinders in it. It made a much deeper sound and had a lot more power. It may have had higher compression pistons, too, but I didn't check that when I had it apart than my regular WD. That WD sounded a lot more powerful even than my WD-45. My experience with use was that the two tractors were about the same in horsepower. Never paid much attention to the RPM (didn't have tachs on either) or try to gauge gas consumption. But those high compression 4 1/8 pistons do sound throatier and more powerful and they are! The advertisements claimed 20% to 25% more and I believe it based on my one experience with one.

Also, when I was in high school, my dad put 4 1/8 cylinders in his two WC's. Prior to the change, we pulled a 9' disk in second. After the change, we could easily pull it in third. I believe we could have pulled a three bottom plow instead of 2 but my dad wanted no part of that. He said the tractor was designed for two and that was it.

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wdTom

10-25-2007 18:14:16




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 Re: wd question in reply to Joe Werner, 10-25-2007 11:46:00  
In the parts book there are 3 different governor springs listed. A 1400, 1600, and 1800 rpm, (Think I remember the rpm nos.) Older tractors may have a lower rpm spring. If one of the tractors was made to run on "tractor fuel" it will have lower compression pistons. And then there is the overbore thing that would add a little power, but probably not too much. And as you said, maybe a 45 "kit" was installed. You never know with a 60 year old tractor what has been done or what engine or parts have been installed. From what you say I would suspect the low compression pistons maybe and maybe a lower speed governor spring. Tire size will make a difference ins speed and power. Bigger tire will be faster, but with less power, like a higher gear.

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old

10-25-2007 13:37:44




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 Re: wd question in reply to Joe Werner, 10-25-2007 11:46:00  
Could be lots of reason for one to use more gas then the other. Engine condition, carb setting and or type, timing, and also what may have been done to the engine at one point in time. Sort of like taking 2 cars or trucks of the same year and engine size etc and one will git better MPG then the other. To many little things that can make a big difference. Also depends on what your doing with them. Say if your pulling the baler and hes raking the hay or cutting the hay his will not be working as hard as your will be. Also depends on if you both have the exact same machines or they are different also

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ohio

10-25-2007 13:37:42




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 Re: wd question in reply to Joe Werner, 10-25-2007 11:46:00  
It might have a 45 crank, or it might have 4 1/8" piston/sleeves. The timing might be retarded, too. That would make it sound lumpier and use more gas.



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