D 15 HP
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=148069
Printed Date: 05 Jul 2025 at 2:29pm
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Topic: D 15 HP
Posted By: ACinSC
Subject: D 15 HP
Date Posted: 01 Mar 2018 at 1:45pm
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Is the HP the same for gas and diesel ? I'm thinking I saw somewhere that a gas Series 1 is a little higher . THANKS !!
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Replies:
Posted By: Stan IL&TN
Date Posted: 01 Mar 2018 at 2:12pm
In the Nebraska tests the gas was a little higher than the diesel but so was fuel use.
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1957 WD45 dad's first AC
1968 one-seventy
1956 F40 Ferguson
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Posted By: SteveM C/IL
Date Posted: 01 Mar 2018 at 3:08pm
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I think it was typical for a gas to have a little more HP but the diesel had more torque. In the end they performed about the same.
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Posted By: DrAllis
Date Posted: 01 Mar 2018 at 4:00pm
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Series 2 gas was raised to 46 HP and the diesel never was raised....it was still at 36 HP.
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Posted By: Tireboy
Date Posted: 01 Mar 2018 at 7:29pm
It all depends on what horsepower your looking at. Nebraska test # 635 for the gas tractor rated drawbar hp is 36.77 rated belt hp is 46.48 and maximum belt hp is 50.34. Test # 636 the diesel tractor rated drawbar hp is 35.87 rated belt hp is 45.52 and maximum belt hp is 51.14.
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Posted By: Tireboy
Date Posted: 01 Mar 2018 at 7:32pm
I made a mistake those are 17 specs i posted.
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Posted By: ACinSC
Date Posted: 01 Mar 2018 at 7:38pm
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So the drawbar HP for a gas Series 1 is 36.7 and the diesel is 35.8 ? Makes sense that the diesel would have more torque . We have both , but the gas one's still not quite up to snuff . THANKS !!
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Posted By: Tireboy
Date Posted: 01 Mar 2018 at 8:01pm
D15 Nebraska test # 795 gas tractor max drawbar is 35.33 hp rated drawbar is 28.33 hp max PTO is 40.00 hp rated PTO is 33.85 hp. Test 796 diesel tractor max drawbar is 33.32 hp rated drawbar is 26.53 hp max PTO 36.51 rated PTO is 34.36
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Posted By: AC720Man
Date Posted: 01 Mar 2018 at 8:10pm
Torque provides more power than hp. My 2007 Ram truck makes 315 hp but 650 lbs of torque. A Hemi makes 425 hp but around 325 lbs of torque. My bet is on a diesel every time. With that being said, our dad’s series II D-15 amazes us with the amount of pulling power the little power crater engine makes.
Can’t go wrong either way, unless fuel economy is a priority. The diesel wins hands down.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: AC720Man
Date Posted: 01 Mar 2018 at 8:12pm
And yes, 46 hp on the gas is correct, not sure about the diesel.
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1968 B-208, 1976 720 (2 of them)Danco brush hog, single bottom plow,52" snow thrower, belly mower,rear tine tiller, rear blade, front blade, 57"sickle bar,1983 917 hydro, 1968 7hp sno-bee, 1968 190XTD
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Posted By: ACinSC
Date Posted: 03 Mar 2018 at 6:58am
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Wonder what it would take to bump a Series 1 gas D 15 up to 46 HP ? Can a 149 cubic inch be bored out to 160 ? Just something for me to think about . THANKS !!
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Posted By: DrAllis
Date Posted: 03 Mar 2018 at 7:09am
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You can't get to 160, but I think after-market with 8 to 1 compression will get you to 155 ?? You still need a series 2 carb which is similar to a WD45 Marvel.
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Posted By: ACinSC
Date Posted: 03 Mar 2018 at 9:41am
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Thanks , Dr Allis . Something to consider down the road .
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