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Ft pounds torque on AC C 125 CI gas??
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Allis Forever View Drop Down
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Joined: 18 Jun 2020
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    Posted: 03 Jun 2021 at 6:22pm
AC Gas 125 CI engine ft pounds torque?

Anyone know the torque on a b c ca 125 CI gas engine. The 226 wd45 has 288 ft pounds according to Nebraska test

I assume around 120-140 ft pounds but any documentation or dyno results in stock or close to stock form would be great
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DiyDave View Drop Down
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Points: 53330 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DiyDave Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2021 at 8:40pm
 the equation to find HP is Ft Lbs torque X RPM / 5252. Since we know the HP & the RPM's, finding torque isn't hard.
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steve(ill) View Drop Down
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Points: 85729 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2021 at 8:55pm
The problem is that MAX HP occurs about 1500- 1650 RPM... But MAX TORQUE occures about 900 - 1000 RPM.. 

For a CA motor ( or any), you cant fill in 24 HP = 125 ft # X 1650 RPM / 5252 .... you have to use the MAX TORQUE point which is probably 900 RPM.

24 = TQ  Ft #  x 900 RPM / 5252  ...........  or approx 140 ft # ..... if the 24 HP and 900 RPM are correct !


if you used 1050 RPM., you get............ TQ = 24 x  5252 /  1050  =    120 ft # .


------------- and even those numbers are not right be cause the DYNO measures TORQUE, then you calculate the HP with the equation... and we dont know the HP at 1000 RPM .... just at 1650 rpm..... HP at the 1000 RPM point might be 18 - 20 HP ???


Edited by steve(ill) - 03 Jun 2021 at 9:16pm
Like them all, but love the "B"s.
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Points: 85729 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2021 at 9:08pm
this is a curve for some smaller car motor so the  RPM and TORQUE numbers are not correct, but it does show what you will end up with on MOST motors... AS you LUG DOWN, you will get MAX TORQUE on the CE motor RED , somewhere around 900 - 1000 RPM i would guess... while the MAX HP-  BLUE will not come in until about 1650 -  1750 RPM  range.
Like them all, but love the "B"s.
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Model B-125 engine on gasoline makes 25.8 flywheel HP @ 1600 RPM, which I think would match the CA tractor. Peak torque is 87 ft lbs @ 1150 RPM.  The W-226 engine from a WD45 peak torque is 196 ft lbs @ 1,000 RPM. Tractor Data isn't giving flywheel/engine torque but PTO torque I think, or they are just simply wrong (again).
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Points: 1060 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Les Kerf Quote  Post ReplyReply Direct Link To This Post Posted: 03 Jun 2021 at 10:02pm
I believe that the Nebraska Tractor tests used belt horsepower during that era according to my book by CH Wendell. Not sure how much loss was incurred through the drive train, but there certainly was some.
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Points: 10508 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian Jasper co. Ia Quote  Post ReplyReply Direct Link To This Post Posted: 09 Jun 2021 at 1:33pm
I just looked at my copy of the Nebraska Tractor Test book and it doesn't have the torque published. You might be able to find it by going online to the University of Nebraska Tractor Test site. Last I knew you could look up and print off entire test reports.
"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford
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