Farm Equipment - WD 45 diesel

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WD 45 diesel

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Category: Allis Chalmers
Forum Name: Farm Equipment
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=41954
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Topic: WD 45 diesel

Posted By: gordon s
Subject: WD 45 diesel
Date Posted: 11 Dec 2011 at 1:15pm

I have had trouble establishing the horse power out put for this tractor ?

I understand the "45" is a horse power designation but surely a 6 cylinder deisel prodced more horse power than a 4 cylinder gas engine ?

Replies:

Posted By: RichinWis
Date Posted: 11 Dec 2011 at 1:26pm

maybe more torque but not always more HP. also one must consider displacement.

Posted By: John (C-IL)
Date Posted: 11 Dec 2011 at 1:34pm

Most likely the 45 designation stood for 4.5 inch stroke of the 226 CI engine. The gas engine was rated at 37.84 horsepower at the drawbar and 43.21 horsepower at the belt with 5441 pounds of maximum pull. The diesel was rated at 39.50 drawbar, 43.29 belt and 5908 drawbar pull. Torque wins again. Numbers taken from Terry Dean's book and are most likely Nebraska Tractor Test ratings.

Posted By: Tom Miller (IA)
Date Posted: 11 Dec 2011 at 1:54pm

If you have the chance to operate one of each you will notice the differences between the two engines! I have both and I will go to the diesel probably 75% of the time if I have my choice.

Posted By: m16ty
Date Posted: 11 Dec 2011 at 8:28pm

I was always under the impression that "45" was the advertized pto hp rating. Of course when they went to the Nebraska test they fell short by a couple of hp.

Posted By: 1946WP
Date Posted: 11 Dec 2011 at 8:54pm

i have a gas & a diesel both & i guess I can't seem to see any more power in the diesel. I guess i'm just used to the quickness of the governor on the gas. the diesel seems to be more like IH power , slower on the governor.

Posted By: TramwayGuy
Date Posted: 11 Dec 2011 at 9:24pm

Even though the Diesel has 6 cylinders compared to the Gas' 4 cylinders, the displacement of the diesel was only 4 cubic inches more than the gas. In fact, the diesel had to run a couple hundred RPM faster to obtain roughly the same power output as the 4-cylinder gas engine. That was accomplished by changing the ratio of the rear end gear and the pto gearing.

Posted By: DougS
Date Posted: 11 Dec 2011 at 9:34pm

What Tramway said. And about torque... extra torque is nice to have when the going gets tough and you don't have to do a downshift to get through that rough spot in the field. You are essentially creating more torque at the drive wheels when you downshift. Horsepower on the other hand is a measure of how much work the engine is doing. It can generally be said that the engine that can do more work will do more work, if operated properly. Having said this, the two HP drawbar difference between the gas and the diesel will hardly be noticeable.

Posted By: Tom Miller (IA)
Date Posted: 11 Dec 2011 at 9:57pm

Doug, so are you saying that there is no difference between the 45 gas and diesel and they perform equally?

Posted By: JC-WI
Date Posted: 11 Dec 2011 at 10:50pm

The one thing I noticed a long time ago was that the Buda engine was origionally an engine for the industry application. If I remember right, the engine was running at 2700rpm with a load rating of 2400 and developed 72 hp fbhp. But when it was put into the WD45, it was derated to 1625 rpm and app. 51 bhp. This engine was durable in the industrail application but being derated, at 1625, it was always sort of underload all the time and when the gov.hit full load, it didn't have several hundred rpm to fall back on.

Posted By: WD45
Date Posted: 12 Dec 2011 at 8:12am

We have one of each plus a propane model. We found the diesel model has more torque pulling a tandem axle spreader loaded versus the gas model.

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Fred Dunlop, G,B,CA, WC,WF, 3 WD45`s,gas, diesel and LP,U,D10 series III, D12,D14,D15 SERIES II,D17 Series IV in Gas and Diesel ,D19 GAS and D21,170 185,210 ,220 an I-600 8070 fwd, 716H and 1920H

Posted By: gordon s
Date Posted: 12 Dec 2011 at 10:05am

Thank you all for your help.

I have had no experience with a WD 45 but sure did a lot of rounds on a WD.

I am surprised the diesel doesn't generate more torque than the gas version.

There seems to be explanations in the various responses.

A little disappointing. The diesel looks massive/cool.