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2wise4agm 
Orange Level
Joined: 19 Aug 2011
Location: Smithton, MO
Points: 538
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 Topic: Wd45 or D17
Posted: 02 Oct 2014 at 7:37pm |
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Thinking of building a smaller tractor to play with. Would like to pull in 4000 and 4500 classes. (Basically natpa division III.) 3.5 or 5 mph max speed limit pulls. Non cut tires. Is there any advantage to the d17 or should I just go with a wd45? Mainly just interested in the speed differences. Would the power director be of any advantage at these speeds? Thanks guys.
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Charlie175
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Joined: 11 Sep 2009
Location: Shenandoah, VA
Points: 6358
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Posted: 02 Oct 2014 at 8:04pm |
WD45 easier to balance and add weight brackets too
D17 does have gearing advantage.
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Charlie
'48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD
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2wise4agm
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Joined: 19 Aug 2011
Location: Smithton, MO
Points: 538
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Posted: 02 Oct 2014 at 8:21pm |
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I'm just thinking that wd would just have one useable gear. D17 might have two. Someone please correct me if I'm wrong.
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Juiceman
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Joined: 26 Aug 2013
Location: West Virginia
Points: 110
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Posted: 02 Oct 2014 at 8:47pm |
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(Rpm* tire diameter)/ (gear reduction*336)=mph. I don't know what natpa division 3 speed limit is, but figure out the rpm you will be running and your tires diameter to compare the different gearings. For example our wd45 has first gear reduction of 98.32. So at 1800rpms with our 15.5 38's it looks like this. (1800*60)/(98.32*336)=3.26mph, with no slippage of course. So figure out your engine rpm, and tires you want to run and pick the tractor by gearing. I have all the reduction numbers if u wamt them courtesy of the Antique Tractor Pull Guide. Wd would be easier to balance though.
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XT in pa
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Joined: 21 Apr 2011
Location: hickory pa
Points: 711
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Posted: 02 Oct 2014 at 9:09pm |
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A 17 would have no weight on it in 4000 and 100lb on front in 4500 I think it's 3.5 mph and aloud cuts in div. 3. 17 can run more rpms. But natpa won't allow a 17 below 4500lb class. Just my 2 cents. Shawn.
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190XT,D17and 7045
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kendall
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Joined: 01 Nov 2014
Location: United States
Points: 13
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Posted: 01 Nov 2014 at 9:32pm |
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I have a WD with WD45 crank in it that I pull 3,500-4,500 and a D17that I have down to 3,800lbs.WD will outpull D17 all day long just cuz it balances so much better. Only advantage to D17 is if you go heavy weight classes since it has all gears to choose from. I run 13.6-38" tires on both. Low 3rd on D17 is about same as 1st on WD.
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2wise4agm
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Joined: 19 Aug 2011
Location: Smithton, MO
Points: 538
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Posted: 02 Nov 2014 at 9:09am |
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I came home with a narrow front wd45 last weekend. I'll probably have many upcoming forum questions. Thanks guys.
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