New puller questions
Printed From: Unofficial Allis
Category: Other Topics
Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=155657
Printed Date: 04 Dec 2024 at 1:34pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: New puller questions
Posted By: Backwoods
Subject: New puller questions
Date Posted: 16 Nov 2018 at 6:52pm
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Hello everyone. I am looking at building a new pulling tractor. I know that I want to pull in the 3500, 4500, and 5500 lb classes. I know I want to put 15.5-38 tires on it. I was wondering what would be a better base tractor, a wd or wd45? Is there any gear ratios that I want? What engine block would you start with that looks stock to the tractor? What would you do to that engine?
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Replies:
Posted By: DrAllis
Date Posted: 16 Nov 2018 at 10:16pm
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Depends on the rules you will be pulling under. Some Clubs insist on LOW gear only. Some have an actual speed limit of 3.5 or maybe 4.0 MPH with a horn on the sled. The difference between 3.5 and 4.0 MPH is do you have enough engine ?? The top RPM that is allowed has a bearing on things too. Some clubs allow only max stock RPM of 1700. Some others allow 10% or 20% over 1700 RPM. You'll probably not run 5,500 lbs with 15.5 x 38 tires and be very successful unless the competition is pretty weak. A WD or WD45 belong in 4500 lbs or less to usually be at their best where I come from. The type of dirt you pull on makes a difference too. Low gear is 13% faster in a WD than a WD45 and will meet the 3.5 MPH speed. Second gear is 5% faster in a WD over a WD45 and is almost 5 MPH. These numbers are with an average 15.5 x 38 tire diameter and 1700 RPM. When I built my WD some 25 years ago, it could run LOW gear from 3500 to 5,000 lbs almost anywhere and on some tracks 5,500. This was with 15.5 x 38 cut rubber, a short /20 inch high drawbar and about 80 to 85 HP with 15% over stock RPM. That is a bit more than a 35 HP WD had when new. I see WD45's run un-sharpened/not-cut 38 inch rubber in low gear with a 16 inch high/ long drawbar(another rule) and most of the time have enough power (LOW gear @ 4500 lbs) in my kind of dirt. So, a healthy WD45 engine is an absolute bare minimum. If you are wanting an engine that is capable of running second gear with 38 inch cut tires, a 20 inch high drawbar and weighing 4500 lbs, you are talking 100 HP and lots of $$$$$ to get there.
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Posted By: Backwoods
Date Posted: 17 Nov 2018 at 8:02am
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Basically the club rules say that you tractor needs to have a fucncutioning govener. It says nothing about turbos in the rule and we can put any fuel in it that we want. There are no speed limits. This club is not transfer sled but pulls dead weight 100 ft. Actually in our club there is a Allis wc with 15.5-38 that pulls in 3500 all the way up to 6500.
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Posted By: DrAllis
Date Posted: 17 Nov 2018 at 1:56pm
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I don't consider jerking a block as "pulling". Good luck with your wide open/anything goes rules. Sounds like you've got it figured out with a WC in the 6500 lb class. Better have a spare chassis laying around for driveline repair parts.
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