Tire pressure
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Forum Name: Pulling Forum
Forum Description: Forum dedicated to Tractor and Garden Pulling
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=120801
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Topic: Tire pressure
Posted By: AC puller
Subject: Tire pressure
Date Posted: 23 Mar 2016 at 10:34am
| Pulling for first time this year with 13.6 38's instead of my 28's on a wd45. On a hard track what pressure seams to work the best on a hard clay track? |
Replies:
Posted By: DrAllis
Date Posted: 23 Mar 2016 at 10:38am
| Depends on rim width and weight and cut or non-cut......8 to 10 psi is my guess. |
Posted By: AC puller
Date Posted: 23 Mar 2016 at 10:56am
| 12 inch rim. Half tread. Non cut. 4500 and 5500 class. 3 mph |
Posted By: Charlie175
Date Posted: 23 Mar 2016 at 11:11am
|
I had good luck with 10 psi last year with my 13.6x38's. They are a bit faster than 28's though ------------- Charlie '48 B, '51 CA, '56 WD45 '61 D17, '63 D12, '65 D10 , '68 One-Ninety XTD |
Posted By: DrAllis
Date Posted: 23 Mar 2016 at 11:33am
| At those weights, probably not less than 10. |
Posted By: patrickmull
Date Posted: 23 Mar 2016 at 12:54pm
| I run 10 in my full cut 15.5x38 on a hard track |
Posted By: PaulB
Date Posted: 23 Mar 2016 at 2:11pm
|
Tire pressure for pulling tires is about as loaded a questing as to what type of women one prefers or who builds the best P/U, you get as many answers as people you ask. In general if you have power and need traction go lower until the center of the tread quits biting and raises up (When you look back at your tracks after unhooking) When your lacking power raise the pressure to loose some grip. A good start for bias ply tires is 1 PSI per 1000 pounds of tractor weight, then adjust as performance dictates.
You want the tires to squat a little but not to buckle severely.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: WF owner
Date Posted: 25 Mar 2016 at 9:00am
So you're saying 3.5 psi. of in the 3500 lb. class and 4 psi in the 4000 lb. ? I have run 6 lbs. in the 3500 (on a soft track) and thought I they were way too soft. |
PaulB wrote:Posted By: DrAllis
Date Posted: 25 Mar 2016 at 10:30am
| That age old theory of 1 psi per 1,000 pounds of weight works pretty well on a 24.5 or 30.5 x 32 tire.....nothing else. |
Posted By: PaulB
Date Posted: 25 Mar 2016 at 2:13pm
|
That has worked for me in more than 40 years of pulling with everything from multi engine modifieds,
Superstocks and the small antiques I've pulled. As I mentioned depending on conditions of the day and the power your tractor has (Or lack of) and adjustment from that may be called for. Also a low ply tire on an over wide rim needs a tad more.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: DrAllis
Date Posted: 25 Mar 2016 at 5:03pm
| I have no argument with the 1 psi per 1,000 lbs with the 24.5 or 30.5 x 32 tires......I'm just sayin that ain't the way to go with a 15.5 x 38 tire on a 3500 pound antique tractor. If it works for you great....I'd never advise someone to run that low(3 1/2 psi). |
Posted By: patrickmull
Date Posted: 26 Mar 2016 at 4:35am
| at 3.5 psi you will roll the tire off on tracks in central ILL |
Posted By: PaulB
Date Posted: 26 Mar 2016 at 5:51am
|
As I first stated: asking a question about tractor pulling will get you more answers than people you ask. I started pulling in the later part of the 60s and have had a winning record in every type of pulling I've ever been involved with. I use that as a baseline to get started with a combination I have no experience with, rarely do I vary far from that. When I answer questions about what I'm doing pulling and how I win so much, nobody believes me anyway.
Lower pressures can't be used if the rim is too wide for the tire.
------------- If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY |
Posted By: WF owner
Date Posted: 26 Mar 2016 at 8:28am
| I have 16.9 x 28 (14" rims) on my WD-45. I will try anything once. I am going to try 4 psi in the 3500 and 4000 lb. classes and see how it goes. |
Posted By: TennMatt1
Date Posted: 05 Apr 2016 at 4:57am
|
AC puller I'm just curious as to how you pulled with 38's compared to 28's.I don't know how much you got in your engine to pull 5500 lb cause I've never seen one on 38's pull it. Like I said curious because I'm wanting 38's myself. ------------- 1954 WD45 |
Posted By: allispuller
Date Posted: 05 Apr 2016 at 11:53am
| Not sure about AC pullers tractor but I know my tractor pulls way better with the 38s than it ever did before and I run 4000-5500 most of the time and have hooked it in a 6500 lb class before and I had it weighed 6200-6300 lbs but the 6500 and 5500 I hook in are low gear classes but I've never powered it out in those classes with the current set up |
Posted By: AC puller
Date Posted: 06 Apr 2016 at 5:06pm
| Pulled 4 times. 4000 open,5000 open, no rpm limit. Pull my cheater rod. And 4500& 5500 3mph. Have 23degree firestones about half tread. Plain 4-1/8 overbore and headwork. Don't think I did any better than my 28's. But need to play with weights. Little different animal now. |
Posted By: AC puller
Date Posted: 06 Apr 2016 at 5:08pm
| Running 10 psi. |
Posted By: DrAllis
Date Posted: 06 Apr 2016 at 8:57pm
| 38's will almost always out distance a 28 of the same width if they are equal in wear/brand/sharpness. You're talking about "uncut" tires and that isn't very fair. Your 28's may simply have been sharper than the 38's. You can't compare a 28 Firestone F-151 to a junk Goodyear 38. |
Posted By: AC puller
Date Posted: 06 Apr 2016 at 9:04pm
| My 28's are brand new firestone field and roads. So ya your probably right. Pull against another 45 with better 38's tread wise and he beats me by 20 or so feet every time. So are newer more tread tires better than half hard tread then? |
Posted By: Brampton 02 gt
Date Posted: 07 Apr 2016 at 9:44pm
| How wide of 38'sdo you use? |
Posted By: AC puller
Date Posted: 08 Apr 2016 at 6:36am
| 14.9s |
Posted By: Robacpuller
Date Posted: 24 Apr 2016 at 8:52pm
| I run 15.5 x 38 on my 37 wc. I run 10 psi. I pull any where from 3800 to 6000 lb. Class. I have a 400 cube motor running 110 hp. Never out of power but hard to keep front down on good clay tracks. 2300rpms at around 4 mph. |
Posted By: 180Puller
Date Posted: 24 Apr 2016 at 9:04pm
Yesterday I pulled the 5500-6000-6500 5 MPH classes...I ran a little over 8 lbs in 18.4x38 Firestones on 20" rims....I might have gotten by with just a little less..
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