Old Guy Question: Vintage 4 ply tire pressure - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-08-2006, 09:12 AM
lakeroadster's Avatar
Hot Rods are Built, not Bought
 

Last journal entry: Lakeroadster's '31 Model A Tudor
Last photo:
Join Date: Dec 2001
Location: High Plains - Rocky Mountains
Age: 53
Posts: 530
Wiki Edits: 0

Thanks: 13
Thanked 63 Times in 58 Posts
Old Guy Question: Vintage 4 ply tire pressure

Here is a question for you older Rodders:

I am running BFG Silvertown 4-ply's on my steel '27 Ford Roadster Pickup. 820-15 w/ 15x8 rims on back, 500-15 w/ 15x4 rims on the front. The RPU weighs in at 2250 lbs. (SBF, 4-speed, 9 inch rear, yadda, yadda,yadda)

I am running about 30 psi in all four tires. Any problems dropping the air pressure? Will this make "flat spotting" worse?

Hopefully I can get some "actual, yeah I know 'cause I have tried it" replies to this question, as opposed to the standard "put radials on it" no brainer responses.

Thanks in advance Ya'll.
Attached Thumbnails
Click image for larger version

Name:	27 RPU WEB.jpg
Views:	37
Size:	113.7 KB
ID:	13236  

Last edited by lakeroadster; 07-08-2006 at 11:11 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-08-2006, 09:52 AM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,182
Wiki Edits: 4

Thanks: 0
Thanked 5 Times in 5 Posts
Got Coker wide whites on the coupe in my avatar......big ones on the back..little ones on the front....they are bias ply.....I do them like I do all my other tires 35 lbs.....no mattter what size.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-08-2006, 10:09 AM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 69
Posts: 7,025
Wiki Edits: 3

Thanks: 24
Thanked 98 Times in 94 Posts
I would get myself a very good accurate tire pressure gauge and try dropping to say 27 or 28 lbs on those tires..a pound or two makes a real difference with bias ply..if you go down to 20 or so you may run into issues with heat and handling as well as flat spots..Now what that is is a trick from the racing days when we woudl adjust tire pressures to get the best handling..30 lbs on those tires and that car sounds like a good place to be tho to me..

Good luck..

Sam
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-08-2006, 01:06 PM
Deuce's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Choosing a trailer
Last journal entry: Jan 13 2013
Last photo:
Join Date: Aug 2002
Location: Deuceland USA
Age: 65
Posts: 5,657
Wiki Edits: 6

Thanks: 0
Thanked 9 Times in 9 Posts
As a older guy ... Been there tried that ... bias ply deal ...

Start at 30 lbs and just experiment ...
My 32 would NEVER get the ride I wanted with the bias ply tires. I started with radials ( and was spoiled by the good ride ) and then tried the bias ply ... for looks . Bad idea on my part ... Went back to the radials ...

Deuce Moderator ...
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-08-2006, 01:24 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by lakeroadster
Here is a question for you older Rodders:

......Any problems dropping the air pressure? Will this make "flat spotting" worse?

Hopefully I can get some "actual, yeah I know 'cause I have tried it" replies to this question, as opposed to the standard "put radials on it" no brainer responses.

Thanks in advance Ya'll.

OK, I grew up with this stuff and watched the transition from nylon cord to polyester cord and then to belted and on to radial tires.

Tires flat spotting when parked is a characteristic of bias ply tires, worse for nylon cord than for polyester cord. Changing pressure makes little to no difference, except to say, less pressure is worse. They will bump until warmed up.

High speed driving and then parking, especially on a very cold day, adds to the severity of the bump.

I have seen some "made in the 2000s" radials do it when parked for weeks.

Last edited by xntrik; 07-08-2006 at 01:30 PM.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-08-2006, 01:42 PM
Henry Highrise's Avatar
Lost in the 60's
 
Last wiki edit: Removing stuck fasteners Last photo:
Join Date: Dec 2001
Location: Dixieland
Age: 69
Posts: 15,182
Wiki Edits: 4

Thanks: 0
Thanked 5 Times in 5 Posts
xntrik is exactly right......the reason I run 35 psi in all my tires radial or bias is because if I don't they wear on the outside edges. I have found with 35 they wear even. Another thing letting radials sit up for sevearal days or a week at a time will cause flat spots and instead of coming back into shape like a bias tire does they will eventually slip the belts if you do it enough. I just replaced all four tires on my Z-71 on account of that....I only drove it on weekends for the past three years. The folks at the tire shop said that will make them slip the belts or separate the belts. It made it drive bad and had a funny wear pattern.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-08-2006, 01:58 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Henry Highrise
xntrik is exactly right......the reason I run 35 psi in all my tires radial or bias is because if I don't they wear on the outside edges. I have found with 35 they wear even. Another thing letting radials sit up for sevearal days or a week at a time will cause flat spots and instead of coming back into shape like a bias tire does they will eventually slip the belts if you do it enough. I just replaced all four tires on my Z-71 on account of that....I only drove it on weekends for the past three years. The folks at the tire shop said that will make them slip the belts or separate the belts. It made it drive bad and had a funny wear pattern.

Yep, had TAs and Eagles do it. But it is a pain to jack it up when parking.

Never saw any Michelin do it or the old TAs that are now being repopped with the wide whites.

www.readershotrods.com

Last edited by xntrik; 07-08-2006 at 02:38 PM.
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tire Tricky question Ratoflic Hotrodding Basics 3 01-14-2005 03:06 PM
Tire Pressure 68firebirdguy General Rodding Tech 14 07-21-2004 09:16 PM
Recommened Tire Pressure? Malibucdl General Rodding Tech 10 01-12-2004 11:06 AM
Tire question adb2f Transmission - Rearend 10 01-01-2004 09:28 PM
Proper Tire Pressure ?? bigjoedo Suspension - Brakes - Steering 2 06-24-2002 03:08 PM


All times are GMT -6. The time now is 03:32 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.