Home » Public Forums » GMCnet » tire pressures
| tire pressures [message #74400] |
Fri, 19 February 2010 20:42  |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
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On the maiden voyage home with my 76 PB last November, I stopped at a truck scale and weighed each wheel. Lots of variation, from a low of 1650# (LF) to high of 2000# (RF). Now I'm looking at the recommended tire pressure table from
http://gmctech.net/tires.htm#Load
and it seems to be telling me that I should inflate my left front tire to 45psi (=40 from the table + 5 safety margin for RV's per discussion) and the right to 60psi (=55+5). Is that really what I should do???
J
Portland OR
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| Re: tire pressures [message #74403 is a reply to message #74400] |
Fri, 19 February 2010 20:50  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
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| jayrabe wrote on Fri, 19 February 2010 20:42 |
On the maiden voyage home with my 76 PB last November, I stopped at a truck scale and weighed each wheel. Lots of variation, from a low of 1650# (LF) to high of 2000# (RF). Now I'm looking at the recommended tire pressure table from
http://gmctech.net/tires.htm#Load
and it seems to be telling me that I should inflate my left front tire to 45psi (=40 from the table + 5 safety margin for RV's per discussion) and the right to 60psi (=55+5). Is that really what I should do???
J
Portland OR
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Inflate the tires in pairs taking the heaviest weight per axle. The fronts in your example should be 60.
Were there people in the coach at the time you weighed it? If so where were they sitting. If not, where will they be sitting when you drive the coach. I can see how you can easily add 200 pounds per tire up front when people are in there.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] tire pressures [message #74406 is a reply to message #74402] |
Fri, 19 February 2010 20:57 |
GMCWiperMan
Messages: 1248
Registered: December 2007
Karma: 1
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Jay,
I agree with Emery that you need to do a complete ride height adjustment
because you're "teeter-tootering" on diagonally opposite incorrectly
adjusted suspensions.
But, in the meantime, DON'T set different tire pressures on the left and
right on the SAME AXLE. That's the small print on all the tire pressure
tables: If there's a side-to-side difference in weights on an axle, use the
higher pressure on both sides.
Ken H.
On Fri, Feb 19, 2010 at 9:47 PM, Emery Stora <emerystora@mac.com> wrote:
>
> On Feb 19, 2010, at 7:42 PM, Jay Rabe wrote:
>
> >
> >
> > On the maiden voyage home with my 76 PB last November, I stopped at
> > a truck scale and weighed each wheel. Lots of variation, from a low
> > of 1650# (LF) to high of 2000# (RF). Now I'm looking at the
> > recommended tire pressure table from
> >
> > http://gmctech.net/tires.htm#Load
> >
> > and it seems to be telling me that I should inflate my left front
> > tire to 45psi (=40 from the table + 5 safety margin for RV's per
> > discussion) and the right to 60psi (=55+5). Is that really what I
> > should do???
> >
> > J
> > Portland OR
> >
>
>
> You should not be 350 # heavier in the right front (unless you have a
> 350# passenger in the right front seat :) ).
>
> This is an indication that either your front torsion bars are not set
> properly or that you have the rear level set improperly in one of the
> rear sides which is forcing weight onto the right front wheel.
>
> You should be checking the ride height of both the front and the
> rear. They do interact with each other.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
>
> _______________________________________________
> GMCnet mailing list
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| Re: [GMCnet] tire pressures [message #74414 is a reply to message #74411] |
Fri, 19 February 2010 21:41 |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
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OK, I'll see what I can do and let you know. Thanks for the feedback.
J "hopefully not as imbalanced as my ride height" Rabe
76 Palm Beach
Portland, OR
> From: gkosier@roadrunner.com
> To: gmclist@temp.gmcnet.org
> Date: Fri, 19 Feb 2010 22:33:38 -0500
> Subject: Re: [GMCnet] tire pressures
>
> I'd raise the right rear, thus jacking more weight on the left
> front.
>
> Gary Kosier
> 77EII & 77PB
> Newark, Ohio
>
> ----- Original Message -----
> From: "Jay Rabe" <jayrabe@hotmail.com>
> To: <gmclist@temp.gmcnet.org>
> Sent: Friday, February 19, 2010 9:42 PM
> Subject: [GMCnet] tire pressures
>
>
> >
> >
> > On the maiden voyage home with my 76 PB last November, I
> > stopped at a truck scale and weighed each wheel. Lots of
> > variation, from a low of 1650# (LF) to high of 2000# (RF). Now
> > I'm looking at the recommended tire pressure table from
> >
> > http://gmctech.net/tires.htm#Load
> >
> > and it seems to be telling me that I should inflate my left
> > front tire to 45psi (=40 from the table + 5 safety margin for
> > RV's per discussion) and the right to 60psi (=55+5). Is that
> > really what I should do???
> >
> > J
> > Portland OR
> >
> >
> >
> > _______________________________________________
> > GMCnet mailing list
> > List Information and Subscription Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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| Re: [GMCnet] tire pressures [message #74429 is a reply to message #74402] |
Sat, 20 February 2010 01:33 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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3 big batteries?
Ljdavick at comcast.net
On Feb 19, 2010, at 6:47 PM, Emery Stora <emerystora@mac.com> wrote:
>
> On Feb 19, 2010, at 7:42 PM, Jay Rabe wrote:
>
>>
>>
>> On the maiden voyage home with my 76 PB last November, I stopped at
>> a truck scale and weighed each wheel. Lots of variation, from a low
>> of 1650# (LF) to high of 2000# (RF). Now I'm looking at the
>> recommended tire pressure table from
>>
>> http://gmctech.net/tires.htm#Load
>>
>> and it seems to be telling me that I should inflate my left front
>> tire to 45psi (=40 from the table + 5 safety margin for RV's per
>> discussion) and the right to 60psi (=55+5). Is that really what I
>> should do???
>>
>> J
>> Portland OR
>>
>
>
> You should not be 350 # heavier in the right front (unless you have a
> 350# passenger in the right front seat :) ).
>
> This is an indication that either your front torsion bars are not set
> properly or that you have the rear level set improperly in one of the
> rear sides which is forcing weight onto the right front wheel.
>
> You should be checking the ride height of both the front and the
> rear. They do interact with each other.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
>
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] tire pressures [message #74446 is a reply to message #74444] |
Sat, 20 February 2010 09:07 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Bruce,
I'm thinking that it would be best to weigh the coach as it is going
to be operated. Tanks at normal capacity, passengers and gear etc.
The ride height must be properly adjusted though if this is going to
work. Emery is correct. Check out Gene's site for some useful info
on how to properly set ride height. A real PITA but once it's done,
it's done for a long time.
On Sat, Feb 20, 2010 at 7:59 AM, Bruce Hislop <bruce@perthcomm.com> wrote:
>
>
> I've been wondering how to properly balance the coach. Since both the front and back suspensions are adjustable I can see where a "cranked" torsion bar on one side can be balanced by a diagonally opposite increased airbag pressure.
>
> I'm thinking that after the coach is loaded as usual, the weight at each corner of the coach be taken with the wheels off the ground. In otherwords an unloaded suspension in order to get the true weight at each wheel. Then the suspension needs to be adjusted to put the same weight on each wheel, combined with the proper ride height.
>
> What say ye?
>
>
> --
> Bruce Hislop,
> S. Ontario Canada
> 77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI and ESC.
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] tire pressures [message #74517 is a reply to message #74514] |
Sun, 21 February 2010 06:52 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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That is exactly what I was looking for Gene, darned if I could find it.
On Sat, Feb 20, 2010 at 9:09 PM, Mr.erf ERFisher <mr.erfisher@gmail.com> wrote:
> here is the link and you can also click on the title
>
> http://www.gmcmotorhome.info/rear.html#height
>
> gene
>
>
>
> On Sat, Feb 20, 2010 at 9:14 AM, Jon Payne <embrep@sbcglobal.net> wrote:
>
>>
>>
>> Steve do you have link to Gene's site? I think I have come across it before
>> but can't seem to find it.
>>
>> Jon
>> --
>> Jon Payne/
>> 76 Palm Beach/
>> Westfield,IN
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>
>
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: tire pressures [message #74567 is a reply to message #74400] |
Sun, 21 February 2010 14:28 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| jayrabe wrote on Fri, 19 February 2010 18:42 |
On the maiden voyage home with my 76 PB last November, I stopped at a truck scale and weighed each wheel. Lots of variation, from a low of 1650# (LF) to high of 2000# (RF).
<< snipped >>
Is that really what I should do???
|
Jay,
Was this before we found the shut off valves on your bags shut off? You may want to remeasure with them open and the air system in travel.
Until then put the same pressure on both sides of the same axle. 60 to 65 in the fronts and 55 to 60 in the rears.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] tire pressures [message #74573 is a reply to message #74567] |
Sun, 21 February 2010 15:42 |
jayrabe
Messages: 509
Registered: June 2009
Location: Portland, OR
Karma: 0
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Senior Member |
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I appear to have problems with the leveling system. The valves may be frozen or plugged closed, because I get no up/down movement when manually actuating the pump. The pump comes on, but nothing moves at the wheel. Not exactly sure how to troubleshoot the problem. Thought about pulling air lines off and seeing which ones blow air. Any risks or tips?
J
76 Palm Beach
Portland, OR
> To: gmclist@temp.gmcnet.org
> From: m000035@gmail.com
> Date: Sun, 21 Feb 2010 14:28:09 -0600
> Subject: Re: [GMCnet] tire pressures
>
>
>
> jayrabe wrote on Fri, 19 February 2010 18:42
> > On the maiden voyage home with my 76 PB last November, I stopped at a truck scale and weighed each wheel. Lots of variation, from a low of 1650# (LF) to high of 2000# (RF).
> >
> > << snipped >>
> >
> > Is that really what I should do???
>
>
> Jay,
>
> Was this before we found the shut off valves on your bags shut off? You may want to remeasure with them open and the air system in travel.
>
> Until then put the same pressure on both sides of the same axle. 60 to 65 in the fronts and 55 to 60 in the rears.
> --
> Mike Miller
> `73 26' X Painted D.
> `78 23' Birchaven
> Hillsboro, OR
> _______________________________________________
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