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Re: [GMCnet] Why not fix one ton scrub radius with wheel offset? [message #361942 is a reply to message #361936] Fri, 22 January 2021 21:36 Go to previous messageGo to previous message
Zandr Milewski is currently offline  Zandr Milewski   United States
Messages: 12
Registered: September 2020
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Junior Member
Jim-

At first approximation, no argument. These are six-ton beasts, and you
have to scale your expectations accordingly.

On the other hand, if we can understand the suspension geometry at play,
we can make the best of our lot. Certainly, the concerns about scrub
radius have a basis in minimizing torque steer. The "non-parallel
control arms" question is more interesting, as that relates to camber
gain, and depending on other factors, bump steer.

Zero camber gain is not always the answer. The only doc I've seen with a
discussion of suspension geometry didn't really understand how it
worked, as it concluded incorrectly that every one-ton coach should be
sitting on the bump stops.

-Zandr

On 1/22/21 17:18, James Hupy via Gmclist wrote:
> The GMC Motorhome is NOT a performance vehicle. It wallows in tight curves,
> barely stays straight on good roads. It is at least 40 years old, and
> designed around parts plucked from production lines of various automobiles
> of the era. Nothing state of the art about the suspension and drive train.
> It does a fair job of point to point transportation of a heavy vehicle
> that has a great deal of its weight centered above the tops of the tires.
> A race car, it definitely is NOT! If you do not expect sports car
> handling, and maintain the drive train/suspension parts well, it is safe
> enough to drive in traffic if you don't follow too closely and drive "eyes
> way down the road ahead", you won't get in too much trouble.
> There are upgrades that improve braking quite a bit, and that is one
> huge reason for the 1-ton conversion. That and much stronger lower control
> arms and front wheel bearings as well as upper and lower ball joints.
> Handling? Very subjective at best. It still is a top heavy front wheel
> drive vehicle. Not much will ever change those facts.
> Do I love them? Yep! But, don't put lipstick on them. Underneath, they
> are still a very good looking pig.(grin)
> Jim Hupy
> Salem, Oregon
>
> On Fri, Jan 22, 2021, 4:55 PM Joe Weir via Gmclist
> wrote:
>
>> Yes, My bad. The point was that while not completely fixing the issue,
>> it certainly moves it closer to correct.
>>
>> Zandr Milewski wrote on Fri, 22 January 2021 16:15
>>> On 1/22/21 06:55, John R. Lebetski via Gmclist wrote:
>>>> Also moving tire inboard may be able to fix the steering axis or some
>> of the error, but not sure that totally fixes scrub radius.
>>> Scrub radius is literally defined as the distance between the center of
>>> the contact patch and the point where the steering axis touches the
>> ground.
>>>
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>> --
>> 76 Birchaven - "Wicked Mistress" - New engine, trans, alum radiator,
>> brakes, Sully airbags, fuel lines, seats, adult beverage center... those
>> Coachmen
>> guys were really thinking about us second hand owners by including that
>> beverage center...
>> Columbia, SC.
>>
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