I question whether filling the interior of the frame members with this material
will
significantly increase stiffness - the Roadster's frame members appear to be
pretty
substantial already. A foam filling, even though the material itself, when set,
is quite
stiff, is not going to contribute materially to either the torsional, lateral or
longitudinal stiffness of the car. The loads that affect the frame members are
going to
subject a foam filling to shear stresses - stresses to which these materials
are not
sufficiently resistant for them to be beneficial. Your best bet is to treat the
frame for
external rust resistance to prevent corrosion from weakening it, rather than
attempting to
use an ineffective means of attempting to strengthen it.
Gary McCormick
San José, CA
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Marc Sayer wrote:
> Mike Kerr wrote:
> >
> > one problem though if it traps moisture it can give you probems with rusting
> > out the body
> > there was this house that they used some new type of foam as insolation
> > that caused all the nails to rust that held it together , it had formed some
> > sort of acid that did the damage .. Would be a bummer if you pumped foam
> > inot your car only to have it rust away..
> > But if this stuff is safe it could be used in the frame of the roaster to
> > stiffen it ...
>
> Mike is absolutely right. Though the stuff is used for just this purpose
> in new cars and therefore isn't going to produce rust or corrosion in
> and of itself, if the box members being filled aren't properly prepared
> first, you are going to have problems. I haven't seen the instruction
> for these products, and they may give specific dos and don'ts But I
> would think that all rust should be treated first with an agent such as
> Rustmort or Ospho, which will convert the rust to a stable iron oxide
> that is not reactive and will not corrode any further. Then a coating of
> some sort might be in order, like a paint or something. As I say the
> specific product may well have instructions as to how to use it in an
> older car, once it is released for consumer use. Of course as it is used
> now, during production of a new car, the situation is completely
> different.
>
> --
> Marc Sayer
> Editor/Publisher
> Z Car & Classic Datsun Magazine
> http://zcarmag.com
> Voice 541-726-6001
> Fax 541-746-0863/726-6001
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