Re: [AMC-List] rubber, urethane, noise -- was Prothane = Strut bushings

[Mark Price <markprice242@xxxxxxxxxxxx>]

Sounds like my American matches the Hornet ride.
It has used V8 springs, Poly bushings everywhere except the struts, those are still rubber. The 205/60/15's at 32 PSI don't help any! The alck of carpetings also increases road noise. Shocks are low pressure gas.
  The next phase of work entails the new 2.95 first gear T5 Z pec trans and floor insulation and carpet. The floor will be getting coated with the Peel and stick stuff then standar carpt and pad.I expect those additions to make a big change in NVH!
  I know my full size Bronco really quieted down when I carpeted the rear area over the rubber mat.
--
Mark Price
markprice242ATadelphia.net
Morgantown, WV


---- Tom Jennings <tomj@xxxxxxx> wrote: 
> On Thu, 2 Nov 2006, Swygert, Francis G MSgt 436 CES/CECM wrote:
> 
> > John, on the 63-66 big cars I notice it when I hit a pot hole! You'd
> > feel something like that even with new stock bushings, but there's a
> > very pronounced jar with the urethane strut rod bushing. Feels like
> 
> We're of course talking about really subjective, hard to measure
> things, but while I think the half urethane/half rubber bushings
> I run in the 63 Classic are a *bit* harsher, it's not serious,
> and I definitely don't feel it in the floorboards (sic).
> 
> The worst feature of the urethane is the infamous groaning, but
> after a year or two they mostly shut up except at high curbs etc.
> 
> In fact, the 63 Classic rides unbelieveably smoothly, for an
> inexpensive car. There's no front sway bar so it... sways,
> but this ain't no sports car, I don't mind, it suits the car
> just fine.
> 
> Don't you, Frank, have rack steering? Could be impulse energy
> transmission that way, to the chassis.
> 
> 
> 
> 
> Now my 70 Hornet, that's a rough cheap ride. It's 100% new as
> stock (OK, 20K mi), stock springs +1" height, KYB shocks, stock
> "heavy duty" sized tires (195/70-14) at 30psi, all rubber parts
> except the famous John Elle spring tower fix w/urethane's.
> 
> I don't think there's anything wrong with the car, but it
> doesn't have any of the side-sill insulators or the later
> iso-mount rear insulators.
> 
> I think it's lighter than the 63 Classic by 200 - 300 lbs. (I
> weighed the 63 Classic wagon on an actual scale: 3150 lbs. TSMs
> etc talk about ICC-agreed-upon ship weight). Don't know what
> the Hornet weighs, but I guess about 3000.
> 
> Not sure exactly why the Hornet rides so rough. It handles fine
> (as it could ever), has stock sway bar. You just feel and hear
> rough roads.
> 
> The 72, less-good suspension (new springs all around, but I
> repair ball joints etc as they wear rather), rides the same;
> good handling, no noises, solid, noisy and rough.
> 
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