[200q20v] Re: Strut tower maximum lateral force
C1J1Miller at aol.com
C1J1Miller at aol.com
Sun Mar 11 11:59:16 EST 2001
In a message dated 3/9/01 2:29:16 PM Eastern Standard Time,
b.m.benz at prodigy.net writes:
> Dave, I stand corrected! Thanks. Why didn't you guys catch the error when
> I first posted this back in July? So, X my figures by a factor of 3 or 4.
>
> Compression on the EMT is insugnificant, but the EMT must be straight to
> prevent buckling failure.
>
> Bernie
Here's what I'd posted back then...
Chris
-------------------
Subj: Re: Strut tower maximum latteral force.
Date: 7/7/00
To: b.m.benz at prodigy.net, gregsj at iea.com
CC: 200q20v at 200q20v.com, audi20v at rennlist.org
In a message dated 7/7/00 1:44:39 AM Eastern Daylight Time,
b.m.benz at prodigy.net writes:
> The suspension geometery divides this force between the lower link and the
> upper strut anchor point by the ratio of these two distances from the axle.
> On the type 44 chassis, Axle C/L to ball joint C/L = 4", axle C/L to strut
> piston rod anchor w/ a compressed suspension = 20". Therefore 4/20 x 740 =
> 150lbs force. This is the theoretical, far out, maximum latteral force
> that the strut tower will ever see! (My strut brace further equalizes this
> force between the two strut towers to 75 lbs max.)
>
> Bernie
Bernie, I can see several cases where this value would be exceeded; including
hitting a pothole (could get a lot more than .3 cf), especially in braking,
with weight transfer, etc.
Doesn't really matter what the forces are; there is damage to a reinforcement
for the tower, and later cars (S4/6) were sent from the factory with a simple
bar strut brace. My thoughts were just to use the factory parts, then add
some form of adjustment.
The worst damage we've seen is a crack in this webbing; doubt it would
progress much further. People should note that Bernie's car, with higher
mileage, and his custom strut brace, does not have damage in this area;
perhaps Bernie's brace is all that is needed.
chris
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