crossmember update (more pics..)

[treed2@u.washington.edu (T. Reed)]

Shite. Looks like I made a pretty big incorrect assumption.

Well, I will have to reevaluate this whole project next weekend. I still
think the bar offers some benefit, but maybe I need to tie it in somewhere
else. Who knows..

-Toby

On Mon, 3 Mar 2003, Scott F. Williams wrote:

> Toby:
>
> a) Start your car.
> b) Pop your hood.
> c) Yank the throttle cable.
> d) Note the direction of engine rotation.
>
> -CLOCKWISE! That is, under torque, the movement against the front motor
> mount is *upwards*. :^)
> --
> Scott F. Williams
> NJ Scirocco nut
> '99 Subaru Impreza 2.5 RS
> Mazda 323 GTX turbo "assaulted" vehicle
> Golf GTI 16v "rollycar"
> ClubVAC: "Roads found. Drivers wanted."
>
> -----Original Message-----
> From: scirocco-l-admin@scirocco.org
> [mailto:scirocco-l-admin@scirocco.org]On Behalf Of T. Reed
> Sent: Monday, March 03, 2003 11:31 PM
> To: Allyn
> Cc: scirocco-l@scirocco.org
> Subject: Re: crossmember update (more pics..)
>
>
> Al,
>
> I'm afraid I don't understand. When you step on the gas the engine twists
> axially around the side motor mounts, in the same direction as the wheels.
> If you sit on the drivers side of the car looking at the driver side wheel
> it is turning counterclockwise when the car is going forward. When you
> accelerate, it turns counterclockwise harder and pushes down on the front
> motor mount. The front motor mount is tied in to the crossmember bar, so
> the force vector points straight down.
>
> Perhaps you're thinking that the placement of the inner cv joint relative
> to the axis of rotation at the side motor mounts would make the engine
> twist the opposite direction as the wheels. If this were the case, why is
> my crossmember cracked on the bottom rather than the top? Tension causes
> cracking, not compression (or at least it takes a great deal more
> compression to crack sheet metal in general)
>
> Could you clarify your statement?
>
> Thanks,
>
> -Toby
>
> On Mon, 3 Mar 2003, Allyn wrote:
>
> > > First of all, the force vector acting on the crossmember points straight
> > > down.
> >
> > umm, during a downshift perhaps, but the major load is in the upward
> > direction, during acceleration. i think this makes your whole explination
> > backwards (as far as tensile/compressive stresses), but it will work just
> > the same.
> > Al
> >
> >
>
>
>
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