cross member

[Walko]

A while ago a board member posted with some pictures of an early RSR cross member

what is the visual difference between that alloy cross member and one from a normal 911SC??

[Tyson Schmidt]

Looks like there are two bolts holding the strap to the crossmember instead of one.

I bet there is also a difference in height for the perches where the steering rack bolts on. The Turbo's were different here, because the rear of the control arm mounting points are raised in the chassis to build in some anti-dive suspension geometry. I wonder if they did this on the RSR first.

[bigchillcar]

Figured this thread was going to be about a pissed-off pelicanite...
Ryan

[Walko]

Sorry Ryan just looking for information.

I am doing a restoration on a long hood and I keep coming up with funny parts which dont make sense to be on the car.

Micahel

[aturboman]

For the record RSR & early 73RS aluminum front crossmembers are a forging not a casting. All the production crossmembers are cast aluminum. You can see the nice smooth finish of the metal in the photo.

[Walko]

So are the shiny ones the forged and the dull ones cast??

Michael

[aturboman]

It isn't that simple. I've seen "regular" aluminum ones polished.
The are dimensional differences as described above, and if you looked at the two up close you'd seen a graining diffrerence in the metal itself. I think one other way might be the date stamped into the part. Most RSR & RS's were 73-75. The aluminum production crossmember didn't come into play until somtime around 1978. There is usually a little mark on these with the date of manufature on it.

[Walko]

Well I has a good look at the one that came off my long hood and it is reasonably shing and does not have any date marks. it doesnt look like it been polished.

Michael

[aturboman]

Maybe you have an RSR and don't know it??

[Walko]

With this car nothing would suprise me.

When I started to strip it down I was expecting to find some rust. I was pleasantly suprised when no rust was found.

It was when we started looking at the mechanical parts that things got interesting. Like the front cross member the rear trailing arms have been boxed, the fornt apron has holes in it and it is recessed back like it had a 2.7RS oil cooler up there.

THe car is a matching numbers car with full serive history from day one so i would assume it has not been raced but something doesn't add up.

But it will make a great 911ST clone.


Michael

[aturboman]

Sounds like you have an interesting project. Post some pictures of your progress with us when you can.

[jluetjen]

What's the number on the car? Who knows, maybe you have an ST?

[Walko]

John,

don't have the number with me at work will post on monday.

Michael