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Final word on steering rack cover - Need - Don't Need??
84 Carrera - have done some searching with regard to the rack cover being structural or not. Was wanting to ditch if not or if other mods are needed.
I think Thom was making a fiberglass part and some mentioned that is was structural and it saw some loading and others said it did not. Yes I have it bad. Thoughts? -Jeff
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Jeff |
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11-28-2005, 06:40 AM
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Jeff, I run without it. I have an AL crossmember in my 73E and it has the support struts to tie to the body. I don't know about the loading, but I'm inclined to think it's to keep debris away from the brake master cylinder and the steering rack.
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Jim R. |
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11-28-2005, 06:44 AM
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I thought about this too. Mine seems to have done more bad than good in that it has the nack for holding mud and water and has caused the sway bar to rust where crosses inside of the rack cover. Might concider drilling some holes in it when, if ever, I get the car back on the road. Plus the thing is heavy.
Rich
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"The reason most people give up is because they look at how far they have to go, not how far they have come." -Bruce Anderson via FB -Marine Blue '87 930 |
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11-28-2005, 06:45 AM
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Yeah it is really heavy - is the 73 setup much different than the Carrera structure?
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Jeff |
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11-28-2005, 06:48 AM
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The early one is lighter from what I've heard. But, I don't think it'll fit on cars equipped with the AL crossmember.
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Jim R. |
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11-28-2005, 07:01 AM
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I was advised by Auto Associates that I did not need it.
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Tom Butler 1973 RSR Clone 1970 911E 914-6 GT Recreation in Process |
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11-28-2005, 09:04 AM
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I don't have mine on. It needs to go on, I think. One reason is when I went off the track at 50 MPH a while back, I bent my AL cross member. Whatever hooked it might have only messed up the cover if I had it on.
I don't see any structural basis for the thing. Only four bolts. That cant provide much shear, a little maybe. As I said, I thing it's for protection, mainly. Oh, and I guess one ought to look in there once in a while for mud, etc. But that wouldn't be any different that looking forward in your rear wheel wells and seeing what accumulates there. 
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11-28-2005, 09:06 AM
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If you have a fuel pump near the gas tank, I think it'd be stupid to run without it.
It's also an aerodynamic benefit to keep it. It does provide a small amount of shear, which benefits front stiffness. Nothing to lose sleep over, I'm sure. But the aero and safety aspects outweigh the the weight penalty by far. It's also the last place you want to save weight.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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11-28-2005, 11:27 AM
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Through '76 the m/c and lines would be very vulnerable, post, as Tyson mentioned has the fuel pump and lines.
the higher the car sits the more air flows past it, the more it is an aero aid and the more you need to lower or add a diffuser. Porsche(and other manufacturers) go way out of their way to have a smooth/flat bottom on their cars.
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Bill Verburg '76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone) | Pelican Home |Rennlist Wheels |Rennlist Brakes | Last edited by Bill Verburg; 11-28-2005 at 12:31 PM.. |
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11-28-2005, 11:46 AM
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Roger that -
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Jeff |
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11-28-2005, 12:27 PM
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Someone - Thom? - was making these out of CF or FG -- but I don't see that the wt. advantage outweighs the ability to stop rocks -- ever seen an old cover? I had mine powdercoated just to give a bit more "rockability"
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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11-28-2005, 01:01 PM
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Quote:
The streets here in VA are clear of such fodder.-Jeff
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Jeff |
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11-28-2005, 01:36 PM
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aerodynamics and light gravel/weeds on the fuel lines.....
here is a home made aluminum one: 
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914/6 2.0S with twin plug all metal body panels 19quarts of oil 4 gallons of gas and 1826 lbs (wet) |
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11-28-2005, 03:13 PM
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no rally stage -- that is what happens on Oregon hwys - maybe it is the grit they put down for snow, but I rarely drive the 911 on roads within a month of the time it could have snow on it.
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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11-28-2005, 05:10 PM
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I ran over a piece of crap on the high way and tore my master cylinder right off!! Would not have happened if I had my cover on. Maybe leave off for a track only car?
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erik.lombard@gmail.com 1994 Lotus Esprit S4 - interesting! 84 lime green back date (LWB 911R) SOLD  RSR look hot rod, based on 75' SOLD 73 911t 3.0SC Hot rod Gulf Blue - Sold. |
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11-28-2005, 07:14 PM
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Banned but not out, yet..
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When I purchased mine, it was missing the cover. I spoke to my mechanic (he's worked on 911s for 25 years and seen just about everything) and he strongly recommended I get one for debris protection. Aerodynamics was a distant secondary consideration. As far as being a 'chasis stiffener', it never came up. I decided to take the weight penalty. Since then I added a front panel of light-weight tin from the diffuser back to the panel to clean up airflow. Now the bottom of the car is flat from diffuser back to the engine/tranny.
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An air cooled refrigerator. ‘Mein Teil’ |
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11-28-2005, 07:46 PM
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Bruiser
1976 Porsche Carrera 3.0
1995 Porsche 993 Carrera Coupe
Igor
Estrous Express
The Green Piggy
