 alloy cross member, How much weight does it really save? |
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| blabla914 |
 Aug 30 2009, 02:20 PM
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#1
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I like primer  Group: Members Posts: 321 Joined: 1-March 04 From: Connecticut Member No.: 1,740 Region Association: None 
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curious to know how much weight is saved with this change. Anybody know?
Thanks, kelly |
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| john rogers |
Aug 31 2009, 06:21 PM
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Senior Member Group: Members Posts: 1,525 Joined: 4-March 03 From: Chula Vista CA Member No.: 391 |
Probably does not save any weight but it will allow you to bolt in a 23mm master cylinder if you ever need to.
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| SirAndy |
Aug 31 2009, 06:38 PM
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#3
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Resident German Group: Admin Posts: 41,607 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(blabla914 @ Aug 30 2009, 12:20 PM)  curious to know how much weight is saved with this change. Anybody know? Not much at all and in a position where it does not matter much. About as low in the car as you can get. Plus, i have seen them flex while mounted in a 914. I got rid of mine and went back to the steel cross member. (IMG:style_emoticons/default/shades.gif) Andy |
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| blabla914 |
Sep 1 2009, 11:21 AM
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#4
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I like primer Group: Members Posts: 321 Joined: 1-March 04 From: Connecticut Member No.: 1,740 Region Association: None
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Hmm. That's an interesting fact I didn't know about with the master. Thanks John.
Andy, I agree even if it saved quite a lot of weight it's not really in an area where you need to save it. I'm curious about the flex issue. What were the signs it was flexing? Thanks, Kelly |
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| SirAndy |
Sep 1 2009, 01:24 PM
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#5
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Resident German Group: Admin Posts: 41,607 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(blabla914 @ Sep 1 2009, 09:21 AM) What were the signs it was flexing? We were standing around the lift watching it twist while the steering wheel was turned ... (IMG:style_emoticons/default/blink.gif) Andy |
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| slow914 |
Sep 13 2009, 01:48 AM
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#6
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Member Group: Members Posts: 150 Joined: 5-February 08 From: Kirkland, WA Member No.: 8,671 Region Association: Pacific Northwest |
We put a steel cross member back on a early 911 this summer as the hole keeping the torsion bar adjustment screw in broke open while AXing with an aluminum cross member
He said he pulled in after the run and a track marshal came and handed his torsion bar to him (IMG:style_emoticons/default/biggrin.gif) He barely noticed it was gone with the 22mm tarret ha |
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| CliffBraun |
Sep 13 2009, 02:19 PM
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#7
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Member Group: Members Posts: 252 Joined: 26-April 06 From: San Luis Obispo,ca Member No.: 5,933 Region Association: None |
You're probably saving about 10 pounds (disclaimer, number pulled straight out of ass). If you have a steel one sitting around you can weigh it and the aluminum one is gonna be about 1/3-1/2 the weight (if they were identical it'd be closer to 1/3, pretty sure they're not).
I've never had any problems with the aluminum one on my car, but fatigue for aluminum is different than that of steel, and it's important to be aware of that. Andy, There had to have been something else wrong with that bar. I may have to put my car on the lift sometime this week and check that out. |
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| Joe Ricard |
Sep 13 2009, 06:46 PM
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#8
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
I'm thinking of filling my steel one with lead shot. If I have to add weight to the car to make it class legal The tube is where I want to put it.
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