Torsional Rigidity... question for Brad, Can you post pics when you find time? |
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Torsional Rigidity... question for Brad, Can you post pics when you find time? |
Rusty |
Oct 13 2003, 02:23 PM
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#1
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Wanted: Engine case GA003709 Group: Admin Posts: 7,952 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
Brad,
Once upon a time, we talked about a method to increase torsional rigidity by reinforcing the lower inner firewall and insides of the longitudinal. Can you post some pictures to show this method? I've looked around, and can't seem to find any. -Rusty (IMG:style_emoticons/default/smoke.gif) |
Jeroen |
Oct 13 2003, 02:30 PM
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#2
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
I could be wrong, but I think what was reinforced was the area where the heaterducts come out of the long, not the front firewall.
But like I said, I could be wrong... wouldn't be the first time (IMG:style_emoticons/default/biggrin.gif) cheers, Jeroen |
SirAndy |
Oct 13 2003, 02:38 PM
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#3
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Jeroen @ Oct 13 2003, 01:30 PM) wouldn't be the first time (IMG:style_emoticons/default/biggrin.gif) and not the last time (IMG:style_emoticons/default/smile.gif) he (brad) was talking about the rear firewall. U-Shaped brace (well, sort of) from long to firewall to center tunnel. Andy |
Rusty |
Oct 13 2003, 02:39 PM
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#4
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Wanted: Engine case GA003709 Group: Admin Posts: 7,952 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
That might have been another reinforcement.
The idea, IIRC, was to take a continuous piece of sheet metal, and wrap the inside of the passenger compartment. The metal covered one long to the other, going along the lower edge of the firewall (back of the seats), in a gigantic U shape. -Rusty (IMG:style_emoticons/default/smoke.gif) |
Mueller |
Oct 13 2003, 02:46 PM
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#5
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914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
Hey Rusty......
I too am interested in this, as much as I'd like a TC Design cage, I don't think I need to go that route (cost, and turning the 914 into a daily driver, I need and want to be able to easily get in and out of the car....) Hopefully Tony C can chime in on this to see what his professional recommendations are to stiffen the car up without going all out with a cage. I've heard of some people welding tubes(round and square) along with sheets/plates of steel to the inner tunnel and the outer longs to help stiffen it up. It would seem that almost any additional reinforcment would help, but the key is to optimize the designe and placement. I thought Brad said the cars flex the most right at the floor area below the mirror on the window. HTH Mike |
Jeroen |
Oct 13 2003, 02:50 PM
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#6
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
Ok, I have a hard time visualizing this... (IMG:style_emoticons/default/blink.gif)
BRAAAAAD... PICTURES PLEAAAAZZZZE ! ! ! (IMG:style_emoticons/default/biggrin.gif) cheers, Jeroen |
Rusty |
Oct 13 2003, 02:53 PM
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#7
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Wanted: Engine case GA003709 Group: Admin Posts: 7,952 Joined: 24-December 02 From: North Alabama Member No.: 6 Region Association: Galt's Gulch |
I agree that *almost* any stiffening is good.
But Brad Mayeur warned me years ago about making some areas too stiff. Using metal that's too too thick in an area that traditionally flexes can causes rips/breakage in an adjacent area. I look at it like the (alleged) dangers of boxing the trailing arms... The stress has to go somewhere, right? Better the trailing arm than the suspension console. Just my opinion, Rusty (IMG:style_emoticons/default/smoke.gif) |
Jeroen |
Oct 13 2003, 02:53 PM
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#8
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
QUOTE(Mueller @ Oct 13 2003, 10:46 PM) I thought Brad said the cars flex the most right at the floor area below the mirror on the window. See... I'm not the only idiot on this BBS tonight (IMG:style_emoticons/default/biggrin.gif) cheers, Jeroen |
SirAndy |
Oct 13 2003, 02:57 PM
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#9
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Mueller @ Oct 13 2003, 01:46 PM) and turning the 914 into a daily driver, I need and want to be able to easily get in and out of the car....) actually, the top bar comes in very handy for getting in and out of the car. as long as your arms are strong enough to lift your belly (IMG:style_emoticons/default/laugh.gif) Andy |
SirAndy |
Oct 13 2003, 02:58 PM
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#10
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Resident German Group: Admin Posts: 41,815 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Jeroen @ Oct 13 2003, 01:53 PM) See... I'm not the only idiot on this BBS tonight (IMG:style_emoticons/default/biggrin.gif) we need a "idiot" smiley (IMG:style_emoticons/default/smile.gif) |
Jeroen |
Oct 13 2003, 03:31 PM
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#11
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
QUOTE(SirAndy @ Oct 13 2003, 10:58 PM) we need a "idiot" smiley (IMG:style_emoticons/default/smile.gif) Yeah, so I can make that my avatar (IMG:style_emoticons/default/biggrin.gif) cheers, Jeroen |
Brett W |
Oct 13 2003, 03:37 PM
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#12
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
According to Richie Ginther and Lcokheed Martin the 914 flexes the most in the middle of the door openings. thus the style cage that they used in the early BP cars. They did not use the NASCAR door bars , those cages were very simple affairs. This is one of the reasons, I haven't put an Autopower cage in the car. they are not as effective as they could be.
From looking at my crash damage I get a better idea of what happens to the 914 chassis when it is loaded. Obviously this is an extreme way to find out but.... The big thing to me is the way the chassis tries to twist when loaded through the rear suspension mounts. The thought that the trailing arms are flexing in is false. The trailing arms do not push inward under cornering, they twist up and down. |
Mueller |
Oct 13 2003, 03:46 PM
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#13
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914 Freak! Group: Members Posts: 17,150 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
Brett, what did happen with your crash...street, track, driveway?????
I don't remember reading about it......... |
brant |
Oct 13 2003, 04:17 PM
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#14
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914 Wizard Group: Members Posts: 11,739 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
I remember the comment about the firewall point being weak too...
I'm just positive about it (one anyways) being a weak point.... I even incorporated additional bracing in this area to my roll bar pads.. (my new and improved cage) my back roll bar pad wraps over the side- runs forward on one side, and to the rear it makes the corner and runs towards the center of the car.. brant |
Brett W |
Oct 13 2003, 04:59 PM
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#15
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
Mike,
I slid over a curb sideways and kinda backwards at around 70mph. |
Jeroen |
Oct 13 2003, 06:57 PM
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#16
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914 Guru Group: Members Posts: 7,887 Joined: 24-December 02 From: The Netherlands Member No.: 3 Region Association: Europe |
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Aaron Cox |
Oct 13 2003, 07:18 PM
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#17
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Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
QUOTE(Brett W @ Oct 13 2003, 03:59 PM) Mike, I slid over a curb sideways and kinda backwards at around 70mph. OUCH how did you manage that? spin? - we need a towtruck/ambulance smiley! |
Brett W |
Oct 13 2003, 09:04 PM
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#18
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Advanced Member Group: Members Posts: 2,858 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
F$%@# Dunlop Sp8000 tires on cold pavement and driving to hard for the conditions at hand. The tires were shot at 10k and I was still running them at 12k they were hard as hell and I knew better, but this guy was pushin' hard and I couldn't have that. Damn learned the hard way.
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Bleyseng |
Oct 13 2003, 10:32 PM
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#19
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Aircooled Baby! Group: Members Posts: 13,036 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Hmmm, I have those too and they have about 12K on them. Yep, they are slippery on cold mornings or wet roads.
But no worse than the Kuhmos Victoracers.... Geoff |
maf914 |
Oct 14 2003, 01:40 PM
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#20
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Not a Guru! Group: Members Posts: 3,049 Joined: 30-April 03 From: Central Florida Member No.: 632 Region Association: None |
Here is the thread that Brad described the stiffening mods that he recommended. Check the third page, about halfway down.
http://www.914world.com/bbs2/index.php?act...&hl=stiff&st=40 "Your can strengthen your frame rails by adding one or two of the following: 1. outside clam shell behind rocker from Restoration design 2. Brad Mayeur clam shells (more for rust repair)..but you get the same effect..they are crude however compared to the form fitting of no. 1. on the list. 3. weld flat steel in a U shape from one side to the other on the INSIDE of the tub. It all gets hidden with carpet when you use 16 gauge. The U shape starts at the bottom of the fenderwell and wraps all the way around to the other fenderwell. You can weld it on every few inches. It takes some work to get around the E-brake setup.. and to get over the center tunnel on the firewall... but it works MUCH better than No. 1. and No.2 because you have now tied both sides of the car together with a very strong piece (lower firewall)." Mike |
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