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Author Topic: Flexing Firewall  (Read 4917 times)
131grp4
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« on: January 02, 2010, 12:31:06 PM »
As has just been pointed out on another thread, the firewall flexes to quite some degree, I remember this myself thinking about it, question is, did the works cars do anything about this or has anyone here felt the need to, although perhaps this is only noticeable when no servo is used and more pressure is applied to the brake pedal?
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Kennedy of Sixmilebridge
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all-italia.net


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« Reply #1 on: January 04, 2010, 07:29:28 PM »
Use a stopper. It stops the firewall flexing so much.

The picture is hopefully self explanatory.

Bolt the end of the master cylinder to the turret
so as it pushes against the turrent and not just
the firewall / bulkhead.
« Last Edit: January 04, 2010, 07:51:25 PM by Kennedy of Sixmilebridge » Logged
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mirafioriman
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« Reply #2 on: January 04, 2010, 09:54:57 PM »
Neat idea. Don't think I have seen that before.
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My name is David Hobbs and I currently own: Fiat 130 berlina, Fiat 131 Supermirafiori, Fiat 131 Panorama, Fiat 132 2000, Fiat Argenta, Mercedes 300SEL 6.3, 450 SEL 6.9 a 420 SEL, Citroen Xantia
miro-1980
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« Reply #3 on: January 04, 2010, 10:56:21 PM »
Gents

Now this is what I call real rally/race  engineering!

With all respect to my contemporary car engineers this does not look like a XXI st century solution:

- no plastics ,
- no electronics, chips , computers
- no complex moving pats\
- no patents , Trade Marks , Intellectual Property rights, licenses...
   
- does the job and will last forever!

A true XX th century technical achievement !
 
Must be a blacksmith's solution: build with a strength of a jack hammer and so simple , anybody can build one in his garage. 

Absolutely perfect !

Thanks

Miro

BTW: anybody has more of these simple solutions : Come forward please !

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Fiat Abarth 131 Rally Gr4 1976 (replica)
Fiat 124 Abarth Rally Gr4 1973 (replica)
sid131
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« Reply #4 on: January 05, 2010, 08:06:10 AM »
Steve standard road car or a race prepared 131?
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miro-1980
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« Reply #5 on: January 05, 2010, 11:37:01 AM »
Steve,

Vary interesting again. You are a goldmine of firsthand information on Abarth. This is invaluable!

Please share those experiences with us, whenever you can.   

Now I understand why Abarth has revised the pedal box construction on its competition vehicles the same year that they introduced the car.

Steve :

1/ do you know the solution they used than?

2/ do you know a solution to this problem that can be applied today (for safety)

3/what about the fixed caliper v.s floating caliper issue. Could you elaborate, please   
   

Miro
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Fiat Abarth 131 Rally Gr4 1976 (replica)
Fiat 124 Abarth Rally Gr4 1973 (replica)
131grp4
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« Reply #6 on: January 06, 2010, 01:09:13 PM »
But there isn't anything about reinforcing the fire wall.
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djape1977
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« Reply #7 on: January 07, 2010, 11:40:19 PM »
Quote from: fiatfactory on January 05, 2010, 04:54:46 AM
131 woyuld require a slightly different solution as the line for the rear brake circuit comes out of the front (the end) of the master cylinder... but something along these lines would do the trick.

I simply plated the firewall around the master cylinder / booster mounts on the cars I've done... the standard sheetmetal is quite thin and bends quite a lot if you have a strong right leg.

SteveC

use the master brake cyl. for lada. it has connection for rear brakes on the top and everything else is the same as on 131. bolts straight on to 131's brake servo.
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get a bigger hammer!
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