Chassis Twist

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Briggsy
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Chassis Twist

Post by Briggsy » Sun Sep 06, 2020 9:16 pm

I have a new old stock chassis, never had a body fitted. After a great deal of measuring, it seems that the main chassis legs are twisted. The offside leg twists upwards by approximately 10mm by the very front.

Has any one got any experience with a twisted chassis? To what extent would the body force it back straight?

I rigged up a 4 way water level and checked against the four corners of the out riggers and used four jacks to lift the chassis to meet the water levels. Three corners lined up well, but the front near side didn't. Moving the front water levels to the anti-rollbar mounts at the very front showed that the twist is in the main chassis legs.
Chassis Checks with Water Level.JPG
Chassis Checks with Water Level
Chassis Checks with Water Level.JPG (108.15 KiB) Viewed 228 times
IMG_3316.JPG
Front nearside chassis leg (at anti rollbar mount)
IMG_3316.JPG (169.44 KiB) Viewed 228 times
IMG_3315.JPG
Front offside chassis leg (at anti rollbar mount)
IMG_3315.JPG (178.21 KiB) Viewed 228 times



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scimjim
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Chassis Twist

Post by scimjim » Sun Sep 06, 2020 9:18 pm

That will be why it’s unused :D

I wouldn’t want to rely on a GRP body to straighten that out - it needs some serious pulling into shape first.


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Briggsy
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Chassis Twist

Post by Briggsy » Sun Sep 06, 2020 9:30 pm

It seems odd to me that they wouldn't check for twist before completing the chassis, but I suppose it was a different time. We are going to at least attempt to pull it straight. No harm in trying :D



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scimjim
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Chassis Twist

Post by scimjim » Sun Sep 06, 2020 9:58 pm

It may have picked up the twist during storage?


Jim King

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Current: SE5 (8Ball), 1400 1600 1800 Zetec ST170 powered SS1 (G97), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre, TI SS1 (snotty), 1600 SS1 (C686CCR).
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tony1966
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Chassis Twist

Post by tony1966 » Sun Sep 06, 2020 10:50 pm

in the real world i doubt that will make a lot of difference tbh-so many ways to adjust and shim the alignment etc

it would be good to get it better if you can,but as long as the body goes on and doors fit ok....

edited to add i bet there is far far worse running around out there,not only scims



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philhoward
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Chassis Twist

Post by philhoward » Mon Sep 07, 2020 4:25 am

Nobody would deliberately make a twisted chassis but that’s no to say it didn’t pick up a twist during the welding, in storage or literally fell off the back of a lorry (we have pictures- it happened to a couple of SS1 chassis :mrgreen: ). As it’s one corner kicked up you wouldn’t get the body to straighten that I don’t think - needs either some cutting and welding or putting on a jig and sorting. Probably doesn’t need to be bang level but less than half of what you’ve got there - IMHO.

As Jim says, that’s probably why it’s unused - perhaps didn’t fit on the tooling/track to actually get built up?


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