JeffHs
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| posted on 17/5/08 at 05:15 PM |
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Self centring - again
Well I've spent a week chopping the body work off, grinding off the top wishbone mounts, fabricating new mounts 25 mm further back, so
I've now got 5 degrees of caster, and re-skinned the body, and the sodding thing still doesn't self-centre.
Admittedly only tested in the driveway - daren't risk a road test, with my luck I'd get nicked like Fatty Soames.
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philw
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| posted on 17/5/08 at 05:32 PM |
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We are talking negative caster? i thought three degrees was about right
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paulf
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| posted on 17/5/08 at 06:05 PM |
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I modified my wishbones to give 5 deg as the book measurements are wrong.
I find it does self centre but not as much as a modern tin top however it did pass sva and ive never had a problem with it.
Paul.
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nitram38
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| posted on 17/5/08 at 06:51 PM |
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Why didn't you remake the top wishbone rather than move the mounts?
All though not a 7 my F1-2 has 7 degrees of castor and it centers well.
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pajsh
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| posted on 17/5/08 at 07:49 PM |
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When mine failed SVA I measured it and it was about 2.5 degrees (book chassis so probably built wrong).
Modified the top bones and set up about 6 degrees and it passed OK.
I also used all the toe out/tyre pressure tricks but I'm not sure they made a big difference. Feels much the same now I've set the
pressures and toe in back.
I used to be apathetic but now I just don't care.
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Bob C
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| posted on 17/5/08 at 07:59 PM |
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Just remaking the 'bones can give clearance problems between the 'bone tubes & the spring - otherwise it's a choice of
what's easier - remake wishbones or move brackets.... tough call!
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adithorp
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| posted on 17/5/08 at 08:50 PM |
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Unless you drive it you'll not know. It only has to have "a degree of self centering". They test it by driving on almost full lock
and let go of the wheel. You won't notice that on the drive.
adrian
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RazMan
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| posted on 18/5/08 at 05:56 AM |
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I thought mine would fail (about 5 degrees castor but stiff) but luckily it passed without issue.
As said, Mr SVA will mostly test on full lock and most cars will have a small amount of self centreing like that anyway.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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saigonij
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| posted on 18/5/08 at 08:05 AM |
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what about springs at the end of the steering rack - i dont know the exact details but i swear i read it on here somewhere...
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Mark Allanson
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| posted on 18/5/08 at 12:04 PM |
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quote:
Originally posted by saigonij
what about springs at the end of the steering rack - i dont know the exact details but i swear i read it on here somewhere...
A total bodge, better to do the job right, this may help
http://locostbuilders.co.uk/viewthread.php?tid=89365
It seems that the self centring issue applies mainly to sierra hub carriers, tina ones do not seem to have the same problems
If you can keep you head, whilst all others around you are losing theirs, you are not fully aware of the situation
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