kendo
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| posted on 14/9/09 at 10:22 AM |
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Self Centreing (again - sorry!)
Hi Chaps
Trying to get finish off the list from my SVA fail list. I've pretty much got everything else sorted the only sticking point is the self
centreing.
I've done the usual searches and tried many of the fixes and with lowish tyre pressures a smidge of neg camber and I've done toe out and
toe in, pos camber etc. and the best I am getting is that it starts to unwind the lock from a stand still but nothing of any note once going along.
Fundamentally I realise I probably need more castor angle but i am constrained by the brackets on the chassis and the wishbones I have at the moment.
My questions are :
1. Is what I've got enough to convince the nice SVA man?
and
2. Does anyone do book upper wishbones but with added rearward offset in order to increase the castor (my set up is exactly as per book with cortina
uprights)?
Getting a little dispondant as this is the only item I have not addressed with absolute certainty.
Thank you
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matt_claydon
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| posted on 14/9/09 at 10:26 AM |
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Wozsher is the man to speak to, he will do you a set of wishbones with the correct caster.
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mistergrumpy
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| posted on 14/9/09 at 10:42 AM |
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Wozsher does the top bones as said but as long as the steering attempts to unwind then it'll be fine.
You'll have quite a few people on here saying that it's just wrong and to redo the whole thing for safety etc etc but that aside as far as
the SVA are concerned it just needs to be making an effort.
As a side issue. One of my big problems was the Escort rack being too tight. I cleaned it out and slackened off the damper clutch and it worked
better. You should be able to turn the wheels easily by hand when the cars on stands.
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Dangle_kt
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| posted on 14/9/09 at 11:00 AM |
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Warrens wish b ones are rose jointed so you can move them for and aft as required to get the correct caster just use the supplied washers to move the
whole thing forward or backwards.
I think my rack is a bit tight too.
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Mr Whippy
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| posted on 14/9/09 at 11:08 AM |
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all you need to slacken the rack is some card, cut in the shape of the gaskets that are already there. Really simple to do.
Fame is when your old car is plastered all over the internet
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Macbeast
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| posted on 14/9/09 at 11:16 AM |
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Which gaskets ? Where the input spigot enters the body ?
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mistergrumpy
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| posted on 14/9/09 at 11:28 AM |
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Yep that's the gasket. Just take the cover off and remove the plastic drum. Clean the rack (Haynes recommend pouring a small amount of oil in
through the hole) clean the drum and put it back then use a cardboard gasket to raise the cover slightly off the drum so it's not pressing too
hard.
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Gav
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| posted on 14/9/09 at 11:30 AM |
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What i did was just lossen the two bolts that hold the damper clutch(the bulky bit where the input shaft enters the body) in, by half a turn each,
they are still tight to turn with a socket but really lossened up the rack, after doing this it attempted to self centre.
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Jumpy Guy
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| posted on 14/9/09 at 11:34 AM |
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Does this gasket/loosening fix apply to the sierra rack as well?
if so, then what am i loosening? where the steering shaft inputs into the steering rack? i.e. at the top of the rack?
[Edited on 14/9/09 by Jumpy Guy]
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GaryM
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| posted on 14/9/09 at 11:37 AM |
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Although I built my top wishbones with extra castor giving me 7 degrees, my self centering was always very weak. I always accepted this was the best
you could expect (because of the number of posts regading the subject).
It passed SVA OK but never felt right on the road to the extent it spoilt the car.
One day I decided enough is enough so I jacked the car up and started investigating further.
I found out the lower cortina balljoints were far too stiff (although they were new when I built the car). I replaced them for 2 more new ones
(different manufacturer) and couldn't believe the difference it made. The steering now self centres perfectly.
[Edited on 14/9/09 by GaryM]
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ReMan
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| posted on 18/9/09 at 08:48 PM |
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I keep meaning to look at mine.
especially with a BEC, no weight over the front wheells
I have found that with a brand new/recon rack and joints there is a large amount of sticktion in the set up, which can definatley add up to little
self centring
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