dj_gos
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| posted on 27/8/06 at 05:20 PM |
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front wishbones
Can i use standard wishbones built to the book design with a +4 chassis, sierra steering rack and cortina hubs, or will i have to use longer
wishbones?
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JoelP
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| posted on 27/8/06 at 05:27 PM |
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your choice mate. I believe you're 'meant' to use standard bones though, if you had a plus 4 chassis and still used longer bones,
you would have a monster of a car! With a +4 car the sierra rack will still need modifying though, although less crucially that with a standard car.
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dj_gos
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| posted on 27/8/06 at 05:31 PM |
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what is the best way of modifying? will it have to be done by a specialist and cut nad shut in the middle or can the track rods be shortened?
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JoelP
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| posted on 27/8/06 at 05:53 PM |
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to cut short a long subject, the rack needs to be certain dimensions to minimise bump steer. The knuckles at the inner end of the arms need to be
roughly in a line with the upper and lower wishbone inner pivots. On a standard car this means the middle part of the rack needs to be roughly 17
inches long. Plus 4 id guess it to be 21", but maybe it doesnt work like that.
You then need to modify the arms to be the correct length. Welded arms are an MOT fail so you need to make a threaded extender.
Its possible that an escort mk2 rack is nearly the correct length as standard, but thats only a guess from memory - IMHO the escort mk2 rack is too
long for standard cars, but this has been disputed in the past. Mine certainly bump steered badly, but it was excaberated (sp?) by negative castor
etc.
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zetec7
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| posted on 28/8/06 at 03:25 AM |
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To shorten the rack, take it to a specialised machine shop. It's worth the extra cost, because: 1) your life depends on it, and; 2) cutting
and welding the rack housing (especially if it's aluminium) is a tricky job for an amateur, since it needs to be precisely done so it
won't bind, and; 3) the end of the rack shaft itself should be cut & properly machined, so as to properly attach to the track rods. This
is one of the jobs NOT to do the "Locost" way!!
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