DONALD
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| posted on 7/9/05 at 04:03 PM |
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using Escort McPherson struts
Has any one used Escort McPherson struts on a Locost Build is so what are the pitfalls, at what lencth are theu cut off and what mushrooms are used?
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MikeRJ
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| posted on 7/9/05 at 04:22 PM |
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I presume you mean the Mk1/Mk2 Escort upright?
The Mchperson strut is actually part of the upright, unlike the Sierra so you would have to devise some way of clamping a mushroom insert in after you
have chopped off the strut tube. It would be far simpler to use the cheap/readily available Sierra uprights (or if you can find a set, the Cortina
ones).
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DONALD
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| posted on 7/9/05 at 06:23 PM |
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What I was thinking of doing was to turning inserts like the mushrooms from steel and tap a thread in to then and welding them into place permanently.
This would mean a central hole and permanent position. The question is then what does this do to the geometry of the suspension?
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britishtrident
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| posted on 7/9/05 at 07:40 PM |
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quote:
Originally posted by DONALD
What I was thinking of doing was to turning inserts like the mushrooms from steel and tap a thread in to then and welding them into place permanently.
This would mean a central hole and permanent position. The question is then what does this do to the geometry of the suspension?
The geometry shouldn't be to bad but -
It would only work if you used a rose joint.
Alternatively you could make a threaded adaptor to take early Metro/Late Mini balljoints and make upper wishbone end from a Mini lower wishbone.
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NS Dev
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| posted on 7/9/05 at 08:18 PM |
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quote:
Originally posted by DONALD
What I was thinking of doing was to turning inserts like the mushrooms from steel and tap a thread in to then and welding them into place permanently.
This would mean a central hole and permanent position. The question is then what does this do to the geometry of the suspension?
Sylva cars did this for many years, but reamed out the adaptor with a tapered reamer to suit a transit draglink end like we use in the top of a
cortina upright.
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NS Dev
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| posted on 7/9/05 at 08:21 PM |
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quote:
Originally posted by Mark Allanson
quote:
Originally posted by gazza285
What you are saying is "when you compensate for this" I am saying "when you design proper wishbones for Sierra uprights"
It doesn't matter what design upper wishbones you have, if you have offset inserts, and alter the position, you will have a change in camber,
which, when corrected will give a change in KPI
CORRECT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
what the hell was this all about!!!! Jeeezus chriiiiiiiisssssst!
If you get in that much of a muddle for god's sake don't build a bloody car or you'll kill somebody!!!!
Sorry Mark, I know you were being more "restrained" in your answers!
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JoelP
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| posted on 7/9/05 at 09:20 PM |
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the point i always make, is that castor doesnt change, only the drag.
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NS Dev
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| posted on 8/9/05 at 07:02 AM |
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drag = kpi? I've never heard the term before?
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JoelP
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| posted on 8/9/05 at 05:53 PM |
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as far as i can remember, drag is a made up word to represent the distance from the contact patch centre to the centre of the steering axis, on the
ground.
how real an effect it is is open to debate.
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NS Dev
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| posted on 8/9/05 at 09:16 PM |
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ahhhhhhhhhh, now that's different again!!!
That is scrub radius!
Changes the kickback at the steering wheel and the self centreing to some degree, but is fixed by wheel offset, nowt to do with the top balljoint
really.
Main influence on scrub radius is wheel offset used.
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MikeRJ
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| posted on 8/9/05 at 09:21 PM |
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quote:
Originally posted by NS Dev
ahhhhhhhhhh, now that's different again!!!
That is scrub radius!
It is if you are talking about how far outside or inside of the wheel that the line falls. Joels "drag" is the distance between the
contact patch and the line in a longitudinal direction. This is affected both by castor angle, and by how far away from the center line the stub axle
is mounted (which is what the mushroom changes). Don't know what the correct term for it is, if any.
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Triton
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| posted on 9/9/05 at 07:17 AM |
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The mushrooms need to be fully cooked or allsorts of weird things happen...
Why nobody has made them like the head bearing/rake adjuster on "tricky" bikes i don't know.......or have i just sparked an idea
again and missed out or talking complete rubbish again
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Peteff
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| posted on 9/9/05 at 09:44 AM |
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Tricky bikes
These ones?
 
Rescued attachment tricky bike.jpg
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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JoelP
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| posted on 9/9/05 at 05:43 PM |
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mike has it right, though obviously nsdev is correct about scrub radius too.
The best way to describe it is by comparing it to shopping trolley wheels, which obviously self centre because the steering pivot is far in front of
the centre of the wheel. I believe alan b has used the term drag in the past too, though he might've just been refering to a good night out
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MikeRJ
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| posted on 9/9/05 at 09:33 PM |
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quote:
Originally posted by JoelP
I believe alan b has used the term drag in the past too, though he might've just been refering to a good night out
Maybe a w/e job
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