907
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| posted on 8/12/05 at 07:16 PM |
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Castor. Remaking W/Bones
Hi All,
I downloaded a diagram of a top bone that had an offset of 22 mm instead of 8 mm.
I'm not sure who posted it now, (possibly Mark?) and I suppose I'm looking for
conformation that this mod will improve self centering on a book chassis.
I'v made a jig and got the first one tacked up, (see pic. the one on top is the old one),
and I wondered if anyone had actualy made and fitted them with success.
Any help will be much appreciated.
Cheers
Paul G
p.s. sorry the second pic is a bit out of focus.
 
Rescued attachment wish-bone-jig-s.jpg
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emsfactory
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| posted on 8/12/05 at 08:14 PM |
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I had to remake my top bones on friday. Dont know how well the pic will work.
Moving the center this far actually made my car fun instead of scary to drive.
 
Rescued attachment PICT0088.JPG
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David Jenkins
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| posted on 8/12/05 at 08:18 PM |
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My top bones were modified for extra offset (can't remember how much - about 20mm I think). Self-centres a treat, and no issues at the SVA.
David
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NS Dev
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| posted on 8/12/05 at 08:38 PM |
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will shortly be amking rose jointed top bones for mine to achieve similar (by eye!!) to what you have 907
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Viper
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| posted on 8/12/05 at 09:13 PM |
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I made my top bones to have adjustable castor.
Not as much as 20mm though
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paulf
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| posted on 8/12/05 at 09:17 PM |
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Looking at the photo I think you may also find that if you fit the dampers the other way up it will also help the handling a lot.
Unless it is a gas filled monoshock it is unlikely to work correctly with the adjuster at the top.
Paul.
quote:
Originally posted by emsfactory
I had to remake my top bones on friday. Dont know how well the pic will work.
Moving the center this far actually made my car fun instead of scary to drive.
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907
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| posted on 8/12/05 at 09:27 PM |
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Well I've just splodged some weld round it and done a quick fit.
I must say it looks a lot, (see pic, taken from directly above)
but I suppose the proof of the pudding is in the driving.
What do you think of it so far? 
Thanks for the replies.
Paul G
 
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Mark Allanson
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| posted on 8/12/05 at 10:17 PM |
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I have a picture just like that
 
Rescued attachment FrontSusp.jpg
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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Mark Allanson
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| posted on 8/12/05 at 10:23 PM |
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The self centring is upto production car standards, nice easy drive
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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907
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| posted on 8/12/05 at 11:57 PM |
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Camera angles are misleading, but it looks like I may have a tad more than you Mark.
I'm itching for a test run.
Paul G
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Dusty
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| posted on 8/12/05 at 11:58 PM |
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Looks right. Driving a car without self centering is a pain on long journeys when you have to actively steer the whole time.
Remember you will have to readjust camber and toe in. The steering arm on the hub carrier is also slightly moved higher and it may be necessary to
shim up the rack to eliminate bump steer.
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Mark Allanson
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| posted on 9/12/05 at 12:08 AM |
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quote:
Originally posted by 907
Camera angles are misleading, but it looks like I may have a tad more than you Mark.
I'm itching for a test run.
Paul G
I think it is the camera angles, I made mine with exactly 22mm setback, and it looks like you used my drawing so they should be the same
 
Rescued attachment Wisbone Modification.JPG
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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907
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| posted on 9/12/05 at 12:28 AM |
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That's the one.
Now I know who's it was I can say thanks.
Cheers
Paul G
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Mark Allanson
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| posted on 9/12/05 at 11:54 AM |
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Do you like the cad system I used, very easy to master
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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NS Dev
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| posted on 9/12/05 at 04:19 PM |
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quote:
Originally posted by 907
Camera angles are misleading, but it looks like I may have a tad more than you Mark.
I'm itching for a test run.
Paul G
Cameras are very misleading on this! I took a photo of my grasser that somehow made it look like it had negative caster, when I know it has well over
5 deg of positive!
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907
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| posted on 9/12/05 at 04:49 PM |
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Yup, love the cad system Mark.
I'v just got the hang of a pencil myself, even the "edit" bit on the blunt end.
Thanks for all the help everyone.
I'll make a matching one for the other side and take it for a spin over xmas.
While I was on the saw / pipe bender / lathe, I made enough bits to do six,
(slack spell at work) so I'v got three chances to get it right. 
Thanks again
Paul G
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Avoneer
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| posted on 9/12/05 at 06:06 PM |
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Or you could rose joint it - I did it this way to make it easier:
Pat...
 
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No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Viper
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| posted on 9/12/05 at 06:28 PM |
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Trouble with rose joints is they do tend to make the ride a bit harsh....and of course the cost.
[Edited on 9/12/2005 by Viper]
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Avoneer
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| posted on 9/12/05 at 08:15 PM |
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Got a great deal on the joints from TadLTD and as I'm using 60 series 13's, it can't feel any worse than the Avon did!
At least I'll have some suspension travel this time 
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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Viper
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| posted on 9/12/05 at 08:17 PM |
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quote:
Originally posted by Avoneer
Got a great deal on the joints from TadLTD and as I'm using 60 series 13's, it can't feel any worse than the Avon did!
At least I'll have some suspension travel this time
Pat...
this time? didn't you have in the avon then?
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NS Dev
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| posted on 10/12/05 at 10:27 PM |
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quote:
Originally posted by Avoneer
Or you could rose joint it - I did it this way to make it easier:
Pat...
Your postings were the final persuasion I needed to decide to make a jig for new 'bones with rose joints and appropriate scope for caster
adjustment. Just cut a nice lump of 8mm plate out with the big grinder for another welding jig for another project (anybody need some CD deckstands to
mount CD decks behind vinyl decks??) and did an extra piece for the wishbone jig!, but alcohol seemed a better option now!!!...................Anybody
want some std Stuart Taylor upper 'bones with polybushes???
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Avoneer
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| posted on 10/12/05 at 10:48 PM |
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Bloody hell - it's not like anyone to listen to me - I'm normally the student!
I though it was a good idea though!
Viper - all the front shocks supplied with all the Avons I know were too short and with the bottom bones parallel, the shocks were fully compressed
and resting on the small bump stops - that's why most Avon you see are jacked up at the front.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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907
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| posted on 13/12/05 at 07:07 PM |
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Jig
I had a request for a pic of the jig.
It's now in my photo archive, although Mark should get the credit for the mod to the book dims.
Chris, you have an email.
Paul G
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Viper
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| posted on 13/12/05 at 07:37 PM |
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quote:
Originally posted by Avoneer
Viper - all the front shocks supplied with all the Avons I know were too short and with the bottom bones parallel, the shocks were fully compressed
and resting on the small bump stops - that's why most Avon you see are jacked up at the front.
Pat...
never knew that, not surprised though....
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907
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| posted on 26/12/05 at 05:47 PM |
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New Wishbones on Test
Hi All,
After Christmas lunch we, that is the chap next door, my son Gaz, and myself,
thought it would be a perfect time to test the new bones.
Better than sitting about getting indigestion, (or washing up).
So complete with paper hats it was off for a quick blast. I hope no one saw us.
The 22 mm offset's were a huge improvement, but still not as much self centering
as a production car.
I've had a measure and I make them 7.1 deg, (see diagram), although it's not easy
to measure from the ball joint centres.
Does anyone think I could go more? If so, how much?
Many thanks
Paul G
p.s. we all lost our hats, need a windscreen.
[Edited on 26/12/05 by 907]
 
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%20(WinCE).JPG)
