big_wasa
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| posted on 20/11/05 at 08:26 PM |
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Bit of chassis info and a a few pics Please......
Ive managed to get a few hours garage time this weekend  Before and after family lunch at mothers...
Ive been reading up on the front geometry, castor of wishbone brackets mainly .Decided id read enough (5 weeks ) and to start welding some bits
together.
Q1) To get the angles I needed on Fu1+2 they sit inboard by about 50mm at the bottom .(see arrow...Will I have problems with steering rack clearance
?
Q2) To get the 6 deg neg castor I wanted the front brackets hang of way to much. I think to much to just to guset it .I had planned on putting a brace
between L and F but this will give very little clearance for the shock.
Can any body send me a pic of steering rack installed in chassis with out body work ect and offer any sugestions.
 
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big_wasa
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| posted on 20/11/05 at 08:27 PM |
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pic 2
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big_wasa
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| posted on 20/11/05 at 08:27 PM |
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pic 3
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Avoneer
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| posted on 20/11/05 at 08:36 PM |
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Hi Warren,
In Pic 2 - you could either weld a tube across between the two brackets, or do what I did and lean the whole front "L" section back
another 1".
All my brackets rest bang in the middle of a tube - bit of work now you are up to this stage now though.
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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paulf
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| posted on 20/11/05 at 09:08 PM |
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Hi Warren
I think you will have a problem with the steering column link to the rack fouling the FU tube. I moved mine inwards at the bottom, at the first
attempt and found that the steering column needed to go through the middle of it and therefore had to adjust the position.
The castor problem looks the same as a book chassis , I ended up having to remake the top wishbones, however as previously stated if I was going to
build another chassis I would add an extra inch of offset to the front tube assembly.
Your easiest option may be to put an extra horizontal tube in each side to support the brackets.
Paul.
Paul
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mark chandler
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| posted on 20/11/05 at 10:07 PM |
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I had similar issues, but as I could not get rid of the bump steer so shortened the rack by 4".
Loads of room now and no bump steer across the entire travel.
I would suggest you ignore the tube in the way in the first instance and check out the bump steer before cutting the chassis.
Regards Mark
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caber
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| posted on 20/11/05 at 10:15 PM |
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Big_Wasa I like the jig set up I have been trying to figure something like this for mounting brackets and setting up wishbones a bit better than the
locost wooden jig! Particularly as I am gas welding!
Caber
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Mix
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| posted on 21/11/05 at 07:15 AM |
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I have inset my FU tubes and there is very little clearance for the steering column. I would suggest you rig up your rack, (even if only temporarily)
before going much further.
Mick
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Avoneer
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| posted on 21/11/05 at 08:48 AM |
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Looking at it, it looke like the steering shaft will want to go right through that bar.
Looks a bit odd.
If you measure the hole centres of the top two brackets (diagonally down and one at a time) down to the middle of the chassis line on the board, are
they definately both the same? (Back one looks further in)
Pat...
No trees were killed in the sending of this message.
However a large number of electrons were terribly inconvenienced.
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James
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| posted on 21/11/05 at 09:11 AM |
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Hi Warren,
Just a couple of points:
Your wishbones don't seem to have much off-set in them. Remember the book is incorrect in saying the off-set should be 11mm to get the 5.5°. For
a 'Book' setup with Cortina uprights the off-set should be 22mm.
Also, ideally, Fu1/2 should be 16mm inboard of the top rail. I can't tell from your picture if this is the case. If they *are* 16mm inboard then
that means the bottom can be more outboard (Fu1/2 can be more vertical) and therefore giving more clearance for the rack.
Hope that helps,
Cheers,
James
------------------------------------------------------------------------------------------------------------
"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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Peteff
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| posted on 21/11/05 at 11:19 AM |
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lean the whole front "L" section back another 1".
I've done that with my present effort. The fu tubes are very far in at the bottom there and as said will be in the way of your steering if you
use a MkII Escort rack. Mine finish 1/4" in at the bottom and don't cause any problems.
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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Peteff
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| posted on 21/11/05 at 12:13 PM |
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Found a picture
Not necessarily what you want but you could weld another piece of 1" box to the side of your 'L' behind where you are mounting the
brackets and block the ends of it. It would be more solid than a bit of gussetting. Cut it off at an angle and it wouldn't look so obvious. /
sort of shape but vertical
 
Rescued attachment rackmount.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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big_wasa
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| posted on 21/11/05 at 08:34 PM |
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Thanks guys and Pete for the pic.
James ive gone for 24mm offset which according to my sums should give me 6 deg neg castor.
Pat yep all 4 wishbones are parallel to the centreline of the chassis and same measurements both sides so should be symmetrical hope .I checked 20 or
more times before welding ,and then again after.
Because of bringing the top bones back ive leaned the Fu tubes back to get good position for the brackets so no room to get Fu inboard at top so has
to be at bottom. Shouldn’t be a problem ive had a few ideas: D
Thanks Mike ive ordered a new rack from rally design today so ill be able to see better when it’s sat in position.
If doing again id move the L assembly back 25 mm but im not going to move it now. Ill just work round it....
Part of the challenge me thinks
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big_wasa
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| posted on 21/11/05 at 08:41 PM |
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Been looking at posts on bracing and think I can kill 2 birds with one chunk of metal: D
If the rack allows enough room ill but a brace in as shown which will also support the bracket
Edit ...The racks ok its the sodding linkage in the way now .....doh
[Edited on 18/12/05 by big_wasa]
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kit Car KIDDA
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 posted on 15/12/05 at 11:00 PM |
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not sure how all this computer stuff works,any ideas on how my second engine is goping to drive the car
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Peteff
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| posted on 16/12/05 at 12:10 AM |
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Use it for a spare after you wear the first one out  .
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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02GF74
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| posted on 16/12/05 at 09:57 AM |
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quote:
Originally posted by big_wasa
ive gone for 24mm offset which according to my sums should give me 6 deg neg castor.
I didn't make my chasis but when I've been looking at moving the raditor I noticed that the lower wishbone mounts are not welded to the
chasis but to a piece of angle iron that is bolted to the chasis. There are slots and from what I can work out this allows the lower wishbone to move
to and thro - a way to adjust the castor?
Seems like a good idea.
If you are interested, I can do pics but it is not that hard to imagine.
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big_wasa
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| posted on 18/12/05 at 09:55 PM |
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Not keen on that idea ! But thanks .
If I do another chassis I will make to book and alter the wishbones instead.
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