Dan.
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| posted on 13/6/10 at 11:44 AM |
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Mushrooms
I'm looking at fitting my front hubs shortly, Im aware I need to fit a extra locking nut for the mushrooms to pass IVA, but my mushrooms are
offset (hole not drilled in the center) which way round should these be placed? pics would be great, cheers 
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Davegtst
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| posted on 13/6/10 at 11:51 AM |
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Sorry off topic a bit but where did you get the offset ones from please?
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Dan.
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| posted on 13/6/10 at 12:01 PM |
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They came with the part built car which I purchased second hand, Guessing they are not normally offset?
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whitestu
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| posted on 13/6/10 at 12:05 PM |
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MK Ones are offset.
Stu
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Dan.
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| posted on 13/6/10 at 12:19 PM |
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quote:
Originally posted by whitestu
MK Ones are offset.
Stu
Thanks...
Any idea which way round they should be 1/2/3/4 (or somewhere in between?)
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mangogrooveworkshop
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| posted on 13/6/10 at 12:32 PM |
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number 2
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Dan.
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| posted on 13/6/10 at 12:40 PM |
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quote:
Originally posted by mangogrooveworkshop
number 2
thankyou 
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ReMan
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| posted on 13/6/10 at 12:54 PM |
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4 for me
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MkII
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| posted on 13/6/10 at 01:20 PM |
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you cant really say that any one of your illustrations is either correct or incorrect.
1. will give you more negative camber
2. will give you less negative camber
3. will give you less caster angle
4. will give you more camber angle
you need to position your mushroom to optimize your suspension geometry. .m.
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Pezza
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| posted on 13/6/10 at 01:22 PM |
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3 for me, though mine's not on the road yet.
You couldn't pwn your way out of a wet paper bag, with "PWN ME!!" written on it, from the "pwned take-away" which originally contained one
portion of chicken tikka pwnsala and the obligatory free pwnpadom.
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Mark Allanson
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| posted on 13/6/10 at 01:24 PM |
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You cannot change the castor by offsetting the mushroom because the balljoint position will not change.
You alter the camber with the upper balljoint
You need to get maximum trail to get as much self centring out of the sierra knuckle as you can so position 3 is correct.
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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AdrianH
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| posted on 13/6/10 at 02:04 PM |
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Number 4 if building the Haynes Roadster.
Adrian
Why do I have to make the tools to finish the job? More time then money.
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whitestu
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| posted on 13/6/10 at 02:08 PM |
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I've just gone through all this with my modified wishbones and from my experience mushroom position makes sod all difference to self centreing.
On my Indy I needed to design in approx 7.5 degrees of castor to get it to self centre well.
Mine are now as diagram 1, but that is just so I can get the camber settings right on my redesigned wishbones.
Stu
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Dan.
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| posted on 13/6/10 at 07:30 PM |
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might have known it wouldnt be that easy :lol:
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Davegtst
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| posted on 13/6/10 at 07:40 PM |
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quote:
Originally posted by whitestu
MK Ones are offset.
Stu
Cool, i'll be getting them tomorrow then
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Hellfire
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| posted on 14/6/10 at 04:37 PM |
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If you're building an Indy, diagram No 4 is the correct position for the mushrooms.
Phil
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mad-butcher
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| posted on 14/6/10 at 08:07 PM |
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As above no 4, camber is done by upper ball joint (but not very precisely as it can only be adjusted by a full rotation at a time)
tony
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DRC INDY 7
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| posted on 17/6/10 at 08:19 PM |
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Yep i will second or third that no 4 is the setting
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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Dan.
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| posted on 18/6/10 at 02:22 AM |
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No 4 it is, thanking you
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stevegough
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| posted on 20/6/10 at 04:38 PM |
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I think you are all missing a vital point here - it isn't a case of "number x is correct" as you have to view the whole set up -
individual cars, whilst all using the Sierra uprights have the same basic wishbone layout, the 'correct position' for the offset hole
position is determined by the overall view of the whole setup.
In the case of the Luego I'm building, the set up is such that even with a fully screwed in camber adjuster, the camber is still slightly tilted
out (positive) so, to refer to the very nice clear diagrams Dan has posted, mine need to be set up as for position 1 to gain more 'tilt'.
- Even then, it is difficult to get ANY of the desirable negative camber in.
The bottom line is to get it all set up properly with a professional.
HTH, Steve.
[Edited on 20/6/10 by stevegough]
Luego Locost C20XE.
Build start: October 6th 2008.
IVA passed Jan 28th 2011.
First drive Feb 10th 2011.
First show: Stoneleigh 1st/2nd May 2011.
'Used up' first engine may 3rd 2011!
Back on the road with 2nd engine may 24th
First PASA mad drive 26/7/11
Sold to Mike in Methyr Tydvil 19/03/14
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Hellfire
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| posted on 20/6/10 at 04:57 PM |
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The mushroom adapter for the MK should be fitted as diagram No 4 and is offset to provide maximum trail. The MK wishbones are designed so that the top
balljoint can be adjusted to achieve the desired camber and the castor is determined by the setback built into the wishbones and the wishbone mounting
brackets.
Phil
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jacko
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| posted on 20/6/10 at 06:53 PM |
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On a Indy you will want the top wish bone behind the bottom bone looking down so that makes it number 4 if thats the n/side
[Edited on 20/6/10 by jacko]
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Pezza
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| posted on 20/6/10 at 07:23 PM |
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Checked mine today, they are No4 and not No 3 like I said earlier, must of had a brain fart moment.
You couldn't pwn your way out of a wet paper bag, with "PWN ME!!" written on it, from the "pwned take-away" which originally contained one
portion of chicken tikka pwnsala and the obligatory free pwnpadom.
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