stig2
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| posted on 2/6/06 at 08:28 AM |
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Sierra upright Mods.
Does anyone have a detailed drawing of the Sierra upright inserts?
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ruudbeckers
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| posted on 2/6/06 at 04:11 PM |
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Does this help?
 
Rescued attachment adapter2.jpg
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flak monkey
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| posted on 2/6/06 at 04:14 PM |
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Hey i recognise that  
I was going to say something, but I have heard that something is wrong with my drawing. Nobody will tell me what though! Which doesnt help, if someone
would then I will put it right!
Cheers,
David
That one you have posted has the wrong balljoint taper on, this one has the right angle on. But my comments above still stand true!
Image deleted by owner
[Edited on 2/6/06 by flak monkey]
Sera
http://www.motosera.com
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JoelP
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| posted on 2/6/06 at 06:44 PM |
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are you sure its 7.125 degrees and not 7? Just a guess 
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flak monkey
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| posted on 2/6/06 at 06:46 PM |
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The angle is an odd one. Its in inches per foot, i cant remember exactly what it is and cant be bothered to work it out at the moment
Sera
http://www.motosera.com
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robertst
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| posted on 2/6/06 at 06:56 PM |
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is this what is meant as reaming the bottom taper out?
i have seen mushroom inserts on GTS. is it the piece you are describing?
Tom
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JoelP
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| posted on 2/6/06 at 07:10 PM |
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not quite robert. With a standard sierra upright, neither top nor bottom are right. The lower taper is wrong, and this is what needs reaming. The top
needs an insert to put a taper at the top.
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Alan B
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| posted on 2/6/06 at 07:19 PM |
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IIRC there are 2 main tapers one is 1 in 6 (2" per foot) and 1 in 8 (1.5" per foot) which I beleive this is, and if so 7.125 degrees is
very close....my calc says 7.125016349
About the drawing...there is no dimension for the diameter at the top of the part.
HTH
Alan
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robertst
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| posted on 2/6/06 at 07:19 PM |
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so, how should i modify my uprights? i really dunno what reaming and taper mean  is it drilling out a bigger hole? or aligning them?
Tom
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JoelP
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| posted on 2/6/06 at 08:46 PM |
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a taper is a wedge shaped hole, you would ream it out to a new angle and size. Most people in the uk get manufacturers to do it, as its not simple for
normal people.
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flak monkey
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| posted on 2/6/06 at 08:49 PM |
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quote:
Originally posted by JoelP
... as its not simple for normal people.
But most of us arent normal!
Sera
http://www.motosera.com
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robertst
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| posted on 4/6/06 at 12:13 AM |
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oh my lord. so that means i cant use my sierra uprights per se. or simple mods... for the sake of simplicity and quickness... is there another
substitute for the cortina uprights?
wait a tick... the problem with the sierra uprights is that they dont fit the ball joints right? or at least they have a different angle to that which
we want for the geometry of a locost right? so wouldnt simply changing the design of the front suspension to fit these uprights tackle this
problem?
would mini uprights do the job? what about miata/mx5? they are being used right?
Tom
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flak monkey
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| posted on 4/6/06 at 06:41 AM |
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I seem to remember hearing that Mk2 Astra ball joins will fit the bottom taper on the sierra upright...
Not sure if its true or not though.
David
Sera
http://www.motosera.com
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Syd Bridge
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| posted on 4/6/06 at 07:53 AM |
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Simple solution is modify the wishbone ends to take spherical joints, then drill the sierra upright straight through for the bolt.
It's what you'll find on most racecars.
Cheers,
Syd.
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JoelP
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| posted on 4/6/06 at 09:03 AM |
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good idea there syd. Either that, or buy an adapter from raceleda (not as expensive as it sounds), this bolts into the lower taper and takes a rose
joint.
For the top, you can just get a pair of mushrooms posted to spain if required.
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robertst
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| posted on 4/6/06 at 11:44 AM |
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i cant believe i'm being so thick on this. please bear with me.
the problem with sierra uprights is that they wont fit transit (top) or maxi-ball (bottom) joints right?
Tom
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JoelP
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| posted on 4/6/06 at 12:59 PM |
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yep, thats the one
this seemingly odd affair stems from the fact that original locosts used cortina uprights, which do indeed fit cortina balljoints (odd that one )
and transit draglinks. However, when people changed to sierra uprights, they kept on using the original joints. No idea why
[Edited on 4/6/06 by JoelP]
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robertst
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| posted on 4/6/06 at 01:39 PM |
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so the solution lies in using the proper ball joints.
why oh why dont we use the sierra balljoints? just get them new from the dealer or another source?
indeed, i could use the sierra joints and adapt them to the wishbones?
[Edited on 4/6/06 by robertst]
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DIY Si
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| posted on 4/6/06 at 04:46 PM |
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Possibly for the bottom joint, but the top one should house the macpherson strut. This is the main problem with the top one. The bottom one may be
because the joint is an integral part of the bottom arm on a sierra, but I'm not sure on this one.
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JoelP
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| posted on 4/6/06 at 05:36 PM |
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correct si
worth using the astra ones if they do indeed fit.
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robertst
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| posted on 4/6/06 at 08:10 PM |
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thanks joel for ur help. i know i could use the bottom sierra joints and just get adapters for the top and thats it. use the transit ones.
Tom
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JoelP
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| posted on 4/6/06 at 08:15 PM |
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sierra lowers are part of the complete track control arm, you would need to either cut it off or use a similar one.
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meany
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| posted on 11/6/06 at 08:00 PM |
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just been reading this thread,,interested about the astra ball joints...i think i will pop over to Halfrauds tomorrow at Dinner when im at work and
see if they will let me measure one..if they have any that is.
these are on ebay.
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leto
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| posted on 12/6/06 at 06:45 AM |
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The astra joint might be to narrow, small end is 13.5 and the sierra has 14 (according to
SIDEM)
“I'm gonna ride around in style
I'm gonna drive everybody wild
'Cause I'll have the only one there is a round”. (J. Cash)
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meany
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| posted on 13/6/06 at 07:38 PM |
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went to Halfrauds,they dont keep them instock.
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