slopecombat
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 posted on 18/5/07 at 10:16 PM |
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Can I do this ?
I've got a pair of SAAB 900 uprights. They look similar to Cortina ones except for the position of the arm that links with the steering bar.
In the Cortina's ones is in the front and in the SAAB ones is in the rear.
Can I rotate the uprights ?
regards,
Modesto
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BenB
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| posted on 18/5/07 at 10:37 PM |
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As long as the kingpin inclination angle isn't FUBARd it should be fine.....
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scoop
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| posted on 18/5/07 at 10:50 PM |
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FUBARD.... IVE ALWAYS LOVED THAT
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Bob C
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| posted on 18/5/07 at 10:59 PM |
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Find out what you can about "ackerman" then decide...
If you do it you probably won't be able to design out the resulting tyre scrub when cornering . . . . but some folk actually reckon that's
a good thing!!
cheers
Bob
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12a RX-7
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| posted on 18/5/07 at 11:20 PM |
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can you not fit a rear steer rack and make sure your engine is nice and far back to clear it ... or notch the sump to clear the rack.
some production cars run anti ackerman and allsorts of odd combinations .... they do spend a large fortune of money deciding on these things though.
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BenB
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| posted on 19/5/07 at 07:12 AM |
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King pin inclincation (KPI) = Ackerman
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flak monkey
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| posted on 19/5/07 at 08:26 AM |
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quote:
Originally posted by BenB
King pin inclincation (KPI) = Ackerman
Umm, no, not really.
KPI is the angle between the upper and lower balljoint from vertical with zero camber. (NOT camber). KPI helps with self centreing.
Ackerman is essentially to do with the angle of the steering arm from the upper ball joint when the wheels are pointing straight ahead. You can have
positive and negative ackerman. It results in one wheel turning slightly more than the other in cornering.
Those arent the best descriptions, but I cant be bothered/dont have time to do a doodle at the moment.
David
Sera
http://www.motosera.com
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dilley
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| posted on 19/5/07 at 09:12 AM |
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flak where do you get your avatars from??
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MikeR
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| posted on 19/5/07 at 09:44 AM |
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hi g/f poses for him !!!
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flak monkey
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| posted on 19/5/07 at 10:30 AM |
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quote:
Originally posted by MikeR
hi g/f poses for him !!!
Yeah right 
Thats Apena - google it with safe search turned off... Some more in my archive
Sera
http://www.motosera.com
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Doug68
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| posted on 19/5/07 at 06:20 PM |
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I don't see that there's going to be any issues doing this.
The KPI will remain the same when swapped from one side to the other and the right castor - camber is a function of the wishbone design.
Look at this for the Ackermann definition.
This is good introductory reading too.
The importance of Ackermann appears to be minimal at anything other than slow speeds where tyre scrub is an issue due to the big steering angles that
occur then.
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slopecombat
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| posted on 19/5/07 at 11:17 PM |
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Then ...
I think it will be better if I don't contradict Mr. Ackerman, Mr. Toe, Mr. Camber & Mr. Castor.
I'm not sure if this configuration will displease Mr Disk Brake too.
I'll follow Mr. Saab design.
Thanks.
Modesto
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MikeRJ
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| posted on 20/5/07 at 12:05 AM |
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quote:
Originally posted by Doug68
The importance of Ackermann appears to be minimal at anything other than slow speeds where tyre scrub is an issue due to the big steering angles that
occur then.
The problem with turning rear steer hubs around to get front steer is that you get anti-ackerman geomtery, i.e. the inside wheel will turn less than
the outside one. This can't be conducive to good road manners...
[Edited on 20/5/07 by MikeRJ]
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Doug68
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| posted on 20/5/07 at 04:49 AM |
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True.
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rusty nuts
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| posted on 20/5/07 at 07:50 AM |
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The Saab 900 was FWD doesn't look like a FWD hub assembly to me
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slopecombat
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| posted on 21/5/07 at 08:55 AM |
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SAAB 900 90's
cheers
Modesto
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Peteff
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| posted on 21/5/07 at 09:11 AM |
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I'd give it a try.
With the cv joint cut down it looks like a good alternative and it looks to have an angle built in the wrong way round.
 
Rescued attachment saab.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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rusty nuts
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| posted on 21/5/07 at 04:54 PM |
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From that angle it's plain that it's FWD
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t.j.
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| posted on 21/5/07 at 08:20 PM |
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hmmm,
Not sure about it.
- there is probable an angle (castor) static in the upright which has to be compensated.
- watch out where you're rod ends come.
They are tapered! Otherwise your rack comes high mounted.
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.jpg)
