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SIERRA Steering Rack
Cobra289 - 25/6/08 at 10:58 AM

Why is the sierra steering rack not a frequent used rack?

I have a dimension between the joints of 750.81 mm is this right?

Thanks for your help.

Regards,
Cobra289

Hellfire - 25/6/08 at 11:09 AM

The Sierra rack IS a commonly used rack. Certainly most MK Indys (amongst others) use this rack.

With regards to the dimensions between joints, what vehicle are you fitting it to? Obviously this will determine your rack length in order to negate bump steer.

Phil

Mr Whippy - 25/6/08 at 11:11 AM

IIRC it is used by at least MK, as a shortened version. The body is made of aluminium unlike the escort/Cortina type which is steel so can be difficult to weld. It is easier to fit though due to having only 2 bolts rather than other having 4 plus clamps and rubber mounts. Ideally the joints you speak of should be inline with the inner upper and lower wishbone bolts when the wheels are pointing dead ahead. If done that way (you can raise and lower the racks mounting position to achieve this) you will practically eliminate bump steer.




[Edited on 25/6/08 by Mr Whippy]

Cobra289 - 25/6/08 at 11:18 AM

quote:
Originally posted by Hellfire
The Sierra rack IS a commonly used rack. Certainly most MK Indys (amongst others) use this rack.

With regards to the dimensions between joints, what vehicle are you fitting it to? Obviously this will determine your rack length in order to negate bump steer.

Phil

Thanks.
I am designing a Seven that use the dimensions of the book with the 4" wider option of McSorley.
Solve the bump steer will not be a problem, provide that I have the room to accommodate the lever at the upright.
The result can be a problem for the Ackerman but we can check and see if we are in shape.

Do you know if the MK use a short version or just the standard one?

Thanks,
Cobra289

Cobra289 - 25/6/08 at 11:21 AM

quote:
Originally posted by Mr Whippy
IIRC it is used by at least MK, as a shortened version. The body is made of aluminium unlike the escort/Cortina type which is steel so can be difficult to weld. It is easier to fit though due to having only 2 bolts rather than other having 4 plus clamps and rubber mounts. Ideally the joints you speak of should be inline with the inner upper and lower wishbone bolts when the wheels are pointing dead ahead. If done that way (you can raise and lower the racks mounting position to achieve this) you will practically eliminate bump steer.
[Edited on 25/6/08 by Mr Whippy]


Thanks!
The sierra rack has a very practical fixing points [as you mention] it would be easy to change the height [shimming] to get the right bump steer.
Regards,
Cobra289

Mr Whippy - 25/6/08 at 11:21 AM

Mk use a shortened one, they will happily sell you it.

[Edited on 25/6/08 by Mr Whippy]

Cobra289 - 25/6/08 at 11:26 AM

quote:
Originally posted by Mr Whippy
Mk use a shortened one, they will happily sell you it.

[Edited on 25/6/08 by Mr Whippy]

Thanks!
I hope that some one can tell the distance between the pivot [ball-joints] points.
Regards,
Cobra289

Hellfire - 25/6/08 at 11:51 AM

Just to clarify, the rack MK provide is a standard Sierra rack which is cut down to suit their chassis. If you think it may be suitable but can't get the dimensions before, I can measure the length for you this evening?

Phil

Cobra289 - 25/6/08 at 01:02 PM

quote:
Originally posted by Hellfire
Just to clarify, the rack MK provide is a standard Sierra rack which is cut down to suit their chassis. If you think it may be suitable but can't get the dimensions before, I can measure the length for you this evening?
Phil

That would be very kind Phil. I hope that's not to much trouble.
Thanks in advance,
Regards,
Cobra289

tks - 25/6/08 at 04:37 PM

Wait...

Isn't the rack mostly used the ESCORT MKII rack???

Which accepts the sierra downlink....

Cobra289 - 25/6/08 at 04:47 PM

quote:
Originally posted by tks
Wait...
Isn't the rack mostly used the ESCORT MKII rack???
Which accepts the sierra downlink....

Hi TKS,
In principle every rack can be used as long it fits the design.
The Book design is based on the Escort rack but as you can read here, the MK Indy use the Sierra cut to suit.

Regards,
Cobra289

[Edited on 25/6/08 by Cobra289]

Hellfire - 26/6/08 at 12:09 PM

Sorry, I was busy last night and didn't manage to measure the rack. I'll do it this evening and drop you a U2U.

Phil

Cobra289 - 26/6/08 at 01:45 PM

quote:
Originally posted by Hellfire
Sorry, I was busy last night and didn't manage to measure the rack. I'll do it this evening and drop you a U2U.

Phil

Thanks don't worry, take the time that is needed.
Thanks again.
Cobra289

Hellfire - 26/6/08 at 05:37 PM

Cobra289, you have U2U.

Phil