Hi there,

Got my test next wednesday and am just sorting out my steering wheel so that its legal.

My steering column has a telescopic collapsing mechanism but my steering wheel has no collapsable boss. Do you just need one or the other? Or both?

Cheers,

Matt

It would appear you need both.......

Either or a change of direction in the colomn, such as two UJ's

quote:

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Originally posted by The Simmonds
Hi there,

Got my test next wednesday and am just sorting out my steering wheel so that its legal.

My steering column has a telescopic collapsing mechanism but my steering wheel has no collapsable boss. Do you just need one or the other? Or both?

Cheers,

Matt

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quote:

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Originally posted by iiyama
It would appear you need both.......

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Don't NEED a collapsible boss.
Cant you run the doner steering wheel, save a lot of hassle?

thanks everyone.

I dont have the donor steering wheel. No one has an old sierra steering wheel knocking about that they want to get rid of do they?!

Thanks

Matt

I have one, must be someone nearer thjough?

where abouts are u based? Burr Beige, Leceistershire? If I search for that on google maps it comes up with Peter Smith sports cars in Derbyshire?! I know where that is if thats right! thanks for your offer

Try Burbage, Leicestershire ( Hinckley)

You need both. A Sierra wheel is deemed to be collapsible but if you're using a Mountney or such like you need a callapsible boss despite collapsible columns and any number of U/Js.
I failed on this and had to fit a different boss

Right, simple!

You don't NEED a collapsable boss.

You NEED: EITHER a collapsable column OR a column that will collapse away from the driver in a front impact, i.e. as Nitram says, one with two uj's and suitable angles between them.

YOU ALSO NEED: a steering wheel that complies with the radius requirements in the SVA manual. "Most" Mountney wheels DO NOT COMPLY with the radius requirements, and will therefore fail, not because they are not collapsable, but because they don't have suitable radii.

I was under the impression, as per the "one rule for caterham" thread the other day, that all wheels must be type approved (so how they deform in a driver into the wheel scenario has been tested) OR mounted on a collapsable boss so the wheel moves away from the driver if there body was to slam into it?

I know radius is a concern, but I thought the main reason for fitting a donor (or type approved) wheel was to satisfy this criteria?


found the thread - interesting stuff!

http://www.locostbuilders.co.uk/viewthread.php?tid=109461

quote:

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Originally posted by NS Dev
Right, simple!

You don't NEED a collapsable boss.

You NEED: EITHER a collapsable column OR a column that will collapse away from the driver in a front impact, i.e. as Nitram says, one with two uj's and suitable angles between them.

YOU ALSO NEED: a steering wheel that complies with the radius requirements in the SVA manual. "Most" Mountney wheels DO NOT COMPLY with the radius requirements, and will therefore fail, not because they are not collapsable, but because they don't have suitable radii.

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This is exactly the problem that is being talked about on another thread!

Southampton SVA centre require a collapsible boss and steering column. People have failed there recently because they only had one of the two fitted.

I believe if you have a Sierra wheel fitted this counts as a collapsible boss.

This might explain my experience.

I presented car at first test with Sierra collapsible colum and Sierra steering wheel. That combination was fine - except i failed cos of wheel height.

Solution was drop the column a little and fit smaller aftermarket wheel (obviously observing slaots and radii rules). To get the smaller aftermarket wheel to pass i also had to fit a collapsible boss as well.

So - OE type approved wheel is OK with OE column.
Aftermarket wheel needs collapsible boss no matter what column arrangement you have.

Or at least thats the rule for passing at my SVA centre. Might seem belt and braces to some people (or should we say outside of the grey zone?) but its certainly on the safe side and we cant argue with that can we.



Golden rule - if in any doubt - ring your local SVA man and ask their advice. As long as you dont pester them im sure they will be only too pleasd to talk and advise, my man certainly was.

[Edited on 27/3/09 by DarrenW]

so my steering with 2 uj's and a mountney wheel will pass if i can radius the wheel .....

i'm thinking stick on u trim here i come.



This car is actually going to be ready for SVA in summer !!!!! Woohoooo..

Hi, managed to borrow one from 'cd.thompson' so Im sorted now.

Many thanks Craig and thanks to everyone else for your help.

Matt

Glad you'e got it sorted.
It seems this is one of the areas that regularly highlights the anomalies between test centres.
Even though I have a collapsble Sierra column AND a dog-leg in the lower section, Exeter still required either a collapsable boss or original Sierra Steering wheel to be fitted at my recent SVA.
Examiner's explanation being that the Sierra wheel is designed to deform in the event of driver making contact with it in an accident.
A collapsable boss mimics this.
In light of this, I would suggest playing safe and fitting the original wheel or a collapsable boss irrespective of what type of column you have.

My complication with this is that, as a locoster with caterham rack+column+wheel my original wheel is a Mountney but my car is not a Caterham so does not pass due to 'low volume' rules. Just have to get another SVA approved wheel I guess.