Alternative Steering Column?

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Alternative Steering Column?

Post by willholderogri » Wed Jan 23, 2019 6:25 pm

My setup uses the two original universal joints With a short piece of the original columb welded to the telescopic MGF columb I never bolted it to the bulkhead as I want it to be easy to remove if I have to do any repairs . It's been on donkey s years now without problems .so removal is not really a concern any more .


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Alternative Steering Column?

Post by spegru » Mon Jan 28, 2019 12:23 pm

I'm a bit slow to notice you answer again...

So could I ask how the motor end of the MGF column is supported in your installation?
I found a pic of the MGF column and there appears to be a large bracket - so is that fixed to the bulkhead by any chance?



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Alternative Steering Column?

Post by spegru » Mon Jan 28, 2019 12:28 pm

I did post a picture but that seems not to have appeared. plenty of such pics on ebay though



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Alternative Steering Column?

Post by peter freeman » Mon Jan 28, 2019 1:21 pm

This is how we have fitted MGF EPAS to two 5As - https://www.scimitarweb.co.uk/~nenoggins/EPAS.htm - would you need power steering as most 6As already have power steering - if it just the indicator stalk I believe Graham Conway the 6 registrar has fitted something else.



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Alternative Steering Column?

Post by spegru » Mon Jan 28, 2019 5:49 pm

Thanks for that. It's possible I'd seen it before somewhere but link lost.....
My 6a did not have PAS. Although I now have fitted a PAS rack I have not yet plumbed it in but am quite honestly expecting it to leak everywhere if/when I do.
However this was only part of the reasoning. The other part is the worn/floppy column switches that a new column would presumably enable a better replacement for.
If/when my power rack leaks I'll strongly consider treating it as a manual rack (to get the high ratio), replacing the gaiters and electrifying the column instead of getting it rebuilt - complete with better switch gear



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Alternative Steering Column?

Post by Roger Pennington » Mon Jan 28, 2019 6:19 pm

spegru wrote:
Mon Jan 28, 2019 5:49 pm
treating it as a manual rack (to get the high ratio)
Pardon? the manual rack is lower ratio


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Alternative Steering Column?

Post by scimjim » Mon Jan 28, 2019 6:45 pm

Roger Pennington wrote:
Mon Jan 28, 2019 6:19 pm
spegru wrote:
Mon Jan 28, 2019 5:49 pm
treating it as a manual rack (to get the high ratio)
Pardon? the manual rack is lower ratio
But a PAS rack with no fluid in, is a high ratio manual rack :D


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Alternative Steering Column?

Post by spegru » Mon Jan 28, 2019 6:47 pm

I see what you mean but it does depends which way you look at it. :)
I was thinking Higher=Quicker and actually the ratio as seen from the rack end really is a higher number - ie 1/2.5 is a higher number than 1/4.7



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Post by Roger Pennington » Mon Jan 28, 2019 9:18 pm

I think you've mixed it up - the power rack is a higher ratio, quicker, rack. The manual rack is a lower ratio, slower rack.
The PAS gives 2.5 turns lock to lock, the manual gives 4.3 - that's a huge difference.
Admittedly the PAS cars have a slightly larger turning circle, but at 41.5 ft on the PAS and 38.5 on the manual, but that's only about 6% (approx)


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Post by Roger Pennington » Mon Jan 28, 2019 9:23 pm

Ah - just realised you said "treat it as" - I read it as "treat it to" that makes a world of difference :oops: :)

Yes that would work, as long as the PAS rack is happy to be used that way? Mark would probably know?


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Post by spegru » Mon Jan 28, 2019 11:23 pm

Roger - yes that's what I meant.
I didn't know the turning circle was different between PAS and manual - and it would be great to decrease that!
That also means that the PAS rack is not as 'Quick' as I thought. I wonder how many turns it would be if it could get the same steering angle as the manual one? There's probably a way to calculate turning circle from steering angle and wheelbase length - and vice versa .... hmmm

I would love to be able to get a quick ratio manual rack really - but so far no sign of a suitable item
I also wondered about replacement, shorter steering arms, since they bolt on, as that could have a similar effect (up to a point) - although it might also mess with steering geometry issues such as Ackerman and bump steer



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Post by Roger Pennington » Mon Jan 28, 2019 11:33 pm

I don't think the difference in turning circle really amounts to much - it's the difference between a huge turning circle, and a slight more huge one - as I said, only about 6%, which is fairly trivial.


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Alternative Steering Column?

Post by scimjim » Mon Jan 28, 2019 11:36 pm

the competition guys have made quick manual racks - but they're bespoke and bespoke prices :D

EPAS is definitely the way to go on a road car IMO - I'm going to try and fit it to de-dieseled diesel and possibly Sarah's coupe (when I get round to it).

shorter arms on the existing rack won't change anything (unless they're that short you can't get the toe to parallel :D )


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Alternative Steering Column?

Post by efi_sprintgte » Tue Jan 29, 2019 8:43 am

Our ex Jerry Ree sprint car had a DIY quick rack using a PAS rack with no pump. It was too heavy for road use imho.


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Post by Roger Pennington » Tue Jan 29, 2019 11:07 am

You're right James, a long time ago, I had a PAS pipe burst while on a trip to Cheshire (fortunately not far from Don Pither's place). So I drove the car there, then bought a pipe (which he had in stock) and changed it before continuing. While it wasn't working, the steering was not too bad with a bit of speed, but very heavy at slow speed. It certainly wouldn't be usable in normal use. But then that's where the EPAS would come in of course.


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