Evrim
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| posted on 28/7/07 at 07:23 AM |
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Mk2 Quick Steering Rack
Hi,
Are there any disadvantages of using Mk2 2.9 Quick Steering Rack for Avon?What is the standard ratio of Escort Mk2 rack?
Evrim
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David Jenkins
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| posted on 28/7/07 at 07:47 AM |
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Standard Escort rack is around 3.5. The quickest rack commonly available is 2.4, but that can be too quick for some (but it's what I've
got!). If you've got reasonable castor (i.e. your self-centering is respectable) then 2.4 is fine, but it is a bit more tiring on long
journeys, and you may experience more 'kick-back' through the wheel on bumpy roads. If you don't have much self-centering then 2.4
can be 'interesting'... 
Some people on here have even lower ratios, but I don't think they are Escort racks.
2.9 is generally a very good 'in-between' ratio.
[Edited on 28/7/07 by David Jenkins]
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big_wasa
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| posted on 28/7/07 at 08:34 AM |
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Its what I am fitting and cheaper aswell 
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RazMan
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| posted on 28/7/07 at 09:58 AM |
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I had a 2.4 Escort rack and found it a tad too quick for my road car so I swapped it to a 2.9 which I am much happier with. There is much less effort
required to keep everything straight on motorways and bumpy B roads are more relaxed too.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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Ratters
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| posted on 28/7/07 at 10:55 AM |
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I have a 2.4 & I seem to get on fine with it. It does feel a bit twitchy sometimes on b-roads/lanes when a bit bumpy though you do get used to it.
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nitram38
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| posted on 28/7/07 at 11:31 AM |
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Hmmmmm..........kickback over bumps.
Sorry, has no bearing on rack ratio, more to do with bump steer.
Also "tiring" on long journeys has more to do with not enough castor.
My rack is only 1.25 turns lock to lock and I have zero bump steer.
Castor is 7 degrees.
It's not pleasent to put up with incorrect steering as it is you who gets fatigued.
Get your rack postion and castor sorted is my best advice and it won't matter what ratio you use.
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David Jenkins
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| posted on 28/7/07 at 12:08 PM |
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We've had this discussion before!
By 'tiring' I mean that you have to concentrate a bit more, as any minor hand movements will move you on the road much more. Not a
problem with correct castor, and you soon get the feel for it.
By 'kickback' I meant when a wheel hits something, even at slow speeds, for example the raised kerb between my drive and my
neighbour's when I reversed a few weeks back - the wheel jolted quite sharply. I didn't mean that the car swerves around on the road as
you go along, or that the wheel jerks in my hand!
I will agree that there would be a significant problem if there's insufficient castor, as I said originally. The driver would have to
continually adjust the steering to maintain a steady path. Unfortunately, too many kit 'sevens' follow the book measurements and
don't have enough...
I have plenty of castor - also around 7 degrees - as I modified my top wishbones. Generally the car is fine on the road.
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nitram38
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| posted on 28/7/07 at 12:19 PM |
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Yes with good castor the car is brilliant in a straight line, but also "helps" the steering unwind out of a bend so should cause less work
with the wheel.
With a 1.25 LTL I only have to think about changing lanes and it is done!
This makes double check every angle/view before I decide to change lanes and also I have to concentrate more.
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RazMan
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| posted on 28/7/07 at 02:10 PM |
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My car doesn't suffer with bump steer but the twitchyness around bumpy B roads is caused by the inertia of my arms reacting to the bumps - the
steering is solid and it's me that wobbles Also motorway miles just seem more relaxed as I do not have to keep such a firm grip on the
wheel.
Adjusting the column to bring the wheel closer helped a bit but there's only so much you can do. I just found that the 2.9 rack suited my
(wobbly) driving style 
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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