Jump to content
Frosty

Guide to wishbone bushes

Recommended Posts

Dave Eastwood (Gadgetman) - Club Secretary

Wow, seven years! That flew by.

 

Share this post


Link to post
Share on other sites
Andrzej

@Dave Eastwood (Gadgetman) - Club Secretary   - the same (metalastic bush in outer rear lower wishbone eyelet) is in the case of Westfield with Sierra upright ? not only with Mazda ? I think so.. Did not know that, thanks for pointing this out! 

With metalastic bush one need to tighten the nut on that bush with car sitting on floor, weighted with driver , right ? 

I have now nylon (two parts - hat type) bushes in that places, not sure if should I change it to metalastic now, or wait until there will be some play in the nylon bushes... For sure a place to check more frequently. 
 

  • Like 1

Share this post


Link to post
Share on other sites
Dave Eastwood (Gadgetman) - Club Secretary

Replace now.

 

Given that the car is tracked a lot, failure at speed on track doesn’t really bear thinking about...

Share this post


Link to post
Share on other sites
Andrzej

Oh, winter seems to short for all the services planned for Westfield :) 

 

Two things regardig  bushes I am thinking of :

1. The original (Westfield) ones are all 7/16" crush tube internal diameter (for suspension, for differential is 12mm as I read) . 7/16" It is approx 11,1mm. I wonder if it will be ok to use a bush with internal diameter tube  12mm. As the bolt is not the pivot axle , (quote the first post in this FAQ topic  "When force is placed on the wishbone and it is required to pivot up and down, the rubber between the sleeves is what permits this movement" . It seems to be ok then, but not sure If anyone has used 12mm crush tube. There might be smaller amount of rubber beetwen crush tube and sidewall ob. bush, but maybe it is not so important, just wonder.

I have found that Poweflex has 12mm internal diameter

http://www.powerflex.co.uk/i/product_images/99-116 WEB.pdf

https://www.powerflex.co.uk/product-details/Universal+Kit+Car+Bush+For+Westfield/2103.html

And Westfield Parts sell Powerflex, so semms to be ok to use 12mm.

 

2. The crush tube sidewall thickness. It looks like the only part of bushes that is connecting wishbones to chassis (its brackets) are sidewalls of tubes tightened to bracket . Small area rather. I saw on some of my Westfield brackets impressions caused by those tubes. I think the more sidewall thicknes would be the better.

Has anyone compared diferent sourced bushes (Rallydesign, Westfield = Powerflex, Plays Kool ) regarding thicknes of wall of crush tubes in those  ? It seems from the foto , that Wsestfield/Powerflex has the thickest sidewall , but it is only picture, maybe someone had all those in hands and can tell if there is a difference ?

I had in hands RallyDesign yellow ones and that what I took from my car - black hat type, propably former Westfield Nylon ora PlaysKool. Crushtubes in both are similar. Did not had Powerflex :

https://parts.westfield-sportscars.co.uk/index.php?route=product/product&product_id=841&search=bush&description=true

On the picture its crush tube is really thick . This are most expensive ones, but maybe worth it assuming it can save the chassis brackets ?

 

I am in hurry because of possibility to get 20% off in Westfield Parst on Black Friday, I wonder if not to order a set for complete car and change all bushes during winter , set the geometry and not going back to this subcjest any more (well … for a some longer period of time :) ) . 

Not sure if assembling of this type (one part of nylon tube) is so easy as two-parts type (hat type) that PlasKool and RD sells.

 

 

 

Share this post


Link to post
Share on other sites
Dave Eastwood (Gadgetman) - Club Secretary
1 hour ago, Andrzej said:

The original (Westfield) ones are all 7/16" crush tube internal diameter (for suspension, for differential is 12mm as I read) . 7/16" It is approx 11,1mm.

 

For reference, the differential bushes are exactly the same bushes as used in the suspension, BUT, they are reamed out to 12mm at the factory.

 

The potential issue if the bushes are too "slack" on the bolts would be repeatability in aligning the suspension up in the correct places, as there's the possibility for tiny misalignments to start building up. Plus I always have a worry in these circumstances, that in theory, the crush tube might, (unlikely I know), move ever so slightly over time, in the mount.

 

Personally, I'd just rather have it right, where possible, on suspension components.

Share this post


Link to post
Share on other sites
Andrzej

Yes, me to - I also want to make all as right as possible, so minimize service-time for the car in driving season. Want to make what I can now, in winter when car sits in the garage , not driving. And make it right way.

So all that questions and thougts. And thank You again for Your patience with all explanations to a Westfield newbie ! :)

But - Powerflex Bushes has as in data above - 12mm internal diameter. And Westfield sells Powerflex.

( from Powerflex website : Bush Dimensions. Bush Diameter = 24mm, Length = 35mm. Sleeve Length = 39mm, Bolt Hole = 12mm. )

Maybe Westfield Parts ordered from Powerflex especialy made for them 7/16 tubes, different from those that Powerflex sells on their shop. In that case it is better because it can has thicker internal tube sidewall.

 

Differential bushes… that I think is another subcjet...

I have just taken differentia out from the car, to get it for inspection, sealing etc, to check driveshafts, instal trigger wheels on driveshafts for TC etc) .

And I looked at diff bushes. I wonder how on earth one can replace metalastic ones if there is a need for replacment in there ? I mean an acces is rather restricted :-/

I rememeber how hard it was to take metalastic bush from wisbone or rear diff suport arm. But this arm I could put on table, turn on which way I wanted  etc - easy access for different methods of taking bush out. Ended with hacksaw.

But in diff - all in raher small area fixed to chassis ? .

I have foud that one of my existing bushes in diff mounting can be easily pressed out by hand (lower right, left sits still) . Upper ones are changed by previous owner to nylon - hard one. If I press in somehow on chasis metalastic ones (again - that access!) instead of nylon , then how I take it out when there is a need in future. that worries me.

So - would be bad idea to left those nylons as they are? or there is some reason that one need to put only metalastic in those places ?

The diff bushes I think has hard work to do - heat, movements (a lot of focre going through diff, and it weight around 30 kg (!) , so on every bump it jumps ) , some oil if not freshly sealed … Bushes might need to be replaced frequently - easier with nylon than metalastic (assuming that I will succeed wit placing them in).

Share this post


Link to post
Share on other sites
Andrzej

A quick update - differences in crush tube sidewall thickness: matalastic, hat type nylon (rallydesign yelllow, Black I AM not sure which one - taken  from wishbone from my car propably old Westfield type or maybe Black rallydesign? And the thickest - Powerflex for Westfield from Westfield parts shop. I think this is important because this is the only place where the tube is connected to wishbone bracket. IT should be as thick as possibile to keep brackets on good shape and keep tube not rotating. 

IMG_20191219_211715749.jpg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...

Important Information

Please review our Terms of Use, Guidelines and Privacy Policy. We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.