Question on designing "hybrid" delrin suspension bushings - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 01-30-2013, 06:51 AM   #1
Elite Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default Question on designing "hybrid" delrin suspension bushings

I am planning on making a set of delrin bushings for my '98 NB.

However, I am concerned about the binding issue brought forward by those in the know, concerning the adjustment points in the control arms.

One solution I can think of is designing a hybrid bushing with a steel sleeve, delrin center section and a rubber outer layer. The rubber would be 2 to 3 mm thick, to allow for enough lateral movement to facilitate toe adjustment. This is for the rear suspension.

The rubber section will be bonded to the delrin, of course.

What do you guys think?
Godless Commie is offline   Reply With Quote
Old 01-30-2013, 07:12 AM   #2
Senior Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Sweden
Posts: 1,391
Total Cats: 58
Default

I have another hybrid thought for a related problem.
Dual steel sleeves (the outer one being a mm shorter), and needle bearings between them and a "standard" PU bushing surrounding it all.
The goal is to reduce the torsional binding (poorly maintained PU can stick a bit).
Bronze might be a better choice (sales pitch).

But this is just a thought and will never happen, I promise.

Regarding rear toe, if there is advantage of have a bushing of one hardness or two different (part delrin and part rubber) I don't know. The smaller rubber part would have to take all the angle deflection since the Delrin would not flex at all (if there is something softer that can flex).
But I'm just bored at work, so there must be better post coming, soon.
NiklasFalk is offline   Reply With Quote
Old 01-30-2013, 01:11 PM   #3
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

I searched for binding delring control arm bushings and only found one comment below and in the same thread others not having issues. I've installed and run delrin control arm bushings in four Miata race cars at this point and all of them had full range of motion without binding when complete. I could bring the assembly to full compression (no shock/spring etc.) and when I let go it would fall to full droop. What am I missing?

Quote:
Originally Posted by TNTUBA View Post
You don't want Delrin in the lower arms or the upper rear knuckle.
m2cupcar is offline   Reply With Quote
Old 01-30-2013, 01:15 PM   #4
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: NH
Posts: 9,093
Total Cats: 90
Default

I think its more a concern of being able to adjust toe/caster. IMO it shouldnt be a big deal there, on the formula car we run the same style cam bolt adjusters and our delrin bushings have like a 1/8th wall thickness and we can get adjustments there without binding. We didn't design the car to have those adjustments at the inner control arm pickups because we were afraid of the same binding issue.

The rampage miata guys have the same concern and have delrin everywhere except in those spots tintuba mentioned where they have poly. They claim that IL motorsports told them to do it that way.
Leafy is offline   Reply With Quote
Old 01-30-2013, 01:18 PM   #5
Destroyer of Inconel
iTrader: (37)
 
EO2K's Avatar
 
Join Date: Apr 2010
Location: In ur driveway, abusin' ur WPA
Posts: 9,642
Total Cats: 954
Default

We used to make solid delrin bushings all the time for the racecar guys and for industrial applications when I worked at the machine shop. Pay attention to your tolerances so you don't bind, and make sure to set them up for grease channels from the zerk fittings and win at bushings.
EO2K is offline   Reply With Quote
Old 01-31-2013, 04:12 AM   #6
Elite Member
Thread Starter
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Quote:
Originally Posted by m2cupcar View Post
I searched for binding delring control arm bushings and only found one comment below and in the same thread others not having issues. I've installed and run delrin control arm bushings in four Miata race cars at this point and all of them had full range of motion without binding when complete. I could bring the assembly to full compression (no shock/spring etc.) and when I let go it would fall to full droop. What am I missing?
This is good to know..
Did you have rear toe set when you were doing the full droop test?
Godless Commie is offline   Reply With Quote
Old 02-01-2013, 02:17 PM   #7
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,244
Total Cats: 291
Default

Yes and no. All the bolts were torqued down at the marked settings from the OE bushings for the droop/compression test. Then the it was realigned after suspension was fully assembled. I can see how some opposing camber bolts could cause bind for radical toe, or to compensate for mechanical differences. I guess I was fortunate to have all things (fairly) even and straight, and in the interest of neutral toe.
m2cupcar is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Hey everyone another n00b here Big_gumby Meet and Greet 80 10-05-2015 05:06 PM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:37 AM.