December 03, 2022, 04:40:52 PM
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Author Topic:  Polyurethane bushings interest  (Read 2913 times)

Offline timbo

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Polyurethane bushings interest
« on: March 27, 2022, 04:42:06 PM »
Well, since much of the "progress"...or lack there of...for poly bushings from either of the big vendors hasn't even gone past emails, I've begun the process of having custom poly bushings made up.  I'm currently in the design and pricing phase, but wanted to put this out there as it would be much more economical to get multiple sets made.  Plan is a harder (85+ durometer) bushing in black.


From a design standpoint, I'm trying to keep as many of them 1 piece vs a split design, especially at the knuckle.  Also need to see if it's feasible to use the later rear upper mount that is a spherical design on the earlier arms (Mine's '11 and seems like that's the year things changed).  Later using a design like the rear upper control arm mount at the knuckle that accepts the alignment bolt.


I'm experimenting with some universal swaybar bushings (30mm and 20mm, respectively) and rear upper spring pads, as that would be easiest to do.


Breakdown of 10 or 11 different bushings (20-22 total):


Front control arm: front and rear


Rear knuckle: drag link/trailing arm, lower control arm, shock mount


rear chassis: drag link/trailing arm, lower control arm, upper shock mount (might have found some universal), forward upper control arm, rear upper control arm (optional/use later spherical design), and alignment link.


I'm hoping the alignment link inner bushing didn't change on the Explorer since it uses a spherical design at the knuckle vs a ball joint style.  Upgrade my wife's car at the same time.


Once I get estimated cost I will post.  I'd like to do at least 10, but obviously more would reduce cost.
2011 SHO PP - Mild mods and 13+ Brakes
2018 Explorer Sport - Stock

Offline Macgyver

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Re: Polyurethane bushings interest
« Reply #1 on: March 29, 2022, 11:24:45 AM »
I always wondered what a soft riding car like the SHO would drive like if all the front and rear bushings were hard 80A type urethane. Would it be like the engine mounts and too stiff you get nasty vibrations ?

Offline bpd1151

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Re: Polyurethane bushings interest
« Reply #2 on: March 31, 2022, 07:26:05 AM »
* Interested *

Sent from my SM-N986U1 using Tapatalk


Offline GotGrip?

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Re: Polyurethane bushings interest
« Reply #3 on: March 31, 2022, 04:08:25 PM »
Yes please.


Upper trans mount would be huge also.
« Last Edit: March 31, 2022, 04:13:06 PM by GotGrip? »
2016 SHO Non-PP, GH/AJP E30 Tune,3Bar MAP, K&N Typoon, EPP Noisemaker Delete, H&R Springs, ZEDD SL5 19x9.5, PS Drilled/Slotted rotors, TreadStone TR8C FMIC, SSM Trans Mounts, TCE Custom Catted DPs, FMIC Sprayer, XDI35

Current Dyno: 421/503 (pre-dp/XDI)

Offline timbo

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Re: Polyurethane bushings interest
« Reply #4 on: April 07, 2022, 09:19:12 AM »
Quick update: every stock bushing manufacturer seems to be on backorder with a couple of the bushings (upper and lower rear control arm at the chassis primarily), so it's hard to get accurate measurements.  I'll be installing H&R springs that have been sitting in my garage for about 3 years now (adding kids and moving doesn't help)...120k miles, we'll see how everything is on the car (bearings, bushings, etc).


My initial intent is to buy universal poly bushings (1.5" id) from energy suspension and some Aluminum and steel pipe to make sleeves.  I have a lathe and the expertise to do this.  I purchased a rear knuckle to measure off of as well.  I really need to get tapatalk so it's easy to upload pictures as I do this.


The 3 companies I found that will make them said the initial cost will be pretty high due to setup and making molds.  The only bushing I see NEEDING to be made by someone else is the rear bushing on the front control arm.  I'm hoping there is a sleeve with a round OD on the stock bushing to be able to use or else it'll require some complex machining and either a custom broach or an interesting bushing design.  Why did Ford use a hex at the end of the arm?!?!  Frustrating.


Hoping to get some updates for everyone in the next couple of weeks on the progress of these things.
« Last Edit: April 07, 2022, 12:40:31 PM by timbo »
2011 SHO PP - Mild mods and 13+ Brakes
2018 Explorer Sport - Stock

Offline timbo

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Re: Polyurethane bushings interest
« Reply #5 on: April 09, 2022, 11:14:07 AM »
Yes please.


Upper trans mount would be huge also.


I'll have to take a look at that.  Might just be a window-weld kind of job initially.  I'd look at doing the engine mount as well, but the design looks weird.  Will have to actually have one in hand.  Unfortunately, both of those mounts are around $50 a piece. 
2011 SHO PP - Mild mods and 13+ Brakes
2018 Explorer Sport - Stock

Offline timbo

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Re: Polyurethane bushings interest
« Reply #6 on: April 28, 2022, 04:16:17 PM »
Quick update:


Some bushings are on backorder.  I did some rough measurements and found some universal solutions.  Unfortunately, the cost is pretty high due to my thoughts on optimal bushing designs, as the straight, 2-axis motion allowed with universal bushings isn't very appropriate for a few locations.


I have new control arms in the front currently and will send out an old bushing to see what can be done regarding the hex portion of the front control arm.  I know some BMWs have been using this design for a while and have some poly options, so it's doable.


Here's a breakdown of my thoughts:
Front F: steel sleeve with 1.5" universal bushing
Front R: custom


Rear Knuckle:
Lower Arm: Aluminum sleeve 1.5" OD universal bushing
Drag link: spherical joint
Shock: poly bushing (testing one that measures as if it will work)
Upper arm: stock is a spherical joint


Rear Chassis:
Upper Fwd: Steel sleeve 1.75" OD universal bushing
Upper rear: later 11 and newer joint is a spherical joint
Lower arm, drag link, and lateral link (threaded one for toe alignment): Johnny joints to allow deflection and minimize stress on outer joint.


Upper shock bushings and upper spring isolators are universal from Energy suspension.  Got a pair of each installed on my car right now.


The cost of just the joints as of right now (barring any sales or discounts I will try and get) is just under $580 NOT including the custom one for the rear position on the front control arm.  This also doesn't account for machine work to both the tubing and the bushings (shock mount bushing probably needs a little turn on the lathe).


I bought a pair of good rear knuckles to clean up and assemble to minimize down time.  There's not easy way to press some of the bushings out, unfortunately, so it'll probably take some heat.


It might be possible to just do the rear uprights and the front control arm positions initially to tighten up the suspension.  Replace the inner with new rubber to get a good mix.  Lots of ways to do this, honestly.  I have no idea what the longevity of these bushings would be in this application since most are slightly smaller than stock.


I dislike the stock rubber because everything must be tightened after the vehicle is at ride height. 


Now, for a company to make a proper bushing in almost every location, it would have to be similar to the solid axle rear bushings that are in a metal sleeve.  The lower control arm at the chassis, upper control arm, shock at the knuckle, and drag link at the chassis could easily be just a bare poly bushing.


With that all said, I'll be out of town until July, so I won't make any real headway on the knuckle side of things.  I just got done getting everything set with the lowering springs and new shocks, so hopefully I can forego an alignment until after I get the rest situated.


Again, i'll keep everyone posted on my progress when I finally get things moving forward beyond computer spreadsheet and measurements.
2011 SHO PP - Mild mods and 13+ Brakes
2018 Explorer Sport - Stock

Offline SHOdded

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Re: Polyurethane bushings interest
« Reply #7 on: May 06, 2022, 04:33:15 AM »
best of luck!
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

Offline P71Nero

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Re: Polyurethane bushings interest
« Reply #8 on: June 11, 2022, 10:25:09 PM »
I'm very interested in this, would most likely buy a full set
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Offline timbo

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Re: Polyurethane bushings interest
« Reply #9 on: August 07, 2022, 11:03:32 AM »
Well, as life happens, so do delays.  The week after I returned from out of town my 2yo broke his leg and any time I have home is spent with him.  I did purchase another set of uprights so I can minimize any down time my car has.  They still need to get disassembled and cleaned up before I move forward.


I did make a couple changes to which bushings to use.  I decided to allow some articulation on the lower/inner bushing by using the DayStar spherical type.  The housing will need a little turn on the lathe, but it should minimize any binding in the suspension.  Also, the lateral link (toe adjustment) will remain stock, but using another DayStar bushing.  The housing is a little smaller than the hole, but a little welding will fix that.


I did finally get tapatalk, so I'll upload pictures as I get things done.  The shock bushings did require a little bit of a turn on the lathe, but are done.
2011 SHO PP - Mild mods and 13+ Brakes
2018 Explorer Sport - Stock

 


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