Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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rficalora
Rob Ficalora
Cypress, TX
(2305 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Looking for a catalog of poly bushings
Posted by: rficalora
Date: May 08, 2016 11:31PM

One of the bushings on my IRS is wearing already (14k miles). The steel sleeve is getting ovaled on the inside.

The current bushings are pete & jakes. Petty sure they're rubber. Thinking I'll try polyurethane or delrin but haven't found them in the size I need. Anyone know of an online catalog with dimensions?


mgb260
Jim Nichols
Sequim,WA
(1728 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Looking for a catalog of poly bushings
Posted by: mgb260
Date: May 09, 2016 06:58AM

Rob, Try Energy Suspension.

[energysuspension.com]



Edited 1 time(s). Last edit at 05/09/2016 06:59AM by mgb260.


rficalora
Rob Ficalora
Cypress, TX
(2305 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: rficalora
Date: May 09, 2016 09:14AM

Thanks Jim. I found a table on their site with all the dimensions and part numbers - exactly what I was after!

I also found that I can get Delrin bushings made to spec for about $6 each. I'm considering that - I'm assuming the bushings are flexing causing the bolt to run on the sleeve causing the wear. Felton should eliminate the flex. But, cost will be 2-3x once I get the bushes and sleeves.

Speaking of sleeves, know of a source to get hardened ones?


DiDueColpi
Fred Key
West coast - Canada
(1191 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: DiDueColpi
Date: May 09, 2016 12:10PM

Sounds like your sleeves are moving on the bolt Rob.
They shouldn't.
When done up, the sleeve should be clamped tightly with no opportunity for movement.
Hardened sleeves are available but not needed. You will be fixing a symptom and not the real problem.

Cheers
Fred


rficalora
Rob Ficalora
Cypress, TX
(2305 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: rficalora
Date: May 09, 2016 01:59PM

OK, that makes sense Fred. This pic shows the one that is wearing and there is a slight gap between the bushing and the upright - not enough for a grade 8 washer (that's what I had on hand to try). Short of cutting the LCA apart and rewelding it, can I shim it? If so, mild steel or something else to make the shim?

2008-05-15 IRS Fitting 007.jpg


rficalora
Rob Ficalora
Cypress, TX
(2305 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: rficalora
Date: May 09, 2016 02:00PM

OK, that makes sense Fred. This pic shows the one that is wearing and there is a slight gap between the bushing and the upright - not enough for a grade 8 washer (that's what I had on hand to try). Short of cutting the LCA apart and rewelding it, can I shim it? If so, mild steel or something else to make the shim?

2008-05-15 IRS Fitting 007.jpg


kerbau53
Geoff Morton
Naples, FL
(106 posts)

Registered:
08/09/2010 10:27PM

Main British Car:
78 MGB Ford 5L

Re: Looking for a catalog of poly bushings
Posted by: kerbau53
Date: May 09, 2016 02:24PM

Rob,

Against everyone's advice I used Delrin bushings on the stock front end of a GT years ago. I loved the feel but they were pushing the harsh side of ride quality. Advantage is being able to get them cut to fit.



DiDueColpi
Fred Key
West coast - Canada
(1191 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
What if the Hokey Pokey really is what it's all about?

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: DiDueColpi
Date: May 09, 2016 10:32PM

Shim away Rob.
Or better, add the grade 8 washer and trim the sleeves so that you have a very slight compression of the bushing when the bolt is drawn up tight.
Is this a test fit shot? As several things look loose.
You might want to shorten the coil over bolt.
What you're shooting for is a thread protrusion that is 1/2 the nut width. It's a little picky but.
It meets all engineering obligations and has a symmetry that is pleasing to the eye.

Cheers
Fred


rficalora
Rob Ficalora
Cypress, TX
(2305 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Looking for a catalog of poly bushings
Posted by: rficalora
Date: May 09, 2016 11:04PM

Thanks Fred. Yes, that was an early test fit photo. I wasn't happy with the IRS when I first got it so have made several changes since. The shocks, as one example, no longer lay over at an angle like that. They are way more effective now. Bolts are also sized better too :).


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