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Old 06-05-2021, 09:34 PM   #1
DrZiplok
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Default [240] front lower control arm, rear bushing - any solid options?

We're killing these in a weekend of racing - just tried the Powerflex blacks, and the same basic result.

I think it's a mixture of heat (always the RHS that fails) and abuse, but we upped our heatshield game this time around and the bushing still came apart, so...

I've seen STS have solid Delrin parts. Short of the Sellholm arms, does anyone else do a spherical rear bushing?

TIA.
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Old 06-06-2021, 10:54 AM   #2
JohnLane
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There is a Swedish outfit offering a copy of the Sellholm arms with the weld-in rear bushing.
Perhaps someone recalls a name for them?
Otherwise the Sellholm product is the Cat’s pajamas. But you’ll pay for it.
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Old 06-06-2021, 12:22 PM   #3
blkaplan
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We used to offer some kick ass 4130 welded control arms that used rod ends.


For our current work flow and equipment we decided to stop offering them as they are not scalable and take too much labor to make. We will be offering a machined from solid setup sometime in the near future that utilizes rod ends.

Anyone whos run these arms can attest to how huge the upgrade is.
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Old 06-06-2021, 02:38 PM   #4
DrZiplok
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Quote:
Originally Posted by blkaplan View Post
We will be offering a machined from solid setup sometime in the near future that utilizes rod ends.

Anyone whos run these arms can attest to how huge the upgrade is.
They look kinda fragile. Would you like someone to beat on your prototypes a bit? 8)
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Old 06-06-2021, 04:52 PM   #5
culberro
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We found that stock rubber replacement bushings lasted longer than poly when rally racing.
More compliance, but less breakage and shock loading.
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Old 06-06-2021, 07:26 PM   #6
blkaplan
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Quote:
Originally Posted by DrZiplok View Post
They look kinda fragile. Would you like someone to beat on your prototypes a bit? 8)
They were well tested and held up great. Thats not the reason we stopped offering them.
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Old 06-08-2021, 01:14 AM   #7
dkrause
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Quote:
Originally Posted by DrZiplok View Post
We're killing these in a weekend of racing - just tried the Powerflex blacks, and the same basic result.

I think it's a mixture of heat (always the RHS that fails) and abuse, but we upped our heatshield game this time around and the bushing still came apart, so...

I've seen STS have solid Delrin parts. Short of the Sellholm arms, does anyone else do a spherical rear bushing?

TIA.
We made our own Delrin bushings they have raced over 50 endurance races no issues, simple and cheap to build.
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Old 06-08-2021, 02:50 PM   #8
JimWilling
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https://www.motorsportshop.nu/epages...roducts/100042

Same product

http://www.retroturbo.com/?product=v...t-wishbone-set

This has been the arm in the back of my mind as an eventual upgrade. I haven't been able to find much discussion of its use around these forums, but my understanding of the rear arm location is that it bolts into the bushing cup, although I'm not sure there's not something missing there.

We've got a set of STS delrin units that'll go into the new shell when we get there. We're going to have heat generation issues on both sides of our engine bay so... we'll let you know. Provided y'all don't beat us out to the track.

Do you guys have any pictures of the exhaust routing as it passes the bushing?

Last edited by JimWilling; 06-08-2021 at 07:04 PM.. Reason: additional question
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Old 06-08-2021, 02:51 PM   #9
JimWilling
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Quote:
Originally Posted by JohnLane View Post
There is a Swedish outfit offering a copy of the Sellholm arms with the weld-in rear bushing.
Perhaps someone recalls a name for them?
Otherwise the Sellholm product is the Cat’s pajamas. But you’ll pay for it.
Are these the ones you're referring to?

http://www.retroturbo.com/?product=v...t-wishbone-set
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