Rear Subframe Bushing Hotness
Rear Subframe Bushing Hotness
This season we downgraded our autocross car from Street Modified to Street Prepared, and because of the stricter modification rules, some new parts have been appearing around the mc²racing shop. One new part we had to produce was a rear subframe bushing. In Street Modified we could weld our beams solid, but in Street Prepared the bushings cannot have more metal than stock. So, I basically just picked an uber-high-durometer non-metallic material that is readily available, tough, resistant to the elements, and reasonably priced. That material would be Delrin, and these are the resulting solid rear subframe bushings:
The center sleeves were machined out of 7075 Aluminum. The material doesn't give at all, so there's no way to use a traditional bushing design that involves being pressed into the beam. Hence the two-piece threaded-body design. I fabricated a special tool that grips the bottom half, twists, and squeezes the crap out of the beam. The beam may as well be welded solid.
These items are not available for purchase, but I figured I would at least share the pics.
The center sleeves were machined out of 7075 Aluminum. The material doesn't give at all, so there's no way to use a traditional bushing design that involves being pressed into the beam. Hence the two-piece threaded-body design. I fabricated a special tool that grips the bottom half, twists, and squeezes the crap out of the beam. The beam may as well be welded solid.
These items are not available for purchase, but I figured I would at least share the pics.
Re: Rear Subframe Bushing Hotness
Nice! Do you mind me asking what the material you used and where you got it?
Thomas
Thomas
Re: Rear Subframe Bushing Hotness
"That material would be Delrin...."
exST165 wrote:Nice! Do you mind me asking what the material you used and where you got it?
Thomas
jason yancey
stephens city va
87XR-88XR
NOVAMOG
"as long as you keep picking on me I will tend to mad post about me getting mad......"
stephens city va
87XR-88XR
NOVAMOG
"as long as you keep picking on me I will tend to mad post about me getting mad......"
- ALConfederate
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Re: Rear Subframe Bushing Hotness
Wow, impressive!
Any plans to sell them in the future?Grayson wrote: These items are not available for purchase, but I figured I would at least share the pics.
looks like a fair amount of time went into making those. Delrin isn't the easiest material to work with, especially trying to thread it.
Very nice.
Very nice.
1986 XR4Ti - 294rwhp/315ft-lbs
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
http://www.youtube.com/user/whitelx
1992 Mustang 5.0 notch - 434rwhp/445ft-lbs
http://www.youtube.com/user/whitelx
Great, i'm in a prepared class and i have poly bushes. I might need to fix that.
-Ray
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
Not currently, but we'll see. With my current facilities I don't think I could make these and offer them for under $300. Those aluminum center sleeves required a lot of turning because of that massive shoulder, so those alone took a lot of time.Any plans to sell them in the future?
The prototyping gobbled up hours and hours and hours. As for machining the Delrin, that was a piece of cake. It's by far the easiest material I work with. The down side to working Delrin is that it smells like formaldehyde as you work it, and if you're really tearing into it the fumes can get bad enough to start burning your eyes. I'll be installing a fume hood (i.e. charcoal-activated range hood) before I consider making another set of these.looks like a fair amount of time went into making those. Delrin isn't the easiest material to work with, especially trying to thread it.
Your solution is to move from CP to SM or DSP. I've never been able to figure out why you're running in a class where you should have a tube chassis.Great, i'm in a prepared class and i have poly bushes. I might need to fix that.
DSP or SM dont allow you to modify suspension pickup points, which i have.
-Ray
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
I also dont have any carpeting in the car, and kind of stitch welded some of the floor pan / //but that's a discussion for another thread.
Joe - front strut towers / rear coilovers.
Joe - front strut towers / rear coilovers.
-Ray
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
1985 Ford F150 - Tow Missile
1985 Merkur XR4Ti -#141 CP "Miss Daisy"
2005 Subaru LGT
http://www.cartct.com
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Like watching a hot porn chick. You can see it, but you can't have it lol.ALConfederate wrote:Not available for purchase? After you post those pics? Man, that's just cruel!
Very Nice man, Very nice!
Erik AKA MerkurSport's Bill payer. www.Merkursport.com The virtual Garage. Bring your own nudie calendar. You can now find MerkurSport on Facebook! http://www.facebook.com/pages/MerkurSpo ... 5756984607
- ALConfederate
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