Spohn LCA holes are too big?
#1
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Car: 89 GTA
Engine: 6.0L Procharged
Transmission: T-56
Axle/Gears: 4.10
Spohn LCA holes are too big?
I have an annoying clunk sound coming from the rear, I think it is from the Spohn LCAs. The factory bolts are M12 which measure 0.460" diameter. The holes in the Spohn LCA bushings are 0.500" so the bolts are quite loose and I think the LCAs are clunking around. Anyone else have this issue? Also, the holes in my Strange relocation brackets are 0.500" so they are also too big.
The factory holes on the subframe measure 0.460" so the bolts fit nice and tight through the factory holes.
I think I will machine some new brass bushings with a smaller ID so the bolts fit nice and snug inside the bushings?
The factory holes on the subframe measure 0.460" so the bolts fit nice and tight through the factory holes.
I think I will machine some new brass bushings with a smaller ID so the bolts fit nice and snug inside the bushings?
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Car: 87' IROC
Engine: L98
Transmission: T56
Re: Spohn LCA holes are too big?
I have an annoying clunk sound coming from the rear, I think it is from the Spohn LCAs. The factory bolts are M12 which measure 0.460" diameter. The holes in the Spohn LCA bushings are 0.500" so the bolts are quite loose and I think the LCAs are clunking around. Anyone else have this issue? Also, the holes in my Strange relocation brackets are 0.500" so they are also too big.
The factory holes on the subframe measure 0.460" so the bolts fit nice and tight through the factory holes.
I think I will machine some new brass bushings with a smaller ID so the bolts fit nice and snug inside the bushings?
The factory holes on the subframe measure 0.460" so the bolts fit nice and tight through the factory holes.
I think I will machine some new brass bushings with a smaller ID so the bolts fit nice and snug inside the bushings?
#3
Re: Spohn LCA holes are too big?
As a manufacturer we carefully consider hole sizes in every component. Too tight and the phone rings off the hook. We consider bolt size, powder coat thickness and extra clearance to ease assembly without being excessively loose.
ramey
#4
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Re: Spohn LCA holes are too big?
Interesting when I got mine from founders they just barely cleared the bolts. I will admit it would be easier with a little more clearance but they were as tight as anything factory.
I remember some specific words about why there were that way in the instructions.
Although I would be willing to put up $$$ that is probably does not matter much.
I remember some specific words about why there were that way in the instructions.
Although I would be willing to put up $$$ that is probably does not matter much.
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Car: 89 GTA
Engine: 6.0L Procharged
Transmission: T-56
Axle/Gears: 4.10
Re: Spohn LCA holes are too big?
So where does the movement occur in LCA bushing?
Is it between the OD of the poly and the ID of the clamshell?
i.e.) The inner metal bushing doesn't move at all?
Is it between the OD of the poly and the ID of the clamshell?
i.e.) The inner metal bushing doesn't move at all?
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Car: 87' IROC
Engine: L98
Transmission: T56
Re: Spohn LCA holes are too big?
I won't speak for the any Poly bushing because that is not something I have ever been interested in or seen in person.
#7
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Car: 89 GTA
Engine: 6.0L Procharged
Transmission: T-56
Axle/Gears: 4.10
Re: Spohn LCA holes are too big?
Ah, I didn't realize the factory rubber actually flexes to allow movement. What do you run for LCA bushings?
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#8
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Car: 89 GTA
Engine: 6.0L Procharged
Transmission: T-56
Axle/Gears: 4.10
Re: Spohn LCA holes are too big?
I'm resurrecting this thread because I still have the annoying clunk, and I am making new bushings for my Spohn LCA's right now with a 0.465" ID so the factory bolts fit perfectly inside the metal bushings. I will test drive the car and post results. If it fixes the issue I will be selling these bushings.
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Car: 1984 Z28
Engine: Alky 360
Transmission: TH400, Freakshow 9.5"
Axle/Gears: 9" 4.71
Re: Spohn LCA holes are too big?
Why not use new grade 8 hardware (1/2") and drill out the holes? That would be cheaper, easier, and you also have the piece of mind of replacing 25+ yr old bolts...
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Car: 89 GTA
Engine: 6.0L Procharged
Transmission: T-56
Axle/Gears: 4.10
Re: Spohn LCA holes are too big?
I did use 1/2" hardware on the axle side of the control arm because the holes are easy to access and drill out. However, there is only a few inches of clearance on the frame side so I don't see any way to properly enlarge the holes on the frame to 1/2". You can't fit a drill in there and drill straight through the factory holes. You would have to do it at an angle, which would give you an oval shaped hole. Have you done this?
My new bushings work fine with the factory M12 bolts, no more rattle.
My new bushings work fine with the factory M12 bolts, no more rattle.
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