The Miata Bushing MEGAthread: Heirarchy, DIY delrin dimensions, info and discussion
#123
949 site says the ES bushings are 88A except for the front uppers which they say are 95A. Thinking I've seen that somewhere else too but don't remember where off hand. I've used Prothane and ES both and don't really recall any real difference but didn't do them both at the same time.
https://949racing.com/energy-suspens...ngs-miata.aspx
I'm also getting ready to drill out my front uppers for the bushings so am in for any tips. Think freezing them was mentioned along with using a lathe for higher speed.
https://949racing.com/energy-suspens...ngs-miata.aspx
I'm also getting ready to drill out my front uppers for the bushings so am in for any tips. Think freezing them was mentioned along with using a lathe for higher speed.
#124
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I havnt tried it yet, but I think freezing them is a good idea. You almost have to use a lathe, as there is no other good way to hold it without it distorting, like in a vise; and you need to hold it true to the drill axis.
#134
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More info on sleeve diameter questions. after loking at cast in part numbers on my V8r bushings comparing the font and number scheme I think they are Prothane not ES. question is does anybody know the sleeve diameters for the Prothane miata Kit? if they are like the V8r they are all 7/8"
RUCA-O: 0.750"
FUCA: 0.813"
Everything else: 0.875"
ES is the same
#135
off the shelf Whiteline FUCA 7/8" $63 for just the front uppers from summit. not exactly a cheap addition.
Whiteline W52208A Control arm - upper inner bushing
#136
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dam. .813 how the hell did an engineer arrive at that size? Hm how much can be forced in there I wonder. Urathane is not really soft though.
off the shelf Whiteline FUCA 7/8" $63 for just the front uppers from summit. not exactly a cheap addition.
Whiteline W52208A Control arm - upper inner bushing
off the shelf Whiteline FUCA 7/8" $63 for just the front uppers from summit. not exactly a cheap addition.
Whiteline W52208A Control arm - upper inner bushing
To complicate the issue, that location happens to have the largest pivot bolt in the car at 15mm, so its also the smallest wall thickness sleeve. For the poly retrofit guys, using a 0.750" sleeve, its running on the ragged edge of wall thickness at about 0.080". Must use high tensile material there. 4130 drawn tubing has worked great so far. No need to tighten that bolt past 40lb ft.
#137
I'm running Delrin in my FUCAs now (mega FSM torque specs have nothing on the nice ~9/64" thick cr-mo sleeve), so I will try enlarging my unused FUCA ES bushings this weekend with:
- freezer
- 7/8" drill bits
- size G hand reamer
I think the drill bits will work fine. I have spare SAE 863 bushings, so I'll just enlarge the hole enough to get a nice tight fit on the bronze.
- freezer
- 7/8" drill bits
- size G hand reamer
I think the drill bits will work fine. I have spare SAE 863 bushings, so I'll just enlarge the hole enough to get a nice tight fit on the bronze.
#140
No idea who the hell came up with that, Id guess it wasn't an Enginear (lol). More than likely, it was a bushing already in existance from another platform that they reused so they didn't have to make new molds... or something.
To complicate the issue, that location happens to have the largest pivot bolt in the car at 15mm, so its also the smallest wall thickness sleeve. For the poly retrofit guys, using a 0.750" sleeve, its running on the ragged edge of wall thickness at about 0.080". Must use high tensile material there. 4130 drawn tubing has worked great so far. No need to tighten that bolt past 40lb ft.
To complicate the issue, that location happens to have the largest pivot bolt in the car at 15mm, so its also the smallest wall thickness sleeve. For the poly retrofit guys, using a 0.750" sleeve, its running on the ragged edge of wall thickness at about 0.080". Must use high tensile material there. 4130 drawn tubing has worked great so far. No need to tighten that bolt past 40lb ft.