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Thread: Check you upper wishbone mount rods now and again, plus new bushes

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  1. #21 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    frequent forum contributor Club Member
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    I'm not sure any kind of hardening is a good idea for a suspension component that is obviously undergoing some bending stresses. Increased toughness maybe, but hardening probably not. The chap who reckoned his bent pins had done their job was pretty much on the money for me.
    Original builder of SWB Cabrio chassis no. 04-33 reg. no. CRN540Y - had a 2.8L Cologne V6 when I sold it in 2011
    Briefly owned Marlin Berlinetta Q670XBB for about 4 months in 2012
    Did own SWB Marian 1800TC Roadster Q741LPP - modified for trials by Fourtune Engineering
    Now own Marlin Sportster with 3.5L BMW straight six powerplant P764DOD - proof that absolute power corrupts absolutely!
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  2. #22 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    frequent forum contributor Club Member Alan c's Avatar
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    I agree unless you have hardness testing machine you wont know what you have. Buy material of known spec - cheaper than a funeral

    Quote Originally Posted by acbluemarlin View Post
    I'm not sure any kind of hardening is a good idea for a suspension component that is obviously undergoing some bending stresses. Increased toughness maybe, but hardening probably not. The chap who reckoned his bent pins had done their job was pretty much on the money for me.
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  3. #23 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    frequent forum contributor Club Member Patrick's Avatar
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    I've not done anything with them yet, I had a bunch of stuff, including broken seat that held me up. I'm considering making brackets to go on the outsides of the wishbone mounts which would greatly reduce the stress on this part.

    I think I may try the new ones as is, then see what happens after a couple trips around the area (roads are terrible here). If the new ones bend I’ll make another set and look at hardening. If they don’t it’s all good. I prefer bend to break as at least you get warning.
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  4. #24 Re: Check you upper wishbone mount rods now and again, plus new bushes 
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    Bending rather than breaking is precisely why I wouldn't try and home harden this part. If you want something a bit stronger maybe try something like EN16 or EN24
    Original builder of SWB Cabrio chassis no. 04-33 reg. no. CRN540Y - had a 2.8L Cologne V6 when I sold it in 2011
    Briefly owned Marlin Berlinetta Q670XBB for about 4 months in 2012
    Did own SWB Marian 1800TC Roadster Q741LPP - modified for trials by Fourtune Engineering
    Now own Marlin Sportster with 3.5L BMW straight six powerplant P764DOD - proof that absolute power corrupts absolutely!
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  5. #25 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    regular forum contributor Club Member
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    The pin looks as if it may only be supported in 2 locations next to each of the bushings allowing bending inside the supporting steel box member via deflection within the bushings? Thought occurred that if there was a steel sleeve for the pin that supported its full length between the bushings the unsupported length would be reduced and the pin forces would be limited to the leverage over the bushing length . This would mean however that the pin would take more shear force in shock loading and there would be no transfer of such forces into bending of the pin which might be the intention of the original design---My Sportster kit is coming mid June (hopefully) hence guessing a bit on the detail
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  6. #26 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    frequent forum contributor Club Member Patrick's Avatar
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    Yeah it's only support in the centre, not on the outsides. The poly bushes have a metal sleeve on the inside. Im using large washers either side of each bush to prevent the polyurethane from moving off over the nuts that hold them. I've double stacked them on the outsides.
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  7. #27 Re: Check you upper wishbone mount rods now and again, plus new bushes 
    frequent forum contributor Club Member Patrick's Avatar
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    Quote Originally Posted by stevejgreen View Post
    I know of no universal standard colour code that can be applied to suspension bushes, certainly not Superflex.
    Powerflex however offer four colours Red, Yellow, Purple and Black in increasing stiffness, but not every bush is available in every colour/stiffness.
    In the case of the ford TCA bushes needed for the Sportster you can buy the purple or black. How hard the material is measured with a shore durometer; there's a nice set of examples on wikipeadia https://en.wikipedia.org/wiki/Shore_durometer

    Powerflex list the shore of their bushes here: https://www.powerflexusa.com/how-to-choose
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