WHYDIYGTE...Bronze in place of poly?
Discussion
heightswitch said:
Because I can and because I need to in this particular instance The std road car is a totally different arrangement and their is no need to use anything other than rubber if we're all honest!
Short reply..I am at work.
Right...back home. The longer answer is...
The race car runs 8" wheels and 600M section rubber. This will not fit under the standard arches. In addition the wheel and tyre arrangement will foul the lower pivot rods. Solution. Weld piggy back mounts onto the adjusters and lower wishbones. This moves the damper upward and inboard and allows the deeper inset on the rim.
The downside is that the damper lower mount then runs in single shear and the different location creates a rotational force on the rear adjuster, This prematurely knackers the poly bush. Solution is to use a much harder bush material which resists the rotational force. Hence the use of Phosphor Bronze. There are possibly other ways to do it but as ever I usually work through the solution myself and settle on the solution I am happy with.
The bushes are made up. Will post a couple more pics when its all built up again.
N.
N.
Short reply..I am at work.
Right...back home. The longer answer is...
The race car runs 8" wheels and 600M section rubber. This will not fit under the standard arches. In addition the wheel and tyre arrangement will foul the lower pivot rods. Solution. Weld piggy back mounts onto the adjusters and lower wishbones. This moves the damper upward and inboard and allows the deeper inset on the rim.
The downside is that the damper lower mount then runs in single shear and the different location creates a rotational force on the rear adjuster, This prematurely knackers the poly bush. Solution is to use a much harder bush material which resists the rotational force. Hence the use of Phosphor Bronze. There are possibly other ways to do it but as ever I usually work through the solution myself and settle on the solution I am happy with.
The bushes are made up. Will post a couple more pics when its all built up again.
N.
N.
Edited by heightswitch on Wednesday 14th November 14:50
phillpot said:
Slow M said:
What, no grease zerk?
May have this all wrong but doesn't phospher bronze have self lubricating properties (particularly if soaked in oil prior to assembly) ?Here we go clicky , thought I hadn't completely made it up !
Oilite is a sintered material with a porous structure to retain lubricant. It could have a very similar material composition to phosphor bronze but it's the processing method that gives it self- lubricating properties.
A bush machined from a lump of phosphor bronze ain't quite the same.
Awaits correction!
Edited by GadgeS3C on Saturday 17th November 18:12
All fitted up.
Bernard we cale them "nipples" in the UK. Will see how we get on but considering the application, speed of movement etc I think we should be OK. The top hats have an 1/8th gap between them which is packed with grease..If it becomes a problem it is only a 2 min job to tap the centres of the tube housings.
Oilite is a trade name which was pioneered by the Chrysler corp for sintered (powdered) Phosphor bronze bearings. It actually saved the company during the depression!! Their are various grades of Brass / Bronze, These are PB1. regardless of grades it is good practise to soak them in oil, usually SAE30, for 24 hrs before fitting But obviously sintered is purpose made for soaking and provides a permanent lubrication.
In the case of these bearings. The bearing is an interferance fit into the housing, and the stainless sleeve locks on the pin. The bearing surface is the sleeve outer against the bronze inner.
Either way you hopefully will see the reason for the solid bush material with the assembled picture.
N.
Edited by heightswitch on Saturday 17th November 16:39
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