UK Monster Owners Club Forum » .: Technical :. » Mods & How To's » Cush Drive....

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Old 08-03-2019, 10:15 PM   #16
damien666
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I’ve had poly ones on mine for a few years. Made by AFAM.
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Old 08-03-2019, 11:17 PM   #17
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My bushes came in a sleeve

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Old 09-03-2019, 02:21 PM   #18
Mr Gazza
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I had a long chat with my chartered engineer friend this morning about altering the SSSA poly bushes to fit the Brembo wheel. To cut a long CV short, he has worked with Peter Williams, Lotus and the MOD among others, so he knows what he's talking about.

We came to the conclusion that cutting the poly bushes or altering their dims and surface is fraught with difficulty and brings uncertainty about their performance. Think about it.. Altering the volume of the shock absorbent material, alters it's shock absorbing property, by virtue of how much of it is left to absorb the shocks.
Altering the wheel is also a very unknown quantity, without inspecting and measuring one in detail... Anyone on here willing to have a wheel machined out to try??.. I thought not.

As far as I'm concerned this is too problematic a venture to bother with, given the high mileages that the originals put in and their relative cheapness compared to a conversion.

We agreed that the standard bush material is very long lived and does not usually deteriorate by hardening. The time to worry is when visible disintegration is seen.

Since the problem is in the play that seems to develop in the pin/bush interface. the cheapest solution suggested is to knurl the pins to take up the fit.
It would only be necessary to knurl a short length of each pin. this could be done multiple times on different areas of the pin each time... I think we would be looking at well over 100,000 miles service out of the same bushes and pins here... My kind of fix...
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Old 09-03-2019, 02:45 PM   #19
emzedder
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MZ's will do loads of miles, the rubber Cush drive (albeit managing lower output) suffer compression and shrinkage over time. I simply place a strip of thinnest steel shim every other pole and that takes up slack. That's what I'm generally doing with the SS.
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Old 09-03-2019, 03:23 PM   #20
350TSS
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[I]"Since the problem is in the play that seems to develop in the pin/bush interface. the cheapest solution suggested is to knurl the pins to take up the fit.
It would only be necessary to knurl a short length of each pin. this could be done multiple times on different areas of the pin each time... I think we would be looking at well over 100,000 miles service out of the same bushes and pins here... My kind of fix... "
I think knurling will increase the wear as there will be fewer points/areas of contact with much higher load on those points - I would have them plated - anything that will take up the slack - copper / zinc / nickel / chrome. so long as the metal is harder than the rubber it should stay where it is put
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Old 09-03-2019, 09:52 PM   #21
Bitza
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Interesting re; correcting wear of standard set up, but the later ploymer type cush drive bush/pins do offer the potential to loose a fair bit of rotating weight over the old type cush drive, with those heavy pins. Bitza.
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Old 10-03-2019, 11:54 AM   #22
Chriswilly
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The recomendation is Silicone Grease I believe. Is this so?
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