SOHC.co.uk Forums > The Black Bomber Board
The (Original) Black Bomber thread
AshimotoK0:
--- Quote from: MrDavo on September 15, 2017, 03:44:12 PM ---I only rode a Black Bomber once, as a student in UMIST bike club in the 70's we'd go up the Cat & Fiddle for a club run, where we'd all swap bikes at the pub and go for test rides. God knows who was insured for what, noone asked. Up there was also the first time I rode a Commando, Suzuki RE5 rotary, 500 and 750 Kawasaki triples, a CB400 and who knows what else.
As a teenager, once I had become interested in bikes and engineering, I borrowed various workshop and owners manuals from my local library, unusually one of the modern 'state of the art' bikes they had a manual for was the CB450 (which shows how long ago I was a teenager ;D ). The thing that stuck in my mind was the torsion bar valve 'springs'. I get how a spring works, but I could never get my head round torsion bars - if you keep twisting and untwisting a piece of metal, why doesn't it get metal fatigue and break? Or a least stop being as 'springy'? Also, why? is it cheaper to make or does it give better control like desmos, ie no valve bounce at high revs?
--- End quote ---
See section 3 here Dave (pic is a snip from it)
https://www.dropbox.com/s/stqw7jm89xtt1rz/CB450%20Factory%20Service%20Manual%20.pdf?dl=0
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SteveD CB500K0:
Takes me back...
stress strain curves :)
K2-K6:
A coil spring is a torsion bar, just wrapped up into a neat package to fit in smaller places.
AshimotoK0:
--- Quote from: SteveD CB500F on September 15, 2017, 04:23:13 PM ---Takes me back...
stress strain curves :)
--- End quote ---
What ..to the days you too wore an anorak Steve ..!..
Woodside:
You never get rid of an anorak
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