SOHC.co.uk Forums > CB500/550
CB550F Double Disc's
Trigger:
John, What do you mean, nearly 100%?
I went with this guys advice because it was straight forward advice and the rest had turned there explaining into a book.
This link also says, No mod to the speedo drive.
Johnwebley:
when I fitted the caliper mounting,I carefully filed the top T piece,so not to use washers as spacers ,other than that,
it was identical !!
this is my conversion
http://www.sohc.co.uk/index.php?topic=5572.0
Trigger:
Cheers John, You had me worried a bit then.
Trigger:
I was thinking the same things oddjob. Have not started it yet. Still collecting parts, Have 2 calipers and a disc from a CB500T. Was trying to work out the master.
BlackSheep:
The theory about the fluid displacement being greater with a larger piston is valid. However, there are much more important things to consider. Like keeping the calipers' correctly adjusted, using pads with a higher coefficient of friction, using braided hoses, not leaving braking until it's more than too late, etc. etc.
And despite what logic might dictate, a narrow bore master cylinder (MC) piston (bike's stock part) will give a smoother and more subtle action when a second front disc is fitted.
Sure, the fluid transfer will be less with an 11mm bore compared to one of 16mm, by a little less than a factor of 2.16. but you'll have twice the breaking surface available.
You'll max-out the pressure in the breaking system (and hence breaking force on discs) before you bottom-out the break lever.
Track-day racers often use a "smaller than stock" master cylinder setup on their clutch for similar reasons, but in the opposite sense, i.e. they're feeding-in energy - not dissipating it.
So by fitting a second disc set-up using stock MC, you'll get a smoother braking system - not a stronger one. If you want a sharper braking system, just fit the MC with a larger diameter (say 16mm) and forget about the second disc/caliper/pipes, save weight at the same time.
Does the single disc set-up look as cool as the twin disc? Hell no!
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