SOHC.co.uk Forums > CB500/550
CB550F Double Disc's
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!
Ewan 500 K1:
--- Quote from: Johnwebley on April 19, 2014, 01:07:51 AM ---
--- Quote from: trigger6969 on April 18, 2014, 09:48:43 PM ---I am working from this:
http://www.salocal.com/sohc/tech/dual_disks/dual_disks.htm
--- End quote ---
that explanation/advice is so good,I hadn't found that,but its almost 100% what I ended up doing,
--- End quote ---
yep he's got it wrong about the unmodified spedo drive plate. The alternative to the one in oddjobs link is to modify the drive plate as per attached photo, ie cutting off excess and then bending over two tangs to fit the flats on the hub. Original drive plate on the right, modified one on the left. But.... this only works if have a hub with the flats on it, like the one in the second attached picture
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Also , like oddjob, I fitted the mudguard stay between the pivot arm bracket and the fork tube .... didnt need to use any shims or file anything to get the pads sitting parallel with the disc
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I do still need to find a longer adjuster bolt as oddjob suggests
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