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View Full Version : Radial clutch cylinder sizing

bradders
29-Nov-2006, 22:11
follwing other post, which bore woudl be best on a 996? I have a 19x20 (I think!) brake to fit, would 16x18 be right for the clutch?

what difference does the bore make?
Bungi
29-Nov-2006, 22:38
follwing other post, which bore woudl be best on a 996? I have a 19x20 (I think!) brake to fit, would 16x18 be right for the clutch?

what difference does the bore make?

the brake and clutch sizes are differant, thats not unusual.

diffreant sizes give diffeant level of feel / pull rate, for example on the brake you can overdoit and remove the feel from the brake, clutch is similar scenario but less crucial.
bradders
29-Nov-2006, 22:42
the brake and clutch sizes are differant, thats not unusual.

diffreant sizes give diffeant level of feel / pull rate, for example on the brake you can overdoit and remove the feel from the brake, clutch is similar scenario but less crucial.

so which would you go for mate - 16x18 a good compromise on the clutch?
bradders
29-Nov-2006, 22:43
ok - just seen other post, 16x18 it is :D
ducv2
30-Nov-2006, 12:03
Just wondered why you were fitting a radial clutch cylinder ?? as feel cant be an issue?
bradders
30-Nov-2006, 13:05
being honest, to match the brake!! nothing more than asthetics...
Shazaam!
30-Nov-2006, 15:54
The early OEM clutch pump master cylinder has a 13mm bore. 13x20 (measured.) The master cylinder got a smaller piston for 2001 (the ones with the silver levers.) This is good for about a 10% reduction in pull force.

When using the larger bore 16x18 (the smallest one Brembo makes) you'll find that it makes the lever harder to pull than the stock master. This should be used with an oversized slave cylinder for a reasonable pull. If you have a 2001 or later updated slave cylinder you'll be OK.
ducv2
30-Nov-2006, 16:10
being honest, to match the brake!! nothing more than asthetics...

Sounds good to me !!!!!!!!
bradders
30-Nov-2006, 16:48
The early OEM clutch pump master cylinder has a 13mm bore. 13x20 (measured.) The master cylinder got a smaller piston for 2001 (the ones with the silver levers.) This is good for about a 10% reduction in pull force.

When using the larger bore 16x18 (the smallest one Brembo makes) you'll find that it makes the lever harder to pull than the stock master. This should be used with an oversized slave cylinder for a reasonable pull. If you have a 2001 or later updated slave cylinder you'll be OK.

so, in laymans terms.....what it an oversized slave cylinder? is that the plastic thing which holds the fluid?
maybe a good reason to chnage to an anodised one..... :D
TP
30-Nov-2006, 16:56
so, in laymans terms.....what it an oversized slave cylinder? is that the plastic thing which holds the fluid?
maybe a good reason to chnage to an anodised one..... :D

The clutch slave cylinder is the one by your left boot when you're on the bike. Where the front sprocket cover is.
bradders
30-Nov-2006, 19:44
ah, ok thanks. Where would I get one of those and are they a standard fitment?
TP
30-Nov-2006, 20:04
If you want one that gives you a lighter action see Nelly/JHP.
Bungi
30-Nov-2006, 20:12
so which would you go for mate - 16x18 a good compromise on the clutch?

you could opt for a 19x20 which if you have a std slave cyl wil give you a lighter clutch
bradders
30-Nov-2006, 21:32
you could opt for a 19x20 which if you have a std slave cyl wil give you a lighter clutch

ok, that might be the way then coz the italian geezer sells em at the same price
Shazaam!
01-Dec-2006, 03:33
you could opt for a 19x20 which if you have a std slave cyl wil give you a lighter clutch
You've got it reversed: the smaller the clutch master cylinder diameter -the lighter the pull; the larger the slave cylinder diameter - the lighter the pull. So, the (early) 13mm stock master has a lighter pull than the 16mm Brembo radial which has a lighter pull than the 19mm diameter of the 19x20.