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Old 11-24-2012, 08:05 PM   #1 (permalink)
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Master Cylinder Bore?

Hi All,
I have a PM 11/16 Hydro Clutch hand control and was looking to use a trans end cover that calls for a 9/16 master cylinder.

Will it be ok to use a hand control with a large than called for master cylinder?

Thanks
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Old 11-24-2012, 08:34 PM   #2 (permalink)
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Eh Tony .. Hydraulic pressure is measured by Psi (per square inch of force) applied depending on the length of line & the caliper bore size.

It also is directly associated with the weight of the bike & weight of the rider which reflects the forward momentum of the total weight. I dont have the equation in front of me at the moment but if you use a larger bore Master on a caliper which is sized for a smaller bore less pressure will be needed for lock up.

The reason they match master bore to caliper bore is provide a maximum (Panic) squeeze without probability of locking up the brake rotor.

Increased pressure @ the master increases pressure @ the caliper.
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Old 11-24-2012, 08:46 PM   #3 (permalink)
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Quote:
Originally Posted by Rollmeaway View Post
Eh Tony .. Hydraulic pressure is measured by Psi (per square inch of force) applied depending on the length of line & the caliper bore size.

It also is directly associated with the weight of the bike & weight of the rider which reflects the forward momentum of the total weight. I dont have the equation in front of me at the moment but if you use a larger bore Master on a caliper which is sized for a smaller bore less pressure will be needed for lock up.

The reason they match master bore to caliper bore is provide a maximum (Panic) squeeze without probability of locking up the brake rotor.

Increased pressure @ the master increases pressure @ the caliper.
Thanks, how would that work on something that is just pushing a rod? Maybe less hand pressure needed to seperate the clutch plates?
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Old 11-24-2012, 09:35 PM   #4 (permalink)
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If you are talking about a hydraulic clutch with an oversized master, the slave cylinder & rod would work easier. The pressure used to activate the slave would be reduced & therefore alot less pressure would have to be exerted at the lever. You should be good to go with an added bore size at the master & an easier operating force. Key is to bleed it properly & once that is achieved your sailin'. If you have difficulty bleeding the slave (because it is lower than the master) attach a vacuum hose over the bleeder screw & raise the hose higher than the master. That way you will be sure that allllll the air is no longer in the slave. Once you have done that lock up the bleeder screw & yer laughin'

Good Choice
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Last edited by Rollmeaway; 11-24-2012 at 09:43 PM.
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Old 11-24-2012, 09:43 PM   #5 (permalink)
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Quote:
Originally Posted by Rollmeaway View Post
If you are talking about a hydraulic clutch with an oversized master, the slave cylinder & rod would work easier. The pressure used to activate the slave would be reduced & therefore alot less pressure would have to be exerted at the lever. You should be good to go with an added bore size at the master & an easier operating force. Key is to bleed it properly & once that is achieved your sailin'. If you have difficulty bleeding the slave (because it is lower than the master) attach a vacuum hose over the bleeder screw & raise the hose higher than the master. That way you will be sure that allllll the air is no longer in the slave.

Good Choice
Thank You, I appreciate it!
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Old 11-24-2012, 09:47 PM   #6 (permalink)
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Eh Tony ... my pleasure
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And we rolled...
And we rolled...... clean out of sight




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