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Honda CB750/900/1100F SuperSport Website: SuperSport Forums


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Richlkyl000
Twinstar
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Joined: Jan 10, 2011
Posts: 161
Location: Burlington, WA

PostPosted: Wed Sep 17, 2014 3:57 am Reply with quote Back to top

Has anyone ever drilled the return hole on the master cylinder larger? I dont think it would change much except the fluid could return faster to the reservoir. Question
 
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sonicrete
Red CB1100F
Red CB1100F



Joined: Aug 19, 2003
Posts: 15472
Location: Lancaster,Ohio

PostPosted: Wed Sep 17, 2014 4:30 am Reply with quote Back to top

The main is large enough. The "release hole" is small for a reason. Someone tried it and it made the master cylinder have a dead travel to work.
 
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Richlkyl000
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Joined: Jan 10, 2011
Posts: 161
Location: Burlington, WA

PostPosted: Wed Sep 17, 2014 4:37 am Reply with quote Back to top

sonicrete wrote:
The main is large enough. The "release hole" is small for a reason. Someone tried it and it made the master cylinder have a dead travel to work.

sonicrete by dead travel to work do you mean that basically if you start to apply pressure to pedel it will have no travel or real feel to the pedal because there is no back pressure? Sorry if that confusing.
 
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krgood0
CB1100F
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Joined: Jun 18, 2006
Posts: 2527
Location: UK

PostPosted: Wed Sep 17, 2014 8:41 am Reply with quote Back to top

It was designed to work correctly with the small hole, so best to leave it as is, just keep it clear.

Keith
 
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sonicrete
Red CB1100F
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Joined: Aug 19, 2003
Posts: 15472
Location: Lancaster,Ohio

PostPosted: Wed Sep 17, 2014 6:29 pm Reply with quote Back to top

I travels "dead" as in no pressure and travels to give more lever play.
 
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genesound
Red CB1100F
Red CB1100F



Joined: Feb 20, 2006
Posts: 11919
Location: Studio City, California

PostPosted: Wed Sep 17, 2014 10:18 pm Reply with quote Back to top

When you first push on the pedal or pull the lever, the small hole is still exposed. If it's too large it lets too much fluid rush through the hole as you move the piston the first bit until you're past it. Keeping the hole small, it tends to not flow too much, and so once the piston is past it you haven't lost a bunch of lever and fluid to just emptying the line, so you can build pressure sooner on the piston travel, and have a "higher" pedal or lever action.

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Richlkyl000
Twinstar
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Joined: Jan 10, 2011
Posts: 161
Location: Burlington, WA

PostPosted: Thu Sep 18, 2014 12:47 am Reply with quote Back to top

genesound wrote:
When you first push on the pedal or pull the lever, the small hole is still exposed. If it's too large it lets too much fluid rush through the hole as you move the piston the first bit until you're past it. Keeping the hole small, it tends to not flow too much, and so once the piston is past it you haven't lost a bunch of lever and fluid to just emptying the line, so you can build pressure sooner on the piston travel, and have a "higher" pedal or lever action.

Okay thank you guys. Well that settles that.
 
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