A few years ago I remember a thread here about grinding away the skirt or web between ports on valve rotors but it seems to have disappeared.
Recently I acquired a Yamaha YCB-661 and one of its excellent playing characteristics is a very clean "finger slur". It either was built with this feature or someone has modified it.
Any input/opinions on this mod?
Valve rotor skirt/web removal?
- bigtubby
- 4 valves
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Valve rotor skirt/web removal?
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- Dan Schultz
- TubaTinker
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Re: Valve rotor skirt/web removal?
A few years ago I experimented with removing material from rotor skirts to lessen friction and reduce weight. I thought I put them on my web pages but don't see them there now and cannot locate the images. I still have one of those rotors somewhere. I'll try to dig it out and send you some pics.bigtubby wrote:A few years ago I remember a thread here about grinding away the skirt or web between ports on valve rotors but it seems to have disappeared.
Recently I acquired a Yamaha YCB-661 and one of its excellent playing characteristics is a very clean "finger slur". It either was built with this feature or someone has modified it.
Any input/opinions on this mod?
Dan Schultz
"The Village Tinker"
http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.
"The Village Tinker"
http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.
- bigtubby
- 4 valves
- Posts: 747
- Joined: Mon Jan 07, 2013 9:43 pm
- Location: Ohio
Re: Valve rotor skirt/web removal?
Thank you Dan!Dan Schultz wrote:A few years ago I experimented with removing material from rotor skirts to lessen friction and reduce weight. I thought I put them on my web pages but don't see them there now and cannot locate the images. I still have one of those rotors somewhere. I'll try to dig it out and send you some pics.bigtubby wrote:A few years ago I remember a thread here about grinding away the skirt or web between ports on valve rotors but it seems to have disappeared.
Recently I acquired a Yamaha YCB-661 and one of its excellent playing characteristics is a very clean "finger slur". It either was built with this feature or someone has modified it.
Any input/opinions on this mod?
What I remember was a thread her on the forum discussing this as an improvement in air flow and cleaner transitions between valve positions. On closer inspection, the Yamaha's ports in the rotors don't go straight through, but are concave. A photo:
American sailboats, airplanes, banjos, guitars and flutes ...
Italian motorcycles and cars ...
German cameras and tubas ...
Life is Good.
Italian motorcycles and cars ...
German cameras and tubas ...
Life is Good.
- Dan Schultz
- TubaTinker
- Posts: 10424
- Joined: Thu Mar 18, 2004 10:46 pm
- Location: Newburgh, Indiana
- Contact:
Re: Valve rotor skirt/web removal?
AHA! This is something quite different from what I was doing. You might try searching for 'scooped' rotors.bigtubby wrote:... What I remember was a thread here on the forum discussing this as an improvement in air flow and cleaner transitions between valve positions. On closer inspection, the Yamaha's ports in the rotors don't go straight through, but are concave. A photo:
Dan Schultz
"The Village Tinker"
http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.
"The Village Tinker"
http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.