And now, this week's mind-numbing, obsessive-compulsive, winter cabin-fever diversion:
Yamaha XS650 Valve train, Rocker Arm and Adjuster Tip Geometry
Geometries used in the motions of the Cam Lobes, Rockers, Adjusters and Valves in the stock XS650 Head
For your pleasure, or anguish, preliminary educational backround data can be found at these links:
http://www.accessnorton.com/valve-adjuster-contact-geometry-t15583.html
http://www.accessnorton.com/rocker-contact-concepts-practice-t15759.html
http://www.performanceboats.com/gallery/data/500/medium/rocker_geometry.jpg
http://www.flowspeed.com/harland-sharp.htm
http://speedtalk.com/forum/viewtopic.php?f=1&t=3847
http://speedtalk.com/forum/viewtopic.php?t=9978
http://speedtalk.com/forum/viewtopic.php?f=1&t=20333
http://www.thesamba.com/vw/forum/viewtopic.php?t=167378&postdays=0&postorder=asc&start=0
http://mantonpushrods.com/pushrod-info/determine-length/
http://www.shoptalkforums.com/viewtopic.php?f=1&t=75703
http://shoptalkforums.com/viewtopic.php?f=18&t=145307
http://www.hi-flow.com/hp012dvt.html
Pushrod type valvetrains have multiple components and geometries that can be, and must be, configured properly to achieve maximum performance and longevity.
Rather complicated, but affords the tuner some options, and the mechanic some headaches.
On the other hand, the Over-Head-Cam XS650 valve train geometry is rather fixed.
About the only things we can tweak, within reason, are valve stem lengths (within tight limits), camshaft grind profile (base circle and lift), and adjuster tips (spherical or swivel).
Valve springs and collars can be tweaked, which can affect valve train loads, but they don't alter the basic valve train geometry.
Later, we'll try to determine the optimum spherical radius for our stock valve adjuster tips.
Attached is another explanation of rocker arm geometries.
Yamaha XS650 Valve train, Rocker Arm and Adjuster Tip Geometry
Geometries used in the motions of the Cam Lobes, Rockers, Adjusters and Valves in the stock XS650 Head
For your pleasure, or anguish, preliminary educational backround data can be found at these links:
http://www.accessnorton.com/valve-adjuster-contact-geometry-t15583.html
http://www.accessnorton.com/rocker-contact-concepts-practice-t15759.html
http://www.performanceboats.com/gallery/data/500/medium/rocker_geometry.jpg
http://www.flowspeed.com/harland-sharp.htm
http://speedtalk.com/forum/viewtopic.php?f=1&t=3847
http://speedtalk.com/forum/viewtopic.php?t=9978
http://speedtalk.com/forum/viewtopic.php?f=1&t=20333
http://www.thesamba.com/vw/forum/viewtopic.php?t=167378&postdays=0&postorder=asc&start=0
http://mantonpushrods.com/pushrod-info/determine-length/
http://www.shoptalkforums.com/viewtopic.php?f=1&t=75703
http://shoptalkforums.com/viewtopic.php?f=18&t=145307
http://www.hi-flow.com/hp012dvt.html
Pushrod type valvetrains have multiple components and geometries that can be, and must be, configured properly to achieve maximum performance and longevity.
Rather complicated, but affords the tuner some options, and the mechanic some headaches.
On the other hand, the Over-Head-Cam XS650 valve train geometry is rather fixed.
About the only things we can tweak, within reason, are valve stem lengths (within tight limits), camshaft grind profile (base circle and lift), and adjuster tips (spherical or swivel).
Valve springs and collars can be tweaked, which can affect valve train loads, but they don't alter the basic valve train geometry.
Later, we'll try to determine the optimum spherical radius for our stock valve adjuster tips.
Attached is another explanation of rocker arm geometries.