Mac
Member
Do any of you guys have a way to test the speed of a successfull overdrive install. Even if you could make 3-5 mph or 5-6 increase its going to require a timing system to prove the results. The work required seems fairly simple but seat of the pants testing or looking at your speedo won't mean much.
jabber800
New member
Overdrive on a Yamaha clutch system will work.. How efficient it is is questionable. The advantage I have seen with my sleds is the ability to gear low for excellent short run blasts with the ability to pull good top end #'s under IDEAL conditions... Going out to a radar run where you have more time to accelerate I tend to gear taller to finish the run at a 1 to 1 ratio.. Seems to have been the ticket for me..
Essarex
New member
I enjoy these discussions. They help share information and stimulate thought. One could argue about the validity of the info, but nonetheless it represents another point of reference that is valuable, if for nothing else.
I once met a professor who was a recognized expert witness on the subject of Productivity (as it would relate to industrial labor negotiation). He would tell you that Productivity can be measured/defined in as many ways as there are people negotiating it. To relate this for us motorheads, let's think about the definition of automobile efficiency. Are the cars that get the highest mpg the most efficient? Or are the cars that make the most hp per gallon used, the most efficient? Perhaps the cars that make the most hp per liter of displacement, are most efficient? Or maybe we consider the cars that cost the least to own (initial price, maintenance costs, mpg, etc) to be the most efficient? Hmmmmmm?
On this matter of clutch efficiency, is it most efficient to run in a 1:1 ratio, if getting there means you have to gear up your chaincase by increasing the size of the top gear? thereby increasing the rotating mass and the radius by which that mass rotates around the jackshaft? Or maybe you decreased the lower gear and caused the chain to wrap around a smaller radius and had to tighten up your chain idler creating more chain wrap?
there are many, many variables to consider, but it is always fun to pursue perfection.
I once met a professor who was a recognized expert witness on the subject of Productivity (as it would relate to industrial labor negotiation). He would tell you that Productivity can be measured/defined in as many ways as there are people negotiating it. To relate this for us motorheads, let's think about the definition of automobile efficiency. Are the cars that get the highest mpg the most efficient? Or are the cars that make the most hp per gallon used, the most efficient? Perhaps the cars that make the most hp per liter of displacement, are most efficient? Or maybe we consider the cars that cost the least to own (initial price, maintenance costs, mpg, etc) to be the most efficient? Hmmmmmm?
On this matter of clutch efficiency, is it most efficient to run in a 1:1 ratio, if getting there means you have to gear up your chaincase by increasing the size of the top gear? thereby increasing the rotating mass and the radius by which that mass rotates around the jackshaft? Or maybe you decreased the lower gear and caused the chain to wrap around a smaller radius and had to tighten up your chain idler creating more chain wrap?
there are many, many variables to consider, but it is always fun to pursue perfection.