Lever Pivots Mechanical advantage ??

[Gary B]

Howdy all,
Here's a question that I'm hoping someone can answer for me.

I have bought several different brands of Levers to suit both Gasser's & Sherco's, But when we change them the clucth quite often will be heavier / lighter.
I've done some measurements and the distance between the pivot hole (for the mountinhg bolt) and the pin hole that works onto the back of the master cylinder can vary by 2 - 4 mm. Does anybody know which brand has the biggest distance here . The bigger the distance between these two points the greater mechanical advantage you will get, so the clutch should be lighter, or you can get more pressure onto the front brake.
I've got AJP levers, Apico levers & V levers. As of yet I haven't bought any S3 levers.
I've attached a picture below for the measurements I'm looking for.

Hoping someone can advise me here.

Thanx in advance & have a Great New Year.

Cheers,
Gary B.

[The Hell Team]

Hi Gary
Yes i have measured all these up about 18 months ago, and seem to remember the shortest ones were about 14mm and most were in the 16-17mm range , with i think the latest Scorpa SR levers having the biggest mechanical advantage.
I'll drag out the info when we go back and let you know.
Do you want drop pin (gg) or straight pin (sherco)?

[Gary B]

Thanx Paul.
Info on both if ya got it, as you know Team Boniface has a Sherco & Gassers.

Cheers,
Gary B.

[The Hell Team]

Glad I document this stuff, the Scorpa lever had the shortest distance!

[Joe Henderson]

Dear Gary,

Correct me if I am wrong, but I thought that the shorter the distance between the fulcrum and the load meant less force, for a given effect, at the end of the lever ( where your finger operates).

I think that you have go a bit deeper into the geometry to measure and work out the lever ratios for each make of lever. Are they all the same?

It also matters where in it's working arc the lever is positioned.

And don't get me started on linkage rear suspension, Ford Pinto engine rocker arms and swept spreader yacht masts!

Blame Archimedes.

Bloody old men in white robes and beards. They have been interfering with our actions all through history and myth, up to and including the carpenters son who just had a birthday/appropriated pagan festival celebrated.

It's all relative and I hate my relatives.

Regards,

Joe.

[Gary B]

Paul,
Thanx Heaps .
And Joe, your a Bugger, I thought I had something worked out, now Im gunna have to get out the slide rule & put my thinking cap on.
My thinking cap doesn't fit very good at this time of the year. (too much piss & good food)

Cheers,
Gary B.

[Steve Holzhauser]

Your on the right track Gary, you are looking for smoother progressive feel which comes with the wider travel of arc, same principal we employed way back of lengthening the actuating arm on the Ty's to give a softer and smoother transition of clutch engagement.