Check My Maths Please

[Richie-Van-GTi 71 2 Cars]

Hopefully I have worked this out correctly but need to be sure. Im making a twin cable linkage for my carbs but trying to retain full throttle movement for driveability.

Anyway Ive done some measuring and Ive come up with the following.

 

Throttle pedal takes up 70mm of cable movement.

Carb throttle cam takes up 22mm of cable movement.

 

So I reckon if I use a bar drilled and slotted for a cable either end and pivoted in between with the following measurements I will get normal foot operation.

 

cable to pedal drilled at 35mm from pivot and cable to carbs drilled at 11mm from pivot. I work this out to give approx 60 degrees of movement about the pivot point so wouldnt need to have a curved face for cable to run in, just a well slotted bar?

[Rippthrough 98]

Hopefully I have worked this out correctly but need to be sure. Im making a twin cable linkage for my carbs but trying to retain full throttle movement for driveability.

Anyway Ive done some measuring and Ive come up with the following.

 

Throttle pedal takes up 70mm of cable movement.

Carb throttle cam takes up 22mm of cable movement.

 

So I reckon if I use a bar drilled and slotted for a cable either end and pivoted in between with the following measurements I will get normal foot operation.

 

cable to pedal drilled at 35mm from pivot and cable to carbs drilled at 11mm from pivot. I work this out to give approx 60 degrees of movement about the pivot point so wouldnt need to have a curved face for cable to run in, just a well slotted bar?

 

 

Spot on, although ratio's will change as the bar moves if you don't use one with a curved face, but it should still be close enough. But I get arc length to be double that.

Edited January 17, 2007 by Rippthrough

[Richie-Van-GTi 71 2 Cars]

oops, error in my maths, them measurements give 114 dgrees movement which is a bit more than expected, also due to the closeness of the carb cable to the pivot the midrange may become tricky due to lack of curvature. Ive doubled the gaps up to 70 and 22, this gives 57 degree which is more what I wanted. I was thinking in terms of radians when doing my maths and looked at the wrong figures....rofl.