|The MGA With An Attitude
Accelerator PEDAL POSITION - CB-114
At 11:14 AM 7/2/2009 -0600, Bill in NC wrote:
>My accelerator pedal places my foot in a very uncomfortable position, almost bent backward. Can this be fixed by adjusting the pedal to give a more comfortable driving position"?
It might be adjusted a little, but not much. Note there should be a supplimentary return spring attached to the throttle arm in this same location. This spring (along with associated bulkhead bracket and change of trunnion) was used commencing with car number 24594. Illustrations taken from the Service Parts Lists (click for larger images) are not entirely correct, but 1600 shows the correct spring bracket, and Twin Cam shows the correct trunnion with extended outboard end to accept the spring.
The normal setup is to set the engine idle speed first, so the rest position of the idle arms is correct before you fiddle with the cable. Then pull the cable all the way out at the carb and, and attach it to the throttle arm with minimum slack in the cable This makes the pedal all the way up, high as it can go, with the pedal output arm above right side passengers feet bumping against the bulkhead.
Then remove air cleaners and block the air floats up so you can observe the throttle plates. Have a friend press the pedal down with fingers only until the throttle plates are wide open and hit the open stops. Look at the pedal in this position. It should be a little short of hitting the floor. There should be an adjustable pedal stop on the floor underneath the pedal. Loosen the bolt and bring the stop up against the bottom of the pedal when the throttle is full open, and tighten the bolt in that position. The pedal stop keeps the driver from mashing the pedal too far down and stretching the cable or breaking something with too much force.
Normally that's all you do to adjust the pedal, so the upper limit is generally as high as it can go. However, you can tinker a little. If the pedal stop was a full inch above the carpet you could bend something in the pedal parts like twist the cross shaft for instance, to make the pedal lie closer to the floor. Then repeat adjustment of the pedal stop same as noted above, and you may end up with the pedal a little bit lower. Is it worth the effort?
The only way to get full throttle operation with less pedal travel is to increase the mechanical lever ratio of the pedal to make the cable travel farther. That would be a bit of a challenge. It might be easier to make a shorter throttle input arm for the carburetor shaft. As usual, if you do anything non-standard on the car you should document it so the next person to lay hands on it (maybe even yourself later) will not be confused.