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Optimizing the Throttle Linkage

March 9, 2012 | Troubleshooting & Repair

By David Jones

I find that the link behind the fan shroud is a good place to start. This would be pushrod #6 connected to bellcrank #5 in the drawing (shown below). Disconnect both carb downlinks before starting.

Make this rod as long as is sensible with the ball connector for the pull rod down to the trans bellcrank as high as possible without fouling any other component.

Now look at the connection at the trans bellcrank end of this pull rod #4 and make sure it is aligned with the connection on the bellcrank such that they are almost in line with each other. You may have to lengthen or shorten this rod to make it align and it is also possible that it is the wrong one if it seems impossible to align as Porsche made about 4 different lengths for different models.

Once pullrod #4 is set the bellcrank #3 should be positioned such that the arm that attaches to the pull rod from the pedal linkage is at about 10 to 15 degrees before the vertical allowing a decent arc of movement through the vertical position before full throttle is attained.

One can now connect the throttle pedal to throttle bellcrank link and position the pedal angle to ones preference.

Now back to the rear of the car and connect the two downlinks so there is no lost movement and neither one is in tension when connected to the ball fasteners.

Have an assistant press the throttle pedal while observing the carb throttle openings and ensure full throttle is reached. I have found that it is possible to do this on ones own by using a broomstick through the drivers side window pushing on the throttle pedal. Once full throttle is established adjust the throttle stop at full throttle then test drive to make sure all is correct.

3 Comments

Profile missing thumb
James Dodds
April 25, 2012 at 11:20 PM
is there a picture of the linkage to bellcrank fan shroud to pull rod ? I'm trying to figure out what I'm missing. I bought a car from someone who has since died and the car was in ten boxes. Even the wiring was cut out of the car and I had to repair it and figure out how it went back in the car,victory! It took alot of looking at pictures on the internet. please help with linkage if you can. Thanks ,James Dodds in jupiter fl.
Profile missing thumb
James Dodds
April 25, 2012 at 11:20 PM
is there a picture of the linkage to bellcrank fan shroud to pull rod ? I'm trying to figure out what I'm missing. I bought a car from someone who has since died and the car was in ten boxes. Even the wiring was cut out of the car and I had to repair it and figure out how it went back in the car,victory! It took alot of looking at pictures on the internet. please help with linkage if you can. Thanks ,James Dodds in jupiter fl.
Profile missing thumb
Charles H Jacobus
July 01, 2017 at 3:40 PM
What's the best way to get the slop out of the connectors?