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Accelerator cable spring??

 
Old 12-12-2018, 08:27 AM
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merchauser
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Default Accelerator cable spring??

have tried to get some info on this spring in another thread about the pedal with no luck; thought I would try a different approach.



matt968 explained in the other thread, that this spring is compressed when the accelerator pedal presses down on the kick down switch on auto cars.
but, what is the function of this spring on 5 speed cars?

and why would this spring ever compress, since it is part of the outer sheathing? I would assume that the spring will only compress if the inner cable is beyond its limit,
and then causes the outer cable to buckle? there is only one part number, for the cable, so no difference between auto and manual cars. maybe this spring has no
purpose on manual cars?
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Old 12-12-2018, 04:00 PM
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Additional compensation to overcome the despair of having to drive a sh**box manual.
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Old 12-12-2018, 04:51 PM
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^^^^^Roger, let us all know what stand up club you're performing at this weekend. lol
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Old 12-12-2018, 08:08 PM
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Rob Edwards
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Isn't the spring present on the autotragic's "accelerator" cable as well?

Total WAG- the spring damps engine vibration being transmitted to the gas pedal (?)
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Old 12-13-2018, 05:25 PM
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Educated speculation:

The spring is there so that the cable can be adjusted tight to give a firm full throttle opening with pedal down. Without the spring, the possible excess travel at the pedal would be stretching cable cores and bending or otherwise damaging cables, pivots, rollers, or throttle arms. Consider it a "safety feature" to protect the cable and linkage from excess travel.
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Old 12-13-2018, 08:47 PM
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merchauser
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^^^^^dr bob, that reply is the most plausible yet! thanks. I can't see how that spring has anything to do
with the inner cable, or anything to do with the cable adjustment

anyone else care to take a stab at this??
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Old 12-13-2018, 09:04 PM
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C'mon, Dr. Bob has spoken.

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Old 12-15-2018, 07:00 PM
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It's still just speculation.

For those who have some Porsche air-cooled experience especially with carburetor cars, you know that there is a lot of variance in how the throttle is set up WRT getting the throttles all the way open at full pedal position. Many cars have throttles that don't open all the way at full pedal position, while others offer an opportunity to stretch the cable and/or bend linkage when things are set too tight. Getting the adjustment "just right" can take two people if you don't have a mechanical pedal-pusher. My guess is that the spring on the 928 cable casing is there to solve the issues exposed in the older cars.
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Old 12-17-2018, 11:06 AM
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Originally Posted by dr bob View Post
Educated speculation:

The spring is there so that the cable can be adjusted tight to give a firm full throttle opening with pedal down. Without the spring, the possible excess travel at the pedal would be stretching cable cores and bending or otherwise damaging cables, pivots, rollers, or throttle arms. Consider it a "safety feature" to protect the cable and linkage from excess travel.
This—^.

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Old 12-17-2018, 03:20 PM
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thanks dave
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