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> Accelerator cable not translating pedal movement to carb action
Tdskip
post Aug 24 2024, 12:31 PM
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Hope everybody is having a good weekend and thanks in advance for any thoughts or suggestions.

I have it should be an easy problem to solve that I haven’t solved – I believe the accelerator cable that came in this project is simply too long because when the gas pedal is pressed the cable flexes to a point where the physical motion from the gas pedal doesn’t translate to the same pull on the carb linkage. In other words, the cable moves around enough that it doesn’t effectively pull the carburetor linkage to increase power.

I have a replacement cable, but before I go through that I wanted to ask to see if there’s something that maybe other people encountered or that comes to mind that I’m missing.

Cable has the red arrows pointing to it.

Thanks!

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76-914
post Aug 24 2024, 03:12 PM
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I would strap the cable down so it cannot flop around. Next I would clamp the cable with some vice grips at the point it exits the sheath. If your pedal moves any after that then something wonky is going on with the cable or the conduit it resides in. (IMG:style_emoticons/default/beerchug.gif)
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burton73
post Aug 24 2024, 03:23 PM
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I would like to see the end where it connects to the linkage. My guess is it is too long.
I think you can a new end on the cable and solder it on or crimp, not sure but look for cable ends. The picture shown a cable that it looks like there is an adjustment. What does you connection point look like. Not my car shown

Best Bob B


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Tdskip
post Aug 24 2024, 05:03 PM
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Thanks for the response.

Let me try better restricting movement @76-914 , thanks

Good idea to double check but as of right now the fitting at the carb linkage is right and doesn’t have any slop. I will triple check. Thanks @burton73
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cgnj
post Aug 24 2024, 06:57 PM
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When I was using a hex bar linkage, I mounted the carbs so that the bar was closer to the flywheel.
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bkrantz
post Aug 24 2024, 07:46 PM
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If the engine compartment cable housing is in good shape, and fully seated at both ends, then even if it swings a bit the motion of the inner cable should transmit from one end to the other. Another place that movement can get lost is in the tunnel. If the rigid tubing for the throttle cable has detached from the tunnel, then some or all of the pedal motion and cable movement will be lost.
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Spoke
post Aug 24 2024, 07:49 PM
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Something doesn't seem right. If both ends of the sheath are stable, the pulling of the cable at one end should be the same at the other end. But if one side of the sheath is loose, then moving the accelerator peddle wouldn't produce the same movement at the engine.

Check in the tunnel for proper connections and that the sheath is stable at both ends.
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SirAndy
post Aug 24 2024, 11:18 PM
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QUOTE(Spoke @ Aug 24 2024, 06:49 PM) *

Something doesn't seem right. If both ends of the sheath are stable, the pulling of the cable at one end should be the same at the other end. But if one side of the sheath is loose, then moving the accelerator peddle wouldn't produce the same movement at the engine.

Check in the tunnel for proper connections and that the sheath is stable at both ends.

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Tdskip
post Aug 25 2024, 06:56 AM
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Thanks for all the ideas and suggestions.

Very much appreciated.
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VaccaRabite
post Aug 26 2024, 06:15 AM
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Spoke nailed it.
As long as the sheath is locked into place, and the cable is attached at the pedal and the throttle arm - the cable will actuate and length does not matter at all.

If there is slack between the throttle arm and the sheath clamp - that will kill you. You may need to fabricate a clamp that is further back to get the spacing right. There should be ZERO slack between the throttle arm and the sheath clamp. Any slack there means loss of travel when the gas pedal is pushed, as well as loss of throttle response.

Zach
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Tdskip
post Oct 10 2024, 05:34 PM
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You guys nailed it - thanks.

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914werke
post Oct 10 2024, 06:01 PM
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SirAndy
post Oct 11 2024, 09:27 AM
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QUOTE(Tdskip @ Oct 10 2024, 04:34 PM) *
You guys nailed it - thanks.
Can you shoot another picture of that area but zoomed out a bit?

I see all sort of wrong there ...
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Tdskip
post Oct 11 2024, 10:00 AM
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@SirAndy 2 here you go. Hope it had been a good week, thanks for the eyes on this.

One of those cables is for an amplifier for the stereo.

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Tdskip
post Oct 11 2024, 11:08 AM
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Oh geez - did the PO route the throttle cable through the wrong opening? It should be near the larger speedometer fitting, right?

Should be like circled in red, correct?

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NARP74
post Oct 11 2024, 12:07 PM
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Fuel line replacement is in your near future.
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SirAndy
post Oct 11 2024, 12:37 PM
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QUOTE(Tdskip @ Oct 11 2024, 10:08 AM) *
Oh geez - did the PO route the throttle cable through the wrong opening?

Well, yes, they did. For starters, it isn't supposed to go up and through the hole for the rubber snorkel. In fact, you can see that they had to remove the snorkel top from the hole to make space for the cable (and amp wire).
No wonder it broke, trying to make a 90 degree bend right there.
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930cabman
post Oct 11 2024, 01:10 PM
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QUOTE(NARP74 @ Oct 11 2024, 12:07 PM) *

Fuel line replacement is in your near future.


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Good catch, sooner rather than later
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Tdskip
post Oct 13 2024, 08:49 AM
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Thank you gentlemen, appreciate the reply’s
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