Bouncing Speedo - Team Camaro Tech
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post #1 of 2 (permalink) Old Oct 22nd, 14, 12:35 PM Thread Starter
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Dave
 
Join Date: Jun 2006
Location: Vacaville CA
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Bouncing Speedo

The needle in my '69 bounces around at speeds below 40 mph. I have replaced the cable twice and replaced the speedo head twice. Nothing I've done so far has made it any better. The cable is routed thru the Muncie hole behind the behind the distributor.

I'm looking for ideas.

What app or apps was the 90 degree adapter used at the tailshaft.

The driven gear at the tranny has also been replaced.

Any good ideas. This will be a winter project.

Thanks Dave

Dave

Known to run with scissors....
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1969 Camaro Z/28 "clone", GMPP ZZ383, Autogear M22W, Moser 12bolt w/TruTrac 3:73.
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post #2 of 2 (permalink) Old Oct 22nd, 14, 05:00 PM
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John
 
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Location: Moraga,Ca.,USA
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Re: Bouncing Speedo

The 90 Degree adapters were quite common on the trucks in both 2X4 and 4X4 models from the 70's until the 'electro' units came into use.
Some GM models, like Pontiac/Cad./Olds used them often.
They were also used on Jeeps and other vehicles over the years.
Summit actually carries them and they are usually under @$70~80 for good ones.

I normally find the either the cable being 'short-turned' or kinked or the speedo head cup dragging to be the most common cause of "bounce" - but you've changed the cable so the only thing in that list is routing, or a 'short-turn' cause.
The tighter the turn the more the inner cable tries to 'spring' while turning as it drags and then releases.
Lack of proper lube type and amount can lead to a 'dry' cable, specially where there are high heat sources in the area it is routed. I use a tube of GM Speedo Cable lube on mine and those I service for others. Any good lube that resists water and doesn't mind a little heat is fine.

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