69 Tach and HEI - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 7 (permalink) Old Dec 6th, 02, 11:52 AM Thread Starter
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Paul
 
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My tach works fine until about 5000 RPM then it gets all squirly(technical term). I can tell that the engine is revving higher, but the tach just bounces around.....Any suggestions?

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post #2 of 7 (permalink) Old Dec 6th, 02, 12:10 PM
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probably that 'rare' ...388 block of yours Paul,

click

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post #3 of 7 (permalink) Old Dec 6th, 02, 12:32 PM Thread Starter
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Paul
 
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LOL click!!

The rare 388 block is in a crate, this is the new 383 motor....

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post #4 of 7 (permalink) Old Dec 6th, 02, 12:42 PM
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Maybe a little spark scatter causing the tach to act up?

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post #5 of 7 (permalink) Old Dec 6th, 02, 01:40 PM Thread Starter
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"Spark Scatter"?? I've never heard that term before.

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post #6 of 7 (permalink) Old Dec 6th, 02, 01:49 PM
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He's referring to the secondary (high) voltage from the coil leaking into the primary side. If you're using an external coil take a points type condensor and hook the lead up to the positive side of the coil and ground the condensor housing. There are also tach filters available.

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post #7 of 7 (permalink) Old Dec 6th, 02, 02:59 PM Thread Starter
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Paul
 
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Thanks for the explanation.....I'm a little slow, but I eventually catch on!

I am running a large body HEI with the coil in the cap.

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