 How to repair Tach Bouncing/Dampening?, Can't find the thread |
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| Eddie914 |
 Jun 17 2010, 12:36 PM
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#1
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Unregistered  |
The tach on my 914/6 (conversion) has lost it's dampening. The tach needle is nice and steady as long as the engine rpm is constant. When the rpm changes quickly (such as when gear changes are made), the needle bounces. It takes a fews seconds to settle.
I remember reading a thread about adding a resistor to the circuitry to repair the problem. Even though a 3.2 six has been installed in the teener the engine electronics and induction are still "old school" ... 40mm Weber carbs and points, condenser & CDI ignition. The tach is an early 70's 911 model with a 7,200 rpm redline. Can anyone help me out/ Thanks Eddie |
 
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| underthetire |
Jun 17 2010, 02:43 PM
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#2
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914 Guru  Group: Members Posts: 5,062 Joined: 7-October 08 From: Brentwood Member No.: 9,623 Region Association: Northern California |
Now I remember, the resistor was kind of a fake out to run V8's and use the stock tach. The bouncing problem was a dried up I think 1UF capacitor inside the tach. Thats bouncing during RPM changes. Bouncing tach all the time was points/or alternator/or VR going bad.
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Posts in this topic
Eddie914 How to repair Tach Bouncing/Dampening? Jun 17 2010, 12:36 PM
detoxcowboy http://nhspeedometer.com/914/1.htm
North Hollywo... Jun 17 2010, 01:40 PM underthetire I remember that too. It was a capacitor though,not... Jun 17 2010, 02:35 PM dr914@autoatlanta.com If it has lost it suddenly but worked before it ... Jun 17 2010, 03:01 PM Michael N I think this is the link. Bouncing Tachometer Link... Jun 17 2010, 08:28 PM
Eddie914 Thank you everyone!
You are the best!
Ed... Jun 18 2010, 09:23 AM |
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