[ROVERNET - UK] tachometer

Paul Smith Paul.Smith at auroraenergy.com.au
Fri Oct 29 03:28:37 BST 2004

3000rpm = 6000 ign pulses/minute for a 4 cylinder 4 stroke = 100 ign
pulses/second = 100Hz
by my calculation.


-----Original Message-----
From: Ron Morey [mailto:morey814 at hotmail.com]
Sent: Friday, 29 October 2004 1:07 pm
To: rovernet at lyris.ccdata.com
Subject: RE: [ROVERNET - UK] tachometer

Larry, as already stated the loop is the ignition pickup and is in series 
with the coil and points. (Lo tension side) The tach is very simple. If it 
will not spring to life with a tap then there are a few internals that will 
likely be bad due to age. I apologize to all others who are also old-not 
necessarily bad, just close to failure. If I remember correctly there are 
two transistors, a diode or two and several capacitors enclosed in the tach.

The transistors and diodes can be checked easliy by an electronics tech-do 
you have any friends? If these test good and maybe just as a good precaution

change the capacitors. They are cheap and cannot be counted on to last more 
than 20years. They often do but often don't also. The tach will have to be 
calibrated afterwards. Again if you have a techy friend they will be able to

calibrate it. (a signal of 12000Hz would be needed to set the tach to 
3000Rpm.) If not then drive down the highway in 4th and approximate the 
setting by Mph. (22Mph/1000 Rpm. Hope this helps, Ron.

>From: "Larry" <lewill at ctcweb.net>
>Reply-To: rovernet at lyris.ccdata.com
>To: <rovernet at lyris.ccdata.com>
>Subject: [ROVERNET - UK] tachometer
>Date: Thu, 28 Oct 2004 07:53:20 -0600
>The tach stopped working on my P6. Does anyone have a schematic of the
>wiring for this tach. On the back there are five wires. One goes to ground.
>One goes to the light. One is a hot wire. Two are hooked up to the 
>loop? And these two have power to them when the key  is on but the engine 
>not running. Could this be the problem? Tached out. Larry
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