[ROVERNET - UK] tachometer

Ron Morey morey814 at hotmail.com
Sat Oct 30 19:32:54 BST 2004


Paul. absolutely correct. My aplogies for sloppy calculatin.
Ron.
>From: Paul Smith <Paul.Smith at auroraenergy.com.au>
>Reply-To: rovernet at lyris.ccdata.com
>To: "'rovernet at lyris.ccdata.com'" <rovernet at lyris.ccdata.com>
>Subject: RE: [ROVERNET - UK] tachometer
>Date: Fri, 29 Oct 2004 13:28:37 +1100
>
>3000rpm = 6000 ign pulses/minute for a 4 cylinder 4 stroke = 100 ign
>pulses/second = 100Hz
>by my calculation.
>
>PVS
>
>-----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
> >induction
> >loop? And these two have power to them when the key  is on but the engine
> >is
> >not running. Could this be the problem? Tached out. Larry
> >
> >
> >
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