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The Norfolk Broads Forum / Broads Boat Owners Q & A / Rev Counter setup
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Posted By Discussion Topic: Rev Counter setup

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jimfin
Aug-06-2014 @ 9:32 AM                           Permalink
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My rev counter takes its signal from the "W" on the altenator.I know there is adjustment on the back of the rev counter to set it up. But how do I know that this is correct.
I have set my tickover at say approx 800rpm, but is there some way to check if this is correct.
What I,m trying to say is, I am setting the rev counter to my ear and it could be off!!!

donnyvron
Aug-06-2014 @ 9:43 AM                           Permalink
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Have used a digital tachometer to set ours up.

Try ebay, look for:

Automatic LCD Digital Laser Photo Tachometer Non Contact
this one £14.99 free P&P but there are others.

You put a white dot on the pulley and then point the device at it to read of the RPM.  BE CAREFUL OF THE BELTS. Then calibrate your rev counter.

Graeme

All right so what is the technical name, sharp end or pointy end?

This message was edited by donnyvron on Aug-6-14 @ 9:44 AM

rustic
Aug-06-2014 @ 9:48 AM                           Permalink
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There are instruments, optical, laser etc that are aimed at the flywheel or crankshaft sprocket that give a digital read out.

You can buy one, or chat to someone who has one.


When doing a check, draw a calibration chart, for different revs as per the measuring device,  against what yours indicates.


Hope it helps.



best regards, Richard.

A man who dares to waste one hour
of time has not discovered the value
of life.                       Charles Darwin

jimfin
Aug-06-2014 @ 10:39 AM                           Permalink
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Just the job. Thanks for pointing me in the right direction.

annville
Aug-06-2014 @ 11:37 AM                           Permalink
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Jimfin Measure dia of pulleys deduct alternator from crank pulley or dot of paint on pulleys turn engine over by hand count difference between pulleys adjust gauge to correct setting. John

LeoMagill
Aug-09-2014 @ 7:06 PM                           Permalink
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The cheapie optical tachos from the likes of ebay are the way to go, I think mine was about a tenner and a blob of tippex on the crank pullies worked a treat, I have two engines so checked one against crank then connected second tacho to same pulse input and matched it(identical alternators), much easier to synch engines now and less vibrations.
For anyone fitting a tacho to an alternator without tacho output it's quite easy to open up most alternators and solder an extra wire at the winding side of one of the diodes and use that for the tacho signal.

http://www.leomagill.co.uk
Formerly df.


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