Re: Digital RPM meter.

["Richard Reyes" <llestat@ibm.net>]

4 pulses per revolution.  As to building the RPM meter you can 
get a frequency counter all in one chip from digikey electronics 
cheap 10.00$ or less.  BTW some things may be fun to build 
yourself but other things aren't really worth the trouble.  You can 
get a digital RPM gauge from JC whitney for under 40.00$.  
Furthermore the resolution you get from a digital guage really 
isn't better than 10 RPM.  A cheap way to go would be to add 
to a handheld meter a frequency to voltage converter and use 
that as a digital rpm meter.

On Fri, 7 Feb 1997 16:02:30 +0800, Lisa & Rick wrote:

>On  7 Feb 97 at 1:58, Domenic Lippolis wrote:
>
>>         I would think that off the primary you would get 1 pulse
>>         each time
>> the plug fires  and therefore each time the motor turns one
>> revolution. Because with each revolution one of the 
cylinders will
>> be firing.  I am quite positive there are no "dead turns" with 
the
>> VW 4 cylinders.
>
>Aren't you trying to say that during each revolution all 4 plugs 
will 
>fire?  Therefore, you'd get 4 pulses per revolution from the 
primary 
>or the hall sender.  So if you take it off one of those, you need 
to 
>divide by four to get one revolution. 
>
>
>
>Rick    hugacub@whidbey.net
>85 Scirocco 8V  Wolfsburg
>Oak Harbor, WA
>(On Whidbey Island in the Puget Sound)
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