Next message: Jeff Smith: "lv-ab: News for Canadians"
Yes I agree, If the thing clamps-on, I can see how pulses could be picked up
using a peizo-electric sensor that would generate a saw-tooth spike every
time the injector pipe expands. As I understand it, there is a tee??? this
confuses me because it would upset the phasing and calibration of the fuel
into that injector, no matter how small the deflection in the measurng
device...I wait, truly interested....
By the way if you look for tinytach on google you will find what I think is
a peizo device.
Regards
Laura, Mike and Liz
http://www.seakin.com/gilana/default.htm
>From:
>To:
>Subject: Re: lv-ab: Erratic reading diesel Tiny Tach
>Date: Tue, 09 Aug 2005 10:36:47 -0400
>
>HEY i have no idea but being a multidiscipined engineer it would be easy to
>'see' the high pressure pluses in the injector lines THROUGH the injector
>pipe - as you can feel them with your fingertips - at least i can
>:-).............BUT like i said WE are assuming at the mo and we all know
>what assuming does.......:-( so waiting to hear from the user to find out
>how this is connected...
>
>regards
>
>David
>
>-----Original Message-----
>From: Mike Brasler <>
>To: ;
>Sent: Tue, 09 Aug 2005 14:09:00 +0000
>Subject: Re: lv-ab: Erratic reading diesel Tiny Tach
>
> Seen most things, worked on a lot of weird diesels , please tell how
>this injector line tacho pickup works?
>
>Regards
>Laura, Mike and Liz
>http://www.seakin.com/gilana/default.htm
>
>
> >From:
> >To:
> >Subject: Re: lv-ab: Erratic reading diesel Tiny Tach Date: Tue, 09 Aug
>2005 >08:10:49 -0400
> >
> >
> >
> >
> > TOTALLY NO NEED to conect INTO the injector line even with thick walled
> >tubes fi you hold them with your fingers you can feel the
> >pulses.....................so it prob uses some sort of sonic sensor that
> >can measure these pulses...maybe the sensor is loose on the pipe ASSUMING
> >it is not installed in the injector circuit BUT then we all know about
> >assuming things......cant see why you would need to or want to start
> >messing about with the injector circuits to meansure RPM when it is so
> >easly done externally
> >
> >maybe the poster can tell us how TT works then maybe we can assist ;-)
> >
> >regards
> >
> >David
> >
> >-----Original Message-----
> >From: Richard Goodwin <>
> >To: Mark and Beth Mowery <>;
> > Cc: Liveaboard <>; Hunter owners
>>mailling list <>
> >Sent: Mon, 8 Aug 2005 20:19:27 -0700 (PDT)
> >Subject: Re: lv-ab: Erratic reading diesel Tiny Tach
> >
> >Wow, that blew my mind at first -- "a tach transducer
> >attached to a fuel line" -- I couldn't figure out how
> >that would work, but once you mentioned "injector",
> >now I assume that the tach transducer is teed into the
> >fuel line so it picks up on the surges in pressure
> >when the injector is activated by the pump, yes?
> >
> >If that is the case, I would suspect that the tach
> >transducer has been damaged by the high pressure (my
> >engine's injectors are adjusted for 2100 lbs/sq-in).
> >
> >If the engine is running smoothly, then there isn't
> >much else it could be, other than perhaps the
> >electronics that "reads" the transducer's output and
> >turns it into RPM readings.
> >
> >It certainly could be that, but I would suspect the
> >part that is under the most stress first.
> >
> >Just a wild guess.
> >
> >Dick
> >
> >--- Mark and Beth Mowery <>
> >wrote:
> >
> > > Hi,
> > >
> > > My diesel tach is 3 years old, and recently it's
> > > been showing erratic rpm
> > > readings when the engine is running at a constant
> > > fuel setting. The
> > > readings will vary for a while, then stabilize for a
> > > while, then vary, etc.
> > > The readings will vary by quite a bit (from 700 -
> > > 2200 RPM) not the normal
> > > small variations of 10 or 20 RPM I'm used to seeing.
> > > The engine is a 2 cyl
> > > Yanmar with a single tach transducer attached to one
> > > of the fuel lines, and
> > > has been working flawlessly until now. I did remove
> > > the transducer, cleaned
> > > under it, and reattached it, but this didn't help. I
> > > really can't detect any
> > > change in the engine's sound or performance during
> > > these periods of strange
> > > readings, so I ask the following question:
> > >
> > > In your experience, does this most likely indicate a
> > > tach problem, or is it
> > > actually possible that I have the beginning stages
> > > of a malfunctioning
> > > injector that the tach is picking up on?
> > >
> > > Mark Mowery
> > > Owosso, MI
> > >
> > >
> > >
> > >
> >
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