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Rotax tacho

 
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europa(at)pstewart.f2s.co
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PostPosted: Mon May 18, 2009 12:53 pm    Post subject: Rotax tacho Reply with quote
Some time ago I posted a query about the nonsense readings of our Rotax tacho.
Have now got the TCU rpm output to compare. When idle (TCU about 1500rpm) rotax
tacho not too far off (about 1700). When engine running at 2500 according to the
TCU Rotax tach reads >4500! Any thoughts as to if this suggests a duff tach or
a duff signal from the coils?

Regards

Paul
G-GIDY

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Brian Davies



Joined: 10 Jan 2006
Posts: 124
Location: uk
PostPosted: Mon May 18, 2009 2:10 pm    Post subject: Rotax tacho Reply with quote
Hi Paul,

I have had two tachos exhibit this fault ( on different aircraft) and in
both cases the fault was fixed by changing the tacho.

Regards

Brian Davies

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ptag.dev(at)tiscali.co.uk
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PostPosted: Mon May 18, 2009 8:39 pm    Post subject: Rotax tacho Reply with quote
Hi! Paul
Don't ask me why or what but it sounds like you have the tacho connected
to the wrong place which doubles the speed recorded.
I have read other postings on this.
Regards
Bob Harrison G-PTAG

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pr(at)dcanderson.myzen.co
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PostPosted: Tue May 19, 2009 12:22 am    Post subject: Rotax tacho Reply with quote
Paul,
Rotax produce a guide to tacho problems which is available on line.
One of the solutions suggested is to solder a 100 or 200 ohm resistor across
the trigger coil terminals.
Fitting a 100 ohm resistor has proved to be effective in stopping
fluctuations above 5200 rpm for me.
Roger Anderson G-BXTD

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europa(at)pstewart.f2s.co
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PostPosted: Mon May 25, 2009 12:14 pm    Post subject: Rotax tacho Reply with quote
Many thanks to those who replied re Rotax tacho - 200 ohm resister worked a
treat. Just put it across the terminals of the tacho rather than the coils as
pictured in the Rotax owners 'fix' document. Do believe we may be running short
of jobs to do.

Regards

Paul
G-GIDY

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mp.gamble(at)tiscali.co.u
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PostPosted: Tue May 26, 2009 12:20 pm    Post subject: Rotax tacho Reply with quote
2 different coloured wires leave the engine to connect with the tacho gauge. Does it matter which goes where? The rotax manual doesn't mention it.
Thanks
Mike Gamble
xs mono
[quote][b]

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