Today's Message Index:
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1. 05:58 AM - Re: Re: Tach reads perfect until 4k, then goes to 7k?? (Noel Loveys)
2. 02:49 PM - Re: Tach reads perfect until 4k, then goes to 7k?? (ricklach)
3. 10:14 PM - Re: Tach reads perfect until 4k, then goes to 7k?? (cschmokel)
Message 1
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| Subject: | Re: Tach reads perfect until 4k, then goes to 7k?? |
Not quite.
You have the right idea with the counting of the pulses but two stroke
engines is completely different than four stroke engines. The two stroke
engine will spark at the top and the bottom of the piston travel. That's
twice per revoloution. The four stroke engine is far different in that it
only sparks once every two revolutions.
Tiny Tach has two models available one for two stroke engines... and one
for four stroke.
BTW if you get a tiny tach, I used one on my 582 UL with great success, be
sure to wrap both plug leads going to any cylinder. That will insure the
tach doesn't blank out when you shut off either mag.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of cschmokel
Sent: June 27, 2010 2:53 PM
Subject: RotaxEngines-List: Re: Tach reads perfect until 4k, then goes to
7k??
Brian,
Thanks, I found the service bulletin. Not sure which tach I've got, will
have to check Monday. I don't recall seeing a resistor on the stator the
last time I tore the engine apart, so I'm thinking it's the "new" type with
the integrated resistor. Which makes me think the tach is broken ..
Noel,
I checked out the tiny tach website .. it looks like all these little guys
do is count ignition pulses, and the number of pulses/rev can be programmed.
Seems to me any one of them would work .. right?
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302705#302705
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| Subject: | Re: Tach reads perfect until 4k, then goes to 7k?? |
Carl and Brian,
Ive been working with the same problem as Carl. My Rotax rev-counter is solid until
it reaches 4800-5000 then it goes to 7000, like Carls. Ive been searching
through all the SBs, SIs, SAs and SLs and I only found Service Instruction SI-13-1996
R2 that refers to installing a tack. But I find no reference to a resister
across any terminals in this document. Have I missed it or is there another
document youre referring to? Also Brian what two terminals are you putting
the resister across? Service Instruction SI-13-1996 R2 has six installation configurations.
Im like most people Fig. 3 is my installation, the simple one.
All other FIG are for a Rotax Fly-Dat or a 914 with a TCU.
After review all the Schematics in the 912 Installation Manual and the Heavy Maintenance
Manual all schematics showed a simple direct connection, without a ground,
between the tack #2 - terminal and the rev pick up. I tried that and the
tack did not work at all. I then replaced the ground between the tack #2 - terminal
as shown in Fig. 3 of SI-13-1996 R2 and Im now back in the same spot,
straight to 7000 from 5000 so not pass go and do not collect $200.
Any thoughts.
Rick
--------
701Driver
N35 26.700, W118 16.743
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302890#302890
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| Subject: | Re: Tach reads perfect until 4k, then goes to 7k?? |
Noel,
The TT2A Tiny Tach can be set for 1 spark / 2 revs. Hopefully, it'll do the trick.
Rick,
Glad to know I'm not the only one! What's odd is this whole nuttiness started
after replacing my sprag clutch. Oh well. I'll let you know if the TT2A works.
Kernville, CA .. I used to go there as a kid .. paradise!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=302950#302950
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