Today's Message Index:
----------------------
1. 07:23 AM - Re: Magnito/RPM strangeness. 582 problem. (Noel Loveys)
2. 07:36 AM - Re: RotaxEngines-List Digest: 1 Msgs - 01/23/09 (tacco@aol.com)
3. 11:45 AM - Re: Magnito/RPM strangeness. 582 problem. (815TL)
4. 11:59 AM - Re: Re: Magnito/RPM strangeness. 582 problem. (george may)
5. 01:19 PM - Re: Magnito/RPM strangeness. 582 problem. (815TL)
6. 01:34 PM - Re: Re: Magnito/RPM strangeness. 582 problem. (george may)
7. 03:08 PM - Re: Re: Magnito/RPM strangeness. 582 problem. (Noel Loveys)
8. 03:11 PM - Re: Re: Magnito/RPM strangeness. 582 problem. (Noel Loveys)
9. 03:33 PM - Re: Re: Magnito/RPM strangeness. 582 problem. (Noel Loveys)
Message 1
| INDEX | Back to Main INDEX |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Magnito/RPM strangeness. 582 problem. |
I'll bet you were using the Kitfox analogue tach. The pulses coming up the
grey wire are probably coming at too high a voltage on one side so all the
pulses are not counted. When you turn off the stronger side of the split
coil the voltage on the pulses drops to a point where more of the pulses get
counted and the tach then magically increases. This may be fixed by
installing a resistor in series with the tach on the grey lead. You can try
first with a decade box to get the correct resistance.
Having a tach that doesn't read correctly all the time is not good... You
may be seriously over revving your engine on takeoff or just as bad, trying
to take off without full power being developed. Those Westach devices are
notorious for their bad rep as just about the poorest tach available.
I'd recommend getting a digital tachometer like the TinyTach but be sure to
get the one specifically made for two cylinder two stroke engines. The
instructions which come with the digital tach will tell you to choose any
spark plug lead and wrap the impulse line around it a specific number of
times. I recommend wrapping the wire around both plug leads going to any
cylinder that way pulses are read from both sides of the magneto and your
digital tach won't turn off when you check one or the other mags.
I left my Westach in the panel and I use it not to identify a specific
engine rpm but to follow a trend in rpm... It's easier to notice a hand
wavering up and down than trying to follow the numbers on a digital tach.
Noel Loveys
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of 815TL
Sent: Friday, January 23, 2009 6:47 PM
Subject: RotaxEngines-List: Magnito/RPM strangeness. 582 problem.
I posted this over on the Kitfox forum, but I thought I would ask here as
well.
Hey all. My instructor and I tried to take the plane up this afternoon, so I
could get some time in, but we ran into a snag. He was not comfortable
taking it up until we get it figured out.
On run up, we would turn off one mag at a time to check them. Turning off
the left mag would indicate a drop of about 50RPM, and we could also hear it
and feel it. But when we would do the right mag, it would indicate a
500-800RPM INCREASE. Now we could feel and hear a slight drop, probably
50-100RPM, just like the left. But the indication would say a huge increase.
The last time I had the engine running, the mags worked and showed fine.
This is a Rotax 582 model 90 by the way.
Any ideas on this?
Andrew
815TL, Kitfox II, Rotax 582-C
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226438#226438
Message 2
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: RotaxEngines-List Digest: 1 Msgs - 01/23/09 |
The basics for the engine seem right (sound and feel), so I would guess that the
harness collecting the RPM data is somehow being influenced by the mag circuit.
Run you mag wires down and make sure they are? 1) shielded and 2) not run
really close to the tach wires.? Shielding the mag switch wires is really a benefit
for radio and instrumentation performance.
Good luck,
Jon Moore
Huntsville, AL
-----Original Message-----
From: RotaxEngines-List Digest Server <rotaxengines-list@matronics.com>
Sent: Sat, 24 Jan 2009 1:57 am
Subject: RotaxEngines-List Digest: 1 Msgs - 01/23/09
*
=================================================
Online Versions of Today's List Digest Archive
=================================================
Today's complete RotaxEngines-List Digest can also be found in either of the
two Web Links listed below. The .html file includes the Digest formatted
in HTML for viewing with a web browser and features Hyperlinked Indexes
and Message Navigation. The .txt file includes the plain ASCII version
of the RotaxEngines-List Digest and can be viewed with a generic text editor
such as Notepad or with a web browser.
HTML Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=html&Chapter 09-01-23&Archive=RotaxEngines
Text Version:
http://www.matronics.com/digest/digestview.php?Style=82701&View=txt&Chapter 09-01-23&Archive=RotaxEngines
===============================================
EMail Version of Today's List Digest Archive
===============================================
----------------------------------------------------------
RotaxEngines-List Digest Archive
---
Total Messages Posted Fri 01/23/09: 1
----------------------------------------------------------
Today's Message Index:
----------------------
1. 02:19 PM - Magnito/RPM strangeness. 582 problem. (815TL)
________________________________ Message 1 _____________________________________
Time: 02:19:59 PM PST US
Subject: RotaxEngines-List: Magnito/RPM strangeness. 582 problem.
From: "815TL" <lawrenceaw@corning.com>
I posted this over on the Kitfox forum, but I thought I would ask here as well.
Hey all. My instructor and I tried to take the plane up this afternoon, so I
could
get some time in, but we ran into a snag. He was not comfortable taking it
up until we get it figured out.
On run up, we would turn off one mag at a time to check them. Turning off the
left
mag would indicate a drop of about 50RPM, and we could also hear it and feel
it. But when we would do the right mag, it would indicate a 500-800RPM INCREASE.
Now we could feel and hear a slight drop, probably 50-100RPM, just like
the left. But the indication would say a huge increase.
The last time I had the engine running, the mags worked and showed fine.
This is a Rotax 582 model 90 by the way.
Any ideas on this?
Andrew
815TL, Kitfox II, Rotax 582-C
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226438#226438
Message 3
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
Thanks for the info Noel. Any clue why this might have cropped up all of the sudden.
It was not a problem in the past.
I was thinking of getting a TinyTach anyway, now is a good time for the upgrade.
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226563#226563
Message 4
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
Andrew--
A tinyTac would be a good investment. I had one on my Kitfox. You will fi
nd =2C however=2C that you will still need the analogue tac for your mag ch
eck.
george
> Subject: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
> From: lawrenceaw@corning.com
> Date: Sat=2C 24 Jan 2009 11:44:25 -0800
> To: rotaxengines-list@matronics.com
>
>
> Thanks for the info Noel. Any clue why this might have cropped up all of
the sudden. It was not a problem in the past.
>
> I was thinking of getting a TinyTach anyway=2C now is a good time for the
upgrade.
>
> Andrew
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=226563#226563
>
>
>
>
>
>
>
===========
===========
===========
===========
>
>
>
_________________________________________________________________
Hotmail=AE goes where you go. On a PC=2C on the Web=2C on your phone.
http://www.windowslive-hotmail.com/learnmore/versatility.aspx#mobile?ocid
=TXT_TAGHM_WL_HM_versatility_121208
Message 5
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
Hmm.... Does the Tinytach hook up to plug wires from both cylinders, or just one?
If it goes to both, it seems like the mag check would still work.
Probably best if I track down the problem, then get the TinyTach as a backup then.
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226571#226571
Message 6
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
TinyTac connects to one wire. The issue I believe s a digital vs analogue o
ne. I always used the Rotax tac for mag check and the tiny tac for flight.
My mag check always showing 50 rpm drop on one and 125 rpm on the other. Ha
rd to see this on the tinytac
George
> Subject: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
> From: lawrenceaw@corning.com
> Date: Sat=2C 24 Jan 2009 13:18:43 -0800
> To: rotaxengines-list@matronics.com
>
>
> Hmm.... Does the Tinytach hook up to plug wires from both cylinders=2C o
r just one? If it goes to both=2C it seems like the mag check would still
work.
>
> Probably best if I track down the problem=2C then get the TinyTach as a b
ackup then.
>
> Andrew
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=226571#226571
>
>
>
>
>
>
>
===========
===========
===========
===========
>
>
>
_________________________________________________________________
Windows Live=99: E-mail. Chat. Share. Get more ways to connect.
http://windowslive.com/explore?ocid=TXT_TAGLM_WL_t2_allup_explore_012009
Message 7
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
The reason has probably been mentioned here by others. A faulty ground is
the biggest cause of problems in Aviation electrical systems. You should
look for not only loose grounds but also any dirty or even slightly corroded
connections. In your case because the problem isn't erratic it's probably a
bit of corrosion under a nut or bolt. I wouldn't worry about a sudden
stoppage. BTW the bad connection can actually be inside the magneto ring.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of 815TL
Sent: Saturday, January 24, 2009 4:14 PM
Subject: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
Thanks for the info Noel. Any clue why this might have cropped up all of
the sudden. It was not a problem in the past.
I was thinking of getting a TinyTach anyway, now is a good time for the
upgrade.
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226563#226563
Message 8
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
Only if you don't wrap both wires going to either cylinder. Mine showed an
accurate almost consistent drop on both mags. Be careful to only make the
number of wraps recommended by TinyTach around the wires. Too many turns is
just as bad as to few.
Noel
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of george
may
Sent: Saturday, January 24, 2009 4:28 PM
Subject: RE: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
Andrew--
A tinyTac would be a good investment. I had one on my Kitfox. You will
find , however, that you will still need the analogue tac for your mag
check.
george
> Subject: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
> From: lawrenceaw@corning.com
> Date: Sat, 24 Jan 2009 11:44:25 -0800
> To: rotaxengines-list@matronics.com
>
>
> Thanks for the info Noel. Any clue why this might have cropped up all of
the sudden. It was not a problem in the past.
>
> I was thinking of getting a TinyTach anyway, now is a good time for the
upgrade.
>
> Andrew
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=226563#226563
>
>
>
>
>
>
>
>========
>
>
>
_____
HotmailR goes where you go. On a PC, on the Web, on your phone. See how.
<http://www.windowslive-hotmail.com/learnmore/versatility.aspx#mobile?ocid=T
XT_TAGHM_WL_HM_versatility_121208>
Message 9
| INDEX | Back to Main INDEX |
| PREVIOUS | Skip to PREVIOUS Message |
| NEXT | Skip to NEXT Message |
| LIST | Reply to LIST Regarding this Message |
| SENDER | Reply to SENDER Regarding this Message |
|
| Subject: | Re: Magnito/RPM strangeness. 582 problem. |
The pickup lead from the TinyTach is a shielded wire similar to a piece of
coax. There is a tail sticking out of it, about 8 inches of stiff insulated
wire. You simply wrap that tail the prescribed number of turns (i forger
but it's in the instructions)around the plug wires. There is no physical
hook up, no actual connection. After wrapping my wires I then covered the
installation with a special tape that melts into itself, just to keep things
clean. I think TinyTach recommends not cutting the pickup wire.
Noel
-----Original Message-----
From: owner-rotaxengines-list-server@matronics.com
[mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of 815TL
Sent: Saturday, January 24, 2009 5:49 PM
Subject: RotaxEngines-List: Re: Magnito/RPM strangeness. 582 problem.
Hmm.... Does the Tinytach hook up to plug wires from both cylinders, or
just one? If it goes to both, it seems like the mag check would still work.
Probably best if I track down the problem, then get the TinyTach as a backup
then.
Andrew
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=226571#226571
Other Matronics Email List Services
These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.
-- Please support this service by making your Contribution today! --
|