Today's Message Index:
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1. 02:19 PM - Re: Mag timing HS6A is the book wrong? (JL2A)
2. 03:43 PM - Re: Re: Mag timing HS6A is the book wrong? (Walter Lannon)
3. 05:00 PM - Re: Re: Mag timing HS6A is the book wrong? (John B)
4. 06:03 PM - Magneto failure CD-5 (glipaz)
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| Subject: | Re: Mag timing HS6A is the book wrong? |
No disrespect taken. Just thought there was more to it than either myself or Matt
had figured.
9 cylinders, 720d rotation of rotor to fire them all
98=1.125
thanks CP!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470770#470770
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| Subject: | Re: Mag timing HS6A is the book wrong? |
Thank you;
Yes, 9 cyls., 720* Crankshaft rotation, 810* Mag. drive rotation. If it
were a standard 4 lobe rotor that also would turn 810* but it is a
compensated 9 lobe rotor (radial engines only) that turns 360* or 0.5 X
Crankshaft (Internally geared to mag. drive)
Walt
-----Original Message-----
From: JL2A
Sent: Friday, July 07, 2017 2:16 PM
Subject: Yak-List: Re: Mag timing HS6A is the book wrong?
No disrespect taken. Just thought there was more to it than either myself or
Matt had figured.
9 cylinders, 720d rotation of rotor to fire them all
98=1.125
thanks CP!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470770#470770
---
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Message 3
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| Subject: | Re: Mag timing HS6A is the book wrong? |
Timing issues...
Gentlemen, would it be possible to condense this tribal knowledge into a
manual that applies to both the CJ and Yak aircraft?
Step-by-step, using various methods?
John B
On Fri, Jul 7, 2017 at 4:16 PM, JL2A <info@flyingwarbirds.com.au> wrote:
>
> No disrespect taken. Just thought there was more to it than either myself
> or Matt had figured.
>
> 9 cylinders, 720d rotation of rotor to fire them all
>
> 9=C3=B78=1.125
>
> thanks CP!
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=470770#470770
>
>
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Message 4
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| Subject: | Magneto failure CD-5 |
Conundrum:
At runup, Mag 2 failed (engine turned off). Engine ran smoothly on Mag 1. Returned
to chocks and opened Mag 2 to discover a broken points spring. Obvious
hard break. Replaced points and opened Mag 1 to inspect. Discovered that
the rotor on Mag 1 was completely loose (all three bolts were loose). Tightened
rotor on Mag 1, closed both mags and fired it up. Started easily. Mag
2 now worked fine but now Mag 1 failed. What?!
Thought it might be a switch problem. Tested Mag switch to make sure it was not
a wiring short to ground and it checked ok. Back to the Mag.
Inspected rotor and cap. Ok. Checked points. Open fine. Replaced cigarette.
Still wouldn't fire. Replaced coil. Still wouldn't fire. Finally replaced
Mag. Motor fired and tested fine on both mags. Runup Mag check normal.
Note: we turned the bad Mag 1 by hand and could not get a spark out of the cigarette
and the Mag turned fairly freely, without the normal flopping that the magnets
provide.
The mystery is this: assuming Mag 1 was fine and Mag 2 had a hard break prior
to shutdown (prior Mag checks on Mag 1 were fine) how did it fail after tightening
down the rotor? Why is it now producing no spark and seems to have lost
its magnetism? Prior to this both Mags worked fine on previous runups and flights.
Gil Lipaz
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=470780#470780
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