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jan.mevis(at)informavia.b
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 Posted: Wed Jun 03, 2015 8:14 pm Post subject: Engine roughness, as in stops. starts. stops. starts. |
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Thanks Frank,
I have an MSD-ignition in stead of the right mag on my Yak 50. (Mark
Bitterlich's idea).
Since then, I measure substantially higher CHT on all cylinders so better
combustion.
On the primary the blaster coil gets several HUNDREDS of volts from the
electronics.
But also it draws at least 10 amp from the electrical installation (I
busted a 10 amp B&C + regulator).
A few years ago, I tried this as an alternative for the failing coils.
It works very well, but the installation is not so easy.
For instance you do need powerful and aviation-quality 24 to 12 DC-DC
converter.
Jan
On 04/06/15 05:53, "Frank Stelwagon" <pfstelwagon(at)earthlink.net> wrote:
[quote]
<pfstelwagon(at)earthlink.net>
As an aside, in racing for years the magneto of choice was the Vertex
which
had the coil internal. When Mallory came out with their magnetos they
used
an external coil. Eventually Vertex went to the external coil. The MSD
magnetos used in top fuel racing use external coils and they are
extremely
high output. Just for what it is worth.
Frank
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JL2A
Joined: 07 Apr 2015
Posts: 113
Location: Australia
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| Posted: Thu Jun 04, 2015 2:13 am Post subject: Re: Engine roughness, as in stops. starts. stops. sta |
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| Quote: | | Since then, I measure substantially higher CHT on all cylinders so better combustion. |
Careful! I would have thought having substantially higher CHTs after changing the ignition system would indicate you've got the timing wrong. A normally set up factory system is going to light most of the fuel/air, a stronger spark might help light a little more especially if very lean of peak, but a spark is a spark, and we've got two per jug in these.
High CHTs are NOT an indicator of 'better' combustion! Unless you mean before your engine didn't run and now it does! 
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mark.bitterlich(at)navy.m
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| Posted: Thu Jun 04, 2015 8:53 am Post subject: Engine roughness, as in stops. starts. stops. starts. |
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It's nice to hear about someone else with Vertex mag experience! I never ran the MSD mags.
Mark
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