Today's Message Index:
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1. 05:04 AM - Re: What Ignition to buy? (straight-n-level)
2. 06:12 AM - Re: Re: What Ignition to buy? (Kevin Horton)
3. 06:50 AM - What Ignition to buy? (Bill Judge)
4. 07:10 AM - Re: What Ignition to buy? (Sam Buchanan)
5. 07:09 PM - PMag CHT data? (J Riffel)
6. 08:13 PM - Re: PMag CHT data? (richard sipp)
Message 1
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Subject: | Re: What Ignition to buy? |
Wow,
A person could write a book on this topic. Thank you for all the insight and your
experiences with the different types of electronic ignition systems. This information
from the end user is great. I got a little info. /sensory over loaded,
but Im ok. I have been reading up more on the different ignition system web
sights also. I like how some systems offer the option of the auto spark plug
conversion. Looks like this is common with most of the systems and a good way
to go. They all seem to advance the timing. Im not really clear on why and when
with such a small rpm operation window. Is it certain throttle settings, under
take-off for more power? I do understand most of the reasoning though from
being involved with automobile repair/technology. Here it is mostly for its fuel
economy and drivability, stop and go. Thank you all, and I really appreciate
all this information to help me make an educated choice.
Sincerely,
T. Mitchell
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=240065#240065
Message 2
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Subject: | Re: What Ignition to buy? |
On 19 Apr 2009, at 08:02, straight-n-level wrote:
> A person could write a book on this topic. Thank you for all the
> insight and your experiences with the different types of electronic
> ignition systems. This information from the end user is great. I got
> a little info. /sensory over loaded, but Im ok. I have been
> reading up more on the different ignition system web sights also. I
> like how some systems offer the option of the auto spark plug
> conversion. Looks like this is common with most of the systems and a
> good way to go. They all seem to advance the timing. Im not
> really clear on why and when with such a small rpm operation window.
> Is it certain throttle settings, under take-off for more power? I do
> understand most of the reasoning though from being involved with
> automobile repair/technology. Here it is mostly for its fuel economy
> and drivability, stop and go. Thank you all, and I really appreciate
> all this information to help me make an educated choice.
At high manifold pressure, like during takeoff or climb, there is risk
of detonation if the timing is too far advanced. under these
conditions, all electronic ignition systems, E-mag/P-mag, Unison
Laser, etc will set the timing at about the same place it would be
with a mag. Thus there is probably very little, if any, advantage
from these systems at high power.
But, at lower MP, even at high rpm, like high altitude cruise, the
timing can be advanced another 20 or so degrees, with no risk of
detonation. All these other systems sense MP, and they advance the
timing as a function of MP and rpm, to achieve more power for a given
fuel flow.
--
Kevin Horton (Grounded)
RV-8 (Flight Test Phase)
Ottawa, Canada
http://www.kilohotel.com/rv8
Message 3
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Subject: | What Ignition to buy? |
As far as elelctronic ignition goes I really like the lightspeed but the mag
hole driven solutions may be mature enough to consider. I have been running
dual lightspeed from the get go. I have a friend who crosses ocean in
single engine planes, he has been running one of the mag hole brands on his
Lancair and says he likes them. With that said I have also seen a lot of
flap on various lists about them having problems:
http://www.cozybuilders.org/Emagair_Warning/
The huge advantage of the mag hole solutions is the easy install and not
worrying about any additional wiring for power and sensors. Lightspeed
requires sensors to be mounted either on the front of the engine or in one
mag hole and it also derives power from your electrical system so the
install is a bit more involved especially if you go with dual electronic
ignition since then you need a second battery.
So, in summation if I was shopping around for ignition I'd give the emag and
pmag solutions a good look. By look I mean talking to guys who run the
system rather than guys selling it!
There are even some others that "overlay" your mag system, one of those
makes sparks continually through like 30 degrees crank rotation but I don't
know anything about them other than thinking that they sound like the worst
of both worlds: heavy failure prone mags with vagaries of a new system. the
30 degree thing sounds like snake oil too.
The reason to go to electronic would be getting away from the 4-700 hr MTBF
of mags. Getting away from expensive plugs, 10% better economy, ease of
running lean of peak, and easy starting from a hot spark is nice too. The
overlay solutions are non starters since you don't get rid of the least
reliable part of your engine.
Bill Judge
N84WJ, RV-8 350 hrs
Message 4
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Subject: | Re: What Ignition to buy? |
Bill Judge wrote:
> There are even some others that "overlay" your mag system, one of those
> makes sparks continually through like 30 degrees crank rotation but I don't
> know anything about them other than thinking that they sound like the worst
> of both worlds: heavy failure prone mags with vagaries of a new system. the
> 30 degree thing sounds like snake oil too.
>
> The reason to go to electronic would be getting away from the 4-700 hr MTBF
> of mags. Getting away from expensive plugs, 10% better economy, ease of
> running lean of peak, and easy starting from a hot spark is nice too. The
> overlay solutions are non starters since you don't get rid of the least
> reliable part of your engine.
I find the "overlay" idea to be an intriguing option. One is the G3i system:
http://www.g3ignition.com/index.html
It is based on the MSD ignition module which has a field history of at
least a couple of decades in the high performance car and boat
communities. Spreading the spark out over many degrees of crank rotation
is a major feature of the MSD and well-proven. I like how you get the
advantages of a solid-state ignition along with automatic and complete
magneto backup if the electronic module goes off line for some reason.
Taking a peek at the internals of the mags every 500 hours isn't a major
issue for me.
Sam Buchanan
Message 5
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I'm curious what CHTs others w/ EMag/PMags are getting.
This is what I get:
MAP 23.2 RPM 2400 at 5300' and getting CHTs of 356, 394, 373, 398
with about 58 hrs on a new IO360. EGTs are 1392, 1423, 1415, 1393.
Thanks in advance.
"Jerry
Message 6
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Subject: | Re: PMag CHT data? |
Jerry:
Which RV are you flying?
Dick Sipp
----- Original Message -----
From: J Riffel
To: rv-list
Sent: Sunday, April 19, 2009 10:07 PM
Subject: RV-List: PMag CHT data?
I'm curious what CHTs others w/ EMag/PMags are getting.
This is what I get:
MAP 23.2 RPM 2400 at 5300' and getting CHTs of 356, 394, 373, 398
with about 58 hrs on a new IO360. EGTs are 1392, 1423, 1415, 1393.
Thanks in advance.
"Jerry
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