From: Sky2high@aol.com
Message-ID: <aa.61624e0.2992b293@aol.com>
Date: Wed, 6 Feb 2002 11:23:47 EST
Subject: Re: Electronic ignition
To: lancair.list@olsusa.com
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Reply-To: lancair.list@olsusa.com

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Ian,

Your calculations are not wrong (Q#1).  The choice of any system requires the 
balancing of compromises to finally satisfy your confidence level, overall 
costs, installation and operational simplicity, etc.

I have two friends that use pure dual electronic ignitions and I can relate 
some of their experiences -- none of which were particularly "puckering" 
(Q#2).  Neither has a backup battery or alternator.  One uses auto plugs 
which appear to work well.  One uses the mag locations to drive crankshaft 
position sensors and fires all top plugs from one "side" and the bottom plugs 
from the other side (making cylinder related problem diagnosis very easy).  
The other uses a Hall effect crank sensor.  Both type of position sensors 
have had minor problems.  Both have had ignition wire problems.  One is 
considering adding the backup-battery system and the other is considering 
adding the B&C secondary alternator.

The Unison Lasar system 
(http://www.unisonindustries.com/products/ignition.html) (Q#3) has satisfied 
all of my requirements:

1.  Results that warrant cost:  Quick starts (hot or cold), increased power 
(noted by sprightly takeoff run, energetic climbs, improved cruise) and 
improved fuel usage.

2.  Backup/Confidence:  Simply reverts to familiar magneto operation if there 
is any failure in the electronic system, including loss of electrical power.  
Mags are checked before flight in the usual fashion.  A panel light indicates 
backup magnetos are operating.

3.  Installation simplicity: Replace mags (kept original harness and plugs), 
mount controller box, wire panel light and power, connect to manifold 
pressure, time mags, start engine and go (after making log book entry).

Scott Krueger
N92EX


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