My Great Plains 2180 VW has single ignition from a Compufire unit. I use
automotive spark plugs and high voltage un-shielded automotive spark wires.
The Compufire ignition is rated at 40,000 volts; most magnetos run 15,000 to
20,000 volts. The Compufire will fire the ignition at 0 RPM; just move the
prop to the 0-degree point and the unit will fire. Starting is set for
0-degree advance and ramps up to 30-degree advance at WOT. Advance comes
from the base of the VW distributor. The Compufire uses the "waste fire
system", so a high voltage rotor and distributor is not used. My spark plug
gaps are set at 0.050" per the Compufire recommendation. The Compufire uses
0.6 amps at idle and ramps up to 2.6 amps at WOT. Three sources of 12-volt
power are engine driven alternator, 17-amp-hour main battery and 7-amp-hour
back up battery; transition from each power source is automatic using the
PS-2 power control panel. Steve Bennett told me not to use shielded
aircraft ignition harness because the insulation would not hold up to the
40,000 volts from the Compufire.
I put a large ferrite core at the 12-volt power input and another large
ferrite core at the ground return lead on the Compufire unit. I put 2 loops
of the wires through each ferrite core. I have no ignition noise on the
radio, either transmit or receive, at idle, cruise or WOT. Works good for
me. Your results may vary.
Tri-gear KR-2 N6242
California< MD, USA
I bought the new heads for my Revmaster 2100D engine with the automotive
plugs. My engine has the D3000 mags and I need to convert it to auto plug
wires. I have searched through the archives and have seen some
recommendations about the GP shielded spark plug adaptors. Is this the best
way to go or does anyone else have a different route?
Luis R Claudio, Dallas, Texas?
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