Tracy Crook wrote:

Can't comment on the operating characteristics of the enlarged

trailing

sparkplug hole (I haven't flown this configuration) but the last

statement

is totally bogus.

At around 500 hours, I had an in-flight failure of the leading spark

caused

by the opening of the leading coil ballast resistor.  The only

evidence that

this occured was an increase in EGT of about 30 degrees F.   I noted

this

during an instrument scan but saw no significant loss of power.  I

continued

my flight to the scheduled destination about 85 miles away from the

point

where the failure occured.

The leading spark failure was not discovered until the following day

during

preflight checks when I disable both coils (one at a time).  The

engine

stopped when the trailing coil module was disabled.

I do use a modified trailing coil ignition timing (same as the

leading

timing instead of 15 degrees retarded) which prevents a large loss

of power.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

Trailing or leading coil module?
Royce

Don't understand the question Royce.  The advanced ignition timing on the
trailing coil prevents a large loss of timing in the event of leading plug
ignition, if that's what you were asking.

Tracy

 
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