Has anyone did a straight and level and switched off the trailing

ignition.

What was the rpm loss and speed? I'd like to know on take off as well,

but I

would'nt ask anyone to do that! Anyhow I have an idea. Thanks Skip

Done it many times.  Very little rpm loss (less than mag drop on a Lyc) with
loss of trailing spark. (The EC2 has a leading /trailing coil disable switch
to test both before takeoff).  With Mazda's timing there is a big loss of
power when the leading spark goes away.  This is why I run almost the same
timing on trailing as leading.  This way the drop is about the same as mag
drop on a Lyc.  EGT goes up about 75  degrees when loosing Lead spark.

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

Sounds like evidence that  the unburned fuel in the exhaust is a major factor
in the extra exhaust heat.

Paul Lamar
 
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