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I am desperately trying to get the single rotor
running in the airplane. The engine on the test stand is just humming
away, and when I tried the one in the airplane a couple of weeks ago it did not
do anything.
No ignition!!! cranking too slow???
starter cable too long??? CAS signal too weak???
The ignition fired when I took the
plugs out of the rotor housing, but not when they were in the housing. The
crank speed difference is 240 vs 320 RPM. The engine on the test stand is
already so free that it does crank about 360RPM. Solution? Making a larger
diameter trigger wheel to make up for the slower crank speed. Turned out to make
no difference. What is going on?????.
My ignition system is a MSD Street Fire unit. At
this point, I decided to have a closer look at the trigger characteristics of
this unit. After running it on the bench with all sorts of triggers, it turns
out to require a minimum pulse repetition rate at which it is firing no
matter what voltage or wave shape of the trigger signal. On top of that, a build
in trigger indicator light works at much slower trigger signal the
coil actually fires, creating a deception when testing.
All that seem to be not a malfunction of one unit
because I have two units doing exactly the same thing.
Before I found out what is going on, I contacted
MSD by phone and was told to hook it up correctly, and if it does not fire send
it back to them. Later I sent in some more questions by email which were never
answered.
Final solution! No CDY. Using two individual coils
with a TSI igniter each. No more low speed issues.
Installation on the test stand is complete, and
will be tested in the next two days. If nothing bad happens, installation in the
airplane will be competed in a couple of days.
I hope this is not to confusing.
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