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Old 11-06-2018, 07:27 AM
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Walt Walt is offline
Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,228

Originally Posted by rvbuilder2002 View Post
As has been mentioned already..... the cautions about torsional vibration are far more than lawyer speak.
It is very real. If tests haven't been done on a specific configuration, then everyone doesn't know what they don't know.

This also can not just be dealt with intuitively.
It has been suggested that keeping RPM's within the normal range will keep you safe. Not necessarily true.

It has been many years since i was involved with some of the testing, but if I am remembering correctly, the most serious RPM's were on the low end of what might be used for cruise flight (2000 - 2300) with moderate MP and advanced timing (read the original Hartzel doc. for more details).
Point being.... without testing there is no way to know what problem areas might exist.
I've had about every type of ignition out there on my old 360 with std compression, but for what its worth, my new IO-370 high compression is being delivered with 2 Bendix mags, and I'm currently not planning on changing to EI.
Walt Aronow, DFW, TX (52F)

EXP Aircraft Services LLC
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