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1. 06:21 PM - Engine misses above 2400rpm (Shayne & Phyllis)
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Subject: | Engine misses above 2400rpm |
Wanted to share a problem I am having integrating my MGL Voyager with my
100hp Corvair engine. A couple of months ago I posted a message to the
effect that I thought I was having carb problems when I would firewall
the throttle. After spending considerable time troubleshooting the
problem of the engine missing above 2400rpm, I discovered that if we
removed the wire connecting the open points ignition coil to the RDAC
rpm counter wire connection, the problem went away. The engine runs
fine connected to the electronic ignition system with its ignition coil
connected to the RDAC. Please note that the 2 ignition systems are each
equipped with their separate diode and joined to a common wire through a
fuse to the RDAC. MGL has been very cooperative and concerned about
what is happening but they are unable to explain why the engine is
disrupted on the open points system. I am sure that they deal with
aviation engines but have little experience with our automotive Corvair
engine. As an alternative, at their suggestion, we have connected the
RDAC to the alternator output wiring. We are getting an rpm output and
we have been adjusting the pulses, but the readings are unreliable and
fluctuate. Maybe somewhere out there someone has experience with this
situation and can explain what is happening. Also, if someone is
intending to hook their Corvair engine up to MGL or Dynon, they need to
be aware of the potential problem that we have been experiencing. We
flew our plane for the first time to Oshkosh last year and thought that
we were experiencing carb ice. We now believe that we were experiencing
carb ice, but we were also having RDAC/ignition problem causing the
engine to run rough. I can be reached anytime in the central time zone
at 417-223-4549 or cell 417-529-0411. Shayne McDaniel
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