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No, Mike, you correct, you do not NEED the injector
disable switches. However, there are several reasons why you might want to
consider installing them.
Should you ever have an injector malfunction -
say their wire to the EC2 grounds on your firewall- in that case, the
injector (or both assuming both of their wires grounded) will go to full
open and could possibly flood your engine - particularly if you are operating at
lower rpms. With a disable switch you could turn that pair off and fly on
the other.
Even if an single injector stops functioning properly, the
engine is affected - depending on what the injector malfunction is - the engine
will likely not operating smoothly - so simply turn off the effected injector
pair and fly home - without a sputtering or bucking engine.
You see your EGT start acting up - you could determine
which set of injectors (primary or secondary) is causing the problem and from
there which particular injector of the pair (rotor 1 or rotor 2 assuming
you have a separate EGT for each rotor) may be bad or acting up.
I had a malfunction one time where the cold start function
was forced on (nothing to do with the switches) - with the cold
start function engage and both pairs of injector operating
the engine had way too much fuel (even when the mixture control was turned
to minimum), but switching off one pair made it possible to get home with no
problem.
You can also use them to shut your engine off immediately
- even with fuel in the lines, if you turn off the disable switches, the
injectors will immediately stop injecting fuel.
But, you are right, they are a point of failure,however, I
would not consider them a single point - unless you have the bad luck to have
both of them go out at the same time, because so long as one is working, you can
fly on one pair of injectors with no problem.
Again, the choice is up to you, but they do have some
benefits.
Ed
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