You can bet I'll test this on any injector I install, including the brand new pair that just showed up 5 minutes ago. 

 

Unfortunately, mine clicked just fine when I tested them just a couple weeks ago, but I still think one is sticking open to some extent.  It clearly puts me in a rich, and erratic condition, and I can't think of anything else that could cause that (connections, wiring, etc).  If the new injectors don't fix it, I'll have to think harder about the possible cause, but I'm pretty confident that all will be well with the new pair of primaries.  I should find out this weekend.  The DAR will be at the airport around 9:00am Sat to make me legal, then I'll start replacing the injectors.  With any luck, I'll be attempting to tune again by Sunday. 

 

Cheers,

Rusty

 

You are correct, Rusty.  While if an injector doesn't "click" it is definitely not for your aircraft, the fact that it does "click" does necessarily mean it is a good injector.  I had an injector that would stick open (didn't know for certain that was the problem at the time) while I was flying and cause the EGT on that rotor to decrease 300F.  It was intermittent and would never do it on the ground (which initally made me think it was some other problem).  The engine noise would change slightly (I guess from guzzling all that fuel) and I would lose approx 150 rpm but other than that and EGT temp drop nothing showed up.  Just about drove me crazy.  Then finally it happened on the ground and by quickly switching between injector pairs I knew which pair and from the EGT I knew which injector - replaced injector and problem was solved.  It still "clicked" fine when I took it out.

 Ed Anderson