Hi John;
Have you checked your wastegate actuator to ensure it's working. You can do
this easily with a nozzle on your compressed air hose (assuming you have one
at your hangar), but DO NOT push the nozzle directly against the actuator
MAP sense inlet, instead just direct the air at it from ~12" away. This will
safely move the actuator without overpressuring it. (this is probably
obvious advice to most).
My original wastegate installation was moved slightly from stock position
for clearance reasons which resulted in the actuator shaft being slightly
cocked to one side. I didn't think it was enough to affect anything, but
after ~20 flight hours the diaphragm failed due to this. I was cruising at
the time, when suddenly MAP increased ~10". I throttled back until I felt
reasonably certain that I knew what it was (while heading straight back to
the airport) then began to try different throttle settings. I found it was
difficult to control the boost above (~40") but not hard below that. (note-
these numbers are from an overloaded memory as I'm at school right now and
don't have access to my log book). When I replaced the actuator I ensured it
was precisely in the stock position, to ensure that the shaft alignment
wasn't altered and I dealt with the clearance issues some other way (can't
remember right now).

Todd
Turbo 13B RV9

  

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of John Slade
Sent: Wednesday, March 22, 2006 11:31 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Turbonetics T04 rotary flies


Hi Barry,
Yes, the wastegate is 46mm in diameter, but it only works when it's
open. So far I don't think it's opening, but I could be wrong. I'm
hoping it's just a matter of adjustment. I'll tweak it down a little
more in the morning. The main exhaust is 3 inches, and the wastegate
exhaust is 1.5.  I do have a blow-off valve set at around 50 MAP.
John


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