George,

I printed a guide for ACRE in the DDP about the effectiveness of the various jets vs. throttle opening. To quickly recapp, The pilot jet is effective from idle to about 1/8 throttle, the slide cutaway works the transition from around 1/16 to 1/3 throttle. The needle and needle jet, and the multiple tapers on the needle, in a conventional carb work the area from around 1/8 to 3/4 throttle and the main jet is the most effective after that. The ranges do overlap some. To win a bet one of the instructors athe Kawasaki took the main jets OUT of his 900 Kawasaki and drove it to work all week on the freeway just to proove that most people use the 1/8 to 1/2 throttle range 99% of the time. An airplane does use the WOT area a lot more. FWIW
Bill


-----Original Message-----
From: George Lendich <lendich@optusnet.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, 28 Sep 2007 3:20 pm
Subject: [FlyRotary] Re: Carbs

George,
The notch, or really the slide cutaway, is used to accellerate the air over the pilot jet. This helps make the engine idle smoother.
Bill

Bill,

Thanks for confirming that!

George ( down under)