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Date:  8-30-2014
Number of Hours:  0.00
Manual Reference:  
Brief Description:  Success with the AeroCarb!

Wow, what a difference! After chasing around the mixture and temperatures on the #2 needle, and still running too lean, I finally switched to the #2.5 as Joe Norris suggested. After adjusting the idle screw to idle lower, the engine runs smoother than ever, with an awesome idle (in fact, I need to set the idle screw even further out to get a lower idle). Previously the engine would balk at low RMPs on only the primary ignition. Now it runs with just a little dub, dub, dub on the primary, but pretty smooth. With both ignitions on, it's really, really smooth!

At WOT all my EGTs are now 1250 or less, and even my hot #3 cylinder never got above 370. The other 3 were 350 or so. What a difference! (Previously the EGTs were 1400+, 1, 2 & 4 CHTs were 390, and #3 was 400 and higher.) I flew around yesterday at 75% power and had all my CHTs around 350 or less.

Now I fly WOT with no worries. It's like I installed a new engine!

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On the AeroCarb:

I spent hours on mine before getting it right. It's simple, but its simplicity is sometimes its Achilles heel. Many of us have noted that you may not be able to set the needle with any accuracy unless you are very careful. The set screw, that keeps the needle carrier from moving in or out after setting, is susceptible to extreme movement when the set screw makes contact. Apparently (I have watched it happen looking up into the carb throat) the needle carrier threads can be quite loose in the threads of the carb body. So as you think you are tightening the set screw to keep the needle carrier from moving, you are actually also turning the needle carrier and moving the needle I have observed 1/8" to 1/4" horizontal movement!!!

Keith Macht noted that Sonex suggested he peen the carrier threads lightly with a hammer to cause more friction with the carb body. This apparently worked quite well for Keith and others.

So although it's "simple" there are many gotcha's and tricks of the trade that could be passed onto builders to avoid all these hours of work
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