----- Original Message -----

From: Bobby J. Hughes

To: Rotary motors in aircraft

Sent: Tuesday, April 21, 2009 8:20 PM

Subject: [FlyRotary] EC2 address range issue

I sent an email to Tracy but he's at SNF this week and not sure he will see it until next week. Though I would run this by the group.

 

Mixture Correction Table address 32-41 are giving me problems. Here is an example of what I am seeing.

 

Address 37 , MAP 12.1, RPM 3010, Val +26, O2- 14.5  Tuned perfect. Move the throttle up and down the map table and engine starts to run poor in the address range. Adjust throttle back to Address 37 and things have changed.

Address 37,  MAP 12.5, RPM 2270, VAL +26, O2- 12.5  Tuned rich.

 

I have tuned this range a dozen or more times. It also happens to be right in my taxi range.

 

Ground run settings.

 

Prop in fixed mode at high rpm setting.

Supercharger 1" bypass open so no air is being compressed in manifold.

Prop and supercharger settings do not seem to make any difference with this problem.

I played around with mode 7A changing the rpm vs manifold reference points but did not seem to make a difference.

 

I can idle at 10" MAP and 1200 rpm.

 

 

 

Any ideas?

 

Bobby Hughes

(last item before flight)