flyrotary@lancaironline.net Mailing List Archive

Bernie,

My fuel system will sometimes hold the fuel pressure for several days. But, it will always hold the pressure for 30 minutes or more after turning off the fuel pumps and injectors. So it sure seems something is continuing to let the fuel into the chamber after you have turned things off.

Try this. Place your injectors OFF, turn power to your EC2 OFF. Turn on your fuel pumps and monitor your fuel pressure. Once it stabilizes at around 40 psi. Turn off your pumps. Note how long (quick) it takes the fuel pressure to decay. If it does it in less than 5 minutes you have a leak.

Another possibility is that your MAP in your EC2 may be wrong now that your starting compression is so much better. I suspect that with the higher manifold pressure with your previous lower compression the EC2 had to be adjusted pretty rich to run at all. Now that your manifold pressure signal is much better (pressure lower) during cranking it may be that the EC2 is still set and injecting too much fuel (although I would have though the EC2 would automatically have compensate enough to at least get started).

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

From: WALTER B KERR

To: Rotary motors in aircraft

Sent: Saturday, July 30, 2005 12:39 PM

Subject: [FlyRotary] Too rich, no start

Finally got around to getting the 13B installed back in the 9A. Lots of excuses why have not got it back in earlier since since Bruce Turrentine went through it to see why the cranking compression was so low. He found blow by on the side seals , but could not explain why. It now feels much more like others when you swing the prop through.

It did not start right up like I hoped now that it has better low rpm compression. Pulled plugs from both rotors and both were wet. I noticed that when leak checking the fuel system before cranking that the fuel pressure immediately went back to zero.

Suspicioned that an injector was leaking but ruled that out since both rotor's plugs were wet after trying to crank.

????I would think that would indicate a Leaking injector!!

Checked the rate of fuel pressure decay after shutting the fuel pump off both with the injectors on and disabled. No real noticeable change.

Any suggestions??

My memory is correct that the fuel pressure stayed up a relatively long time on shutting the pump off before I had the engine out isn't it??

Bernie, maybe I'm too old fashioned to get all this electrical stuff to work :>(