I havent flown my RV since a couple of cases of lost data in the EC2 back in february. Spent the last few months making a bunch of mods, some suggested by Tracy, others were things that I thought might increase long term reliability. Also had to fix leaking fuel tanks in the ensuing period.

 

Been working up toward renewing flight testing. Engine has been running really well for the last few months. Thought that the problem was cured, though not clear how. Then on saturday found that once again my B controller had lost all data. Engine wouldnt run at any throttle setting on B. Restored the B controller by copying A > B.

 

Last night after work ground ran the engine for about 30 minutes at various throttle settings and it ran as good as always. Also ran fine on the B controller.

 

Tonight after work I fired it up. Ran fine initially. After about 15 minutes noted some minor surging at a couple of throttle settings below 2000 RPM. Also noticed that in this RPM range where the mixture had previously been fine, my mixture monitor is off the scale lean. Slowly got worse, to the point that it wouldnt idle at what was previously a solid 1350RPM. Couldnt get it to run at all below 1500, everything between 1500 and about 3000 RPM pretty rough. Everything over 3000 is fine. No idea what caused this change. I put the airplane away and walked away in disgust. I'm back to where I was a year ago and I'm just about fed up with this thing.

 

Mike Wills

RV-4 N144MW