Ragsf15e

Cody’s just showing off now. That’s awesome.

Yeah I think you’ll like it. Smooth running, real easy starting, and LOP definitely seems smoother and easier.

I’m currently breaking in a new cylinder too, but in an io-360. Mine was noticeably warmer than the others, but nothing like yours. I’m seeing like 380 in cruise while the others are 330. I have the bonus of very cold air temperatures for breaking it in (Eastern Washington in winter). What kind of cylinder is it? Mine is chrome. so one last thing to possibly just glance at... make sure you don’t have a small exhaust leak on that cylinder or the one next to it heating up the area near the probe.

At least for me, run up hasn’t been an issue. It does skip a beat, but no bang, noise, vibration, nothing. When I did the LOP mag check at 65% power, that was more exciting. Next time I’ll try their technique of pulling power after checking the second mag. For some reason, the shutdown check also got a bang. I’ll try to see if I can find something that works for that too.

The attitude function in FF only works with an outside ahrs attitude source. It will give a giant red x without a connected ahrs. So it’s not a function of working off the iPad accelerometers. Supposedly these ahrs have a mtbf of 10,000hrs or greater (which I have no source for). I think we should all thank Skip for having his fail so soon which ensures everyone else’s will last 20,000 hours!

I have a Surefly on an IO360. Its real nice. Better LOP operation, starts really easy. The “afterfire” thing is real though, at least on mine. During runup at 1700rpm it’s just a slight skip. I did a LOP mag check at 11,000’ and 65% power... it was a loud bang. I also got a somewhat smaller bang when I checked the key off position to make sure the engine would shut down at idle power. The issue is that the Surefly takes like 5 ms to start sparking after being shutdown. When you’re checking the Surefly, then go back to both, all is well, there is always a mag firing. When you check the Right mag and then cycle back to both, you pass through the “Surefly only” position on the ignition and it takes 5ms before you get a spark. Depending on power setting, it may be a bang. This is with a traditional ignition switch. I do like it though. I need to do a few more flights and collect more data, but high altitude LOP seems to have a measurable reduction in ff or increase in a couple knots.

On my last flight I did get that CO alarm from the sensorcon but it was only 40ppm which is higher than normal on the ground but not a huge increase (I usually have <20 on the ground and 0 in the air). When I put her away this afternoon I wiped down the cowl and there is a very light exhaust stain along the aft edge of the lower cowl on the affected side. Tough to see unless you’re specifically looking for it. I guess this has been one more example of an engine monitor proving its worth. It was directly responsible for showing me a problem existed and partially identified the exact problem.

Good to know, thanks for that helpful insight!

I see what you did there!

Solved. I really thought the induction leak was the best hypothesis, especially since the problem wasn't really visible at full power, only idle (for the most part - I did eventually find a few anomalies at full power). Did you know that 3 guys (2 x A & Ps and 1 x Pilot/owner) standing next to the engine staring at the #4 cylinder can't see the exhaust studs & nuts? It takes bending down lower to look up at them which I did this weekend when I went to look for an induction leak. Below is what I found. I looked at the ground run after annual and the first flight after annual. The EGT is just fine until midway through the first flight when there are a few weird excursions. Then it's always a bit wonky at low power for the next two flights and a ground run before I realized there was a problem. The last flight I got a Carbon Monoxide alarm from my Sensorcon while taxiing in (40ppm). Way higher than usual on the ground. I still was showing 0 in flight. I didn't start to put that together with the engine data anomalies until this weekend. Based on the data from the ground run and first flight, I believe the nuts, washers and star lock washers were there at one point, but weren't torqued or fell off for some other reason. All have been checked again. This was a little scary after the fact. Rags

@Bob - S50 if im not mistaken, you live in that area, where do you have your airplane annual/maintenance? Im in eastern Washington and shopping for a new shop... Advanced in Troutdale is sounding good so far.

That’s what I keep leaning towards. I’m gonna take a look at it this weekend and then check more thoroughly for leaks with my mechanic on Monday. Probably swap the probe too just to be sure.

I’ll see if I can upload and share it from saavy. The Gami spread has been consistently 0.4 for the last couple flights, so not bad, and the engine runs smoothly LOP. I have Gami injectors and Tempest fine wires. The injectors are in the correct locations and the spark plugs tested ok at the annual last month. They looked ok when we pulled them yesterday. It just seems like the lower power (taxi and ground time) is where it’s erratic.

I did do that on the last flight. I did it LOP per the Savvy guidance and it was fine. The ignition doesn’t seem to be the problem. I’m open to any possibilities, but if it was a spark issue, I think the egt would be hotter. Right now I’m starting to think probe issue, or intake / exhaust leak? Maybe the roughness was my imagination staring at faulty egt data? *btw, if you do an in flight mag check with a Surefly, even a new one with the new “quicker start up”, maybe you should reduce power before going from Surefly off, through mag off, back to both. Loud pop that will get your attention. At 1700rpm during the normal ground mag check, it’s just a quiet skip. At 2500rpm it’s more exciting.

My F model just came out of annual. I have a new cylinder (#2), Surefly mag and a newly IRAN right mag. The only cylinder that’s not been recently overhauled is #4. It was running fine coming into annual, but my IA noted some oil in the bottom and some deposits on the exhaust valve and stem. Compression was fine. So I flew the plane 3 times to break in #2 and I’ve noticed slightly rough idle. I was thinking “morning sickness” but then I noticed #4 egt. It’s really low at low power. It’s also erratic. It seems to clean up for the mag check and during flight, but comes back at low power. Today we borescoped #4, looks ok, same deposits but valves open and close fine. Compression check was just fine. Plugs look good. IA took rocker box cover off and springs were ok, valve didn’t seem to “wiggle”. What am I looking at? Failed egt probe? Maybe exhaust or induction leak to #4? I looked at jpi data from a couple months ago and it was fine. This one was only on the ground, but is a good example. RPM between 1000 and 1600. This is startup. Mag check and takeoff. Egt is erratic at low power.