Or maybe a piston ring

I keep on changing the reason why we think the engine is not performing anymore. This is after I put the new pistons in a couple of months ago…..

Today Rutger (my son) and I went back to the hangar after we dropped of the Bleriot on its trailer from the Omaka CF2017 trip just over a week ago.

We assembled the plane again. I took the opportunity to put some new foam in the gab between the root of the wing and the fuselage, and this time I used a electric bread knife to cut of the excess material. That looks 100% better then what I did last time (this was quite a few months ago) .
One thing I noticed immediately when I was pulling the Bleriot of the trailer is that it was dripping a lot of oil from one of the exhaust outlet’s. Something I have never seen before. I didn’t understand and stopped thinking about it as I was busy putting the plane together.

UNTIL, I was finished and was about to leave, when Wayne arrived at his hangar. He said he had been thinking about my engine, as you do when things aren’t right 🙂

He recons one of my piston rings is broken.

That’s when it clicked inside my head:

  • My previous thought about having problems with my exhaust didn’t make sense for one reason: “How is it possible that the engine was deteriorating over the days during the show”.
  • The oil was dripping from the exhaust right next to the cylinder #4 that had the really dirty spark plugs (note that cylinder #4 is at the bottom of the engine, so after stopping, it fills up with oil dripping down inside the engine)
  • Wayne did notice a few weeks back, that one cylinder did have less compression then the other ones. Probably this one.
  • I might not have been able to see the oil dripping out as this will only happen if the exhaust valve is open, and that depends on the prop position Not sure if it is but will check that next time.

So yes, I have one spare set of rings, so the next time I am going to the airport, I will start taking of that one cylinder, and hope that it has a broken piston ring. Hopefully it hasn’t damaged the inside of the cylinder. Wayne recons it should be OK, I mean, no damage…. Hope he is right.

I wonder if that ring, if it is broken, did break while running or maybe it got damaged at the time I put it in. Who knows.


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