National Aeronca Association Bulletin Board

Can someone email me some pictures of their tailpipes?
I'm fitting a new cowl on my 7EC (C90) restoration and my old pipes are pretty beat and cobbled together. It appears to have the same mufflers as my 150. Are the pipes supposed to be straight? Mine have about three different angles welded into them. It was apart when I acquired it so I have no idea what they looked like on the airplane.
Thinking about stainless for the new ones.

Thanks in advance,
Steve near Chicago

Steve,
The 150 Cessna pipes won't go through the 'original' Aeronca lower cowl opening. It's necessary to either cut new holes in the cowl or 'remake' the tail pipes to fit the original holes or make a new lower cowl and put the holes in line with the 150 pipes which is what I did on my last job. On my previous Champ I did do some creative cuts and rewelds in the tail pipes in order to make the tail pipes exit the original cowl holes. I guess either way works. The Halon-Wilson muffler system which is certified for Aeronca will exit the original holes properly. I always thought it would be neat to make the pipes so they would exit the back at the lower pressure cowl outlet. A 337 is (technically ) needed to legally install the 150 Cessna system.

If you go to the "Restoration" part of the forum and scroll down to "Into the Wild Blue" (I think it's on the second page) there's a couple of pictures of my L16 with the 0200 engine and Cessna 150 exhaust system exits. I always thought they could have been a bit longer but seems to work OK as is.

Hope this helps.

Mike

Mike,

Very pretty airplane and thanks for the info. That explains the creative welding. I like your idea of running the exhaust back to overboard in the cut-out. I have to think about that now.......

Steve near Chicago

Mike,

I seem to recall that the Buz Wagner 0200 STC specs several exhaust systems including a Piper style exit. I used the 150 exhaust system. If I think of it tomorrow, I'll look up the STC.

BTW, I fabricated a new cowling to accommodate the 150 exhaust pipes. The stock pipes were too short.....soot on belly. So I extended them about 3 inches.

Dennis

Dennis,
You're right! The Buzz Wagner STC leaves a lot open to 'interpetation' which is not always bad as long as everything is safe. I think you can use any exhaust system that 'fits' and even build your own including straight pipes. I thought about using the straight pipe system because it sounds 'cool' but then started thinking about the cold weather up here in the north woods and the 0200's have a reputation of being 'ice machines' with carbureator ice. So I went with the 150 mufflers. The stacks are a bit short like I mentioned.

On another note: how does the oil temperature run on your Champ/0200 application? I have a hard time getting mine up to 170 degrees even with what little hot weather we get up here. I think flying to Oshkosh I saw maybe 165-170. When it starts to get cold I block off part of the lower pressure cowl outlet. Brings the temperature up to a reasonable amount and keeps my toes warm, too. I've often thought of building a 'cowl flap' I can control from the inside with a pull cable but still on the list.......

Mike

Mike,

I was flying this afternoon and I checked the oil temp....for that matter, I always check it when flying but ill be darned if I can remember what it was reading. Seems like it was around 170. I'll write it down next flight.......if I can remember . Damn, I hate getting old but it is better than the alternative.

Just a side note, after propping the engine and walking around the strutt, I heard tapping metal noise I had never heard before. Oh crap, I was afraid something was broken. I placed my ear on the noisy strutt and traced the noise to the door bumping on the door stop. A relief so I jumped in and bored some holes.

Dennis

MikeB,

I remembered to check my oil temp today. My oil temp gauge has a mark at 100 and another at 200 with 150 placed about center of the two marks. I flew for about an hour. At first the oil temp was around 165, maybe 170 max. As the outside air temp dropped, The oil temp dropped to about 160.

Dennis

Dennis,
Thanks...looks like we are both about the same regarding the oil temperature. Also, we must have the same oil temp gauge markings (leaves a bit open to interpetation). I always thought I would have 'oil temperature creep' with the 0200 boxed into the Champ configuration but almost more of a problem keeping the oil temperature up to a reasonable running temperature. I have dual cylinder temperature gauges with sensors in the back two cylinders at the spark plug locations. On a hard climb I might see 375-385 degrees and it will usually cruise at around 300 degrees, give or take a little.

Mike