Flying Norvel Muffler!
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Flying Norvel Muffler!
When I purchased a Norvel .074 engine I was delighted to see that the muffler was secured with two screws. But on the second day of operating it on a test stand I was startled when the rear section of the muffler popped off and flew downwind. Only a bit of friction with the O-ring secures this piece. Will I have to wire this on? Has anyone else had this problem?
Dave Segal
Dave Segal
#4
Flying Norvel Muffler!
I had that happen on one of my .074s during break-in on the test stand. The muffler expanded as it warmed up and allowed the end to pop off. I drilled a small hole and used a small screw to secure it. I've also done this on .061 mufflers when they get older and loosen up a bit.
I've attached a picture. Sorry if it's hard to see, I had to peek in through the cowl.
I've attached a picture. Sorry if it's hard to see, I had to peek in through the cowl.
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Thanks for the suggestion Bipe Flyer. I will contact Sig tomorrow to see what they say. But your idea will be useful if nothing else comes up. What size screw did you use? Was it a self-tapping screw?
And BTW, how did you take that nice closeup?
Dave Segal
And BTW, how did you take that nice closeup?
Dave Segal
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I've never had the rear end of any .074 muffler come off. I don't believe that it was intended that the O-Ring is supposed to be the only thing holding it on. If your tighten the rear screw sufficiently, the back end ought not to fall off. Just try tightening your screws. Works for me.
#7
Flying Norvel Muffler!
Originally posted by Dsegal
Thanks for the suggestion Bipe Flyer. I will contact Sig tomorrow to see what they say. But your idea will be useful if nothing else comes up. What size screw did you use? Was it a self-tapping screw?
And BTW, how did you take that nice closeup?
Dave Segal
Thanks for the suggestion Bipe Flyer. I will contact Sig tomorrow to see what they say. But your idea will be useful if nothing else comes up. What size screw did you use? Was it a self-tapping screw?
And BTW, how did you take that nice closeup?
Dave Segal
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I just called Sig tech support. They said that tightening the muffler retaining screws pinches the muffler end to hold it in place. I just tried this and it seems fairly tight. But I may add a little loop of wire to be sure during test flights.
Dave Segal
Dave Segal
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I just had a "sticker shock". The .074 muffler assembly does appear on the Sig web site with the other Norvel mufflers. So out of curiosity I contacted them by email and asked about the availability of the muffler assembly. They have them in stock and the price is $17.99 plus shipping!
Dave Segal
Dave Segal
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Dave,
Don't feel bad. I like to modify my .061s to take a bolt on muffler so I ordered 5 of them without even asking the price. Keep in mind that 17.99 US dollars is 27.00 Canadian dollars. Along with freight, tax, customs, the bill was over 160.00 dollars. That was a couple of years ago and I've found use for all of them but still.
Don't feel bad. I like to modify my .061s to take a bolt on muffler so I ordered 5 of them without even asking the price. Keep in mind that 17.99 US dollars is 27.00 Canadian dollars. Along with freight, tax, customs, the bill was over 160.00 dollars. That was a couple of years ago and I've found use for all of them but still.