RaisedByWolves
FRIEND
Tx
Flown around zero, heat was good, the drafts from the door and window were not. I need to make some kind of deflector, as one foot is on fire while the other is frozen.
Check That Muffler
- Thread starter Steve Pierce
- Start date
Flown around zero, heat was good, the drafts from the door and window were not. I need to make some kind of deflector, as one foot is on fire while the other is frozen.
aktango58
FRIEND
18AA
I got to the point with mine I would take the scat off the heat box in the summer because it was so hot. Winter here, never had an issue, lots of heat.
Cubswede
MEMBER
Sweden
Same problem here with stock (nicocraft) muffler. Did only get 2200static. Had to cut it open to see how the inside looked like. As you can see in one of the pictures, the muffler bail has come loose and slipped down the tailpipe long enough not to do its job..
replaced with used serviceable stock muffler due to shortage from aircraft spruce..
replaced with used serviceable stock muffler due to shortage from aircraft spruce..
Attachments
mike mcs repair
Registered User
chugiak AK
wow, they forgot to weld the bail in???? bad on them!
since you are buying consider, a hot rod Atlee muffler/shroud kit/STC..
http://www.fadodge.com/index.php?option=com_djcatalog2&view=item&id=48%3Ahot-rod-muffler&cid=6%3Aexhaustsystem&Itemid=53
RaisedByWolves
FRIEND
Tx
Damn, that's crazy. That's the reason to get rid of the stock muffler
Steve Pierce
BENEFACTOR
Graham, TX
Cubswede
MEMBER
Sweden
I had a look at the bail today. It was welded WELL below the upper end of the tailpipe! This would be a report to the authorities! The person welding this piece in clearly have no idea what it's there for.. Do you have a reporting function in FAA on material flaws like this? We have that system in Sweden. In this, and many other cases, a Form 8130 or our european form 1 is worth nothing..
Steve Pierce
BENEFACTOR
Graham, TX
mike mcs repair
Registered User
chugiak AK
or did some one buy the bail separate and weld it in(wrong) not the manufacturer (it's an add on item, thats kinda a standard item now...)
Steve Pierce
BENEFACTOR
Graham, TX
Also found out that the Atlee Dodge Heavy Duty muffler that does away with the AD is 1.8 lbs heavier than stock because it is made of heavier material to eliminate issues like these.
mike mcs repair
Registered User
chugiak AK
ya, but your broken one looks/is of the redesigned type??
looks more like a stack miss alignment issue to me...
Steve Pierce
BENEFACTOR
Graham, TX
ya, but your broken one looks/is of the redesigned type??
looks more like a stack miss alignment issue to me...
Please explain your deduction.
RaisedByWolves
FRIEND
Tx
The one that broke after 280 hours was the original style univair muffler.
Here is the one off the top cub
Here is the one off the top cub
Last edited:
I have a hole pile of good used univair muffs.I would run them 1000 hrs about three years then replace because my IA thought the AD started at 1000hrs glad I didn't check .but since I have been using Atlee Dodge heavy duty and never had one fail but the highest time one is about 5years and 1200 hours.Mike is wright about alinement,its easy for me I live near Dawely muf.can drive out and have it all fitted. One thing about the heavy duty can't bump them out. must have pipes fitted to muff.make them fit tight only good way is on fixture then alinement will be right. but to send it out could be costy and timely.but if you want min blown by at muff this the only way,is funny all the 1000hr muffs have no worpage in the tubes Univair makes a good muf but if your flying them 300-400 hrs ayear that AD is a pain.
mike mcs repair
Registered User
chugiak AK
no deductions here, I just fly off the handle and come up with an answer.. right, or wrong
looked like the thicker outer weld... of new style?
misalignment look like stack angle downward putting pressure/cracking...
??????
Steve Pierce
BENEFACTOR
Graham, TX
OK, so you are thinking the outlet pipes are misaligned and putting the muffler end in a bind. That makes sense. We will install without the muffler and see what it looks like. Thanks.
little wing
Registered User
I'm sure Univair or cub crafters will come through for your customer since it's such a low time unit. If they don't, I'd say flame them. Obviously the modification is an admitition of a faulty product. Do you think these companies produce products that put people's lives in danger on purpose for the all mighty (or weak) dollar? If so, perhaps we should choose, more wisely which aircraft we buy and which product may be placed on said aircraft. This sounds like a life threatening, expensive, load of sh&@!!!!! Perhaps that's what these companies are????
skywagon8a
MEMBER
SE Mass MA6
Steve along this train of thought. Have any of the cylinder exhaust ports been machined down to clean up erosion from a leaky gasket? If so this will throw the alignment of the pipes out of whack and could be the cause of the cracking. I've seen this happen in just one trip around the traffic pattern.
Steve Pierce
BENEFACTOR
Graham, TX
No Pete, checked alignment and perfect. The engine has 280 hrs since factory new as does the airplane. Saw another one break the header pipe at a weld on a Top Cub with 360 hrs on it while flying back from Oshkosh a few years ago. We look these things over with a fine tooth comb but don't expect to find these kinds of issues on such low time airplanes. These can lead to catastrophic failures with huge consequences so please be diligent in your preflight.
Steve Pierce
BENEFACTOR
Graham, TX
I would hope both pilots followed the placards installed. The muffler pictured above was only operated with the Sensenich for less than the first 100 hours.
Steve Pierce
BENEFACTOR
Graham, TX
little wing
Registered User
I don't think there are any restrictions placarded or in the POH regarding RPM and the C4P, on a Top Cub. I know there is on the other engine offered by CC for that airplane, but not the C4P.
mike mcs repair
Registered User
chugiak AK
cylinder falling off?
have heard of a O-320 on a PA-12 that the exhaust was all that was holding it on.... the base nuts had fallen off!!
Cubswede
MEMBER
Sweden
I recieved my new nicocraft (wallcolmonoy) muffler yesterday. Bought it from aircraftspruce. The muffler bale is welded in too low in this tailpipe aswell... Does not even enter the muffler body..
seems as all nicocraft muffler bales is welded the wrong way. The old muffler is at least 10 years old.
money back possible?
seems as all nicocraft muffler bales is welded the wrong way. The old muffler is at least 10 years old.
money back possible?
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