Canister Mufflers-How do they Work?
11-15-2005 | 12:36 PM
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From: Goshen, IN
Canister Mufflers-How do they Work?
Would like to know some more about canister mufflers. Are they just a low resistance muffler or do they have some tuning ability? Are they something similiar to a mini pipe that works like a 1/4 or 1/2 wave type of tuned pipe? Do you have to have a specific length header pipe to match the canister? What do they look like on the inside? Anyone have any drawings of how the inside is constructed????
11-15-2005 | 12:55 PM
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From: Boisbriand,
QC, CANADA
RE: Canister Mufflers-How do they Work?
Dick Hanson gave a good explanation in another thread (new ZDZ-80):
Dick,
What exactly makes a tuned can "tuned" and a canister "not"?
I understand the concepts of timing the exhaust "repercussions" so that it come back and is just oging out again to help "draw" exhaust out of the engine... at least I htink that's what I understand...
But wouldn't ANY can have some level of repercussion?
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J. David
Columbus, OH
http://www.hangar37.net
(in reply to dick Hanson)
Report | Post #: 218
RE: New ZDZ-80 - 11/12/2005 6:05:40 PM
dick Hanson
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yes-- the trick is to get minimum losses on non tuned can --and that means typically that you use extremely short header --it just adds a little backpressure to stop problems at idle but actually performs close to open stack power at various other rpm.
IF you put this on a long header --power goes down from open stach - having tested this a number of times I always ge same result -shorter header is always bette on th non tuned cans
the tuned cans -which I have posted a number of times here --are shaped much the same extrenally --the difference is that they have a reflector of some sort close behind the inlet header pipe -this acts to "back up" the wave coming down the header and also acts to extract the outgoing gasses . sort of a poor mans' tuned exhaust
The big BUT is that they are not as good at it as a gradually increasing diameter device going into a long open chamber -for extraction ("tuned pipe). The classic dual cone shape makes th best power --at a given rpm but can be a worthles thing for getting smooth power from low speed running cool to max power -
Why?
as the heat come up the whole thing changes (on any of these) and depending on where the pipe /prop load is set- there may be a huge bogging down till the mixture and the heat get normalized.
So critical tuning is just that-- critical and broad tuning tho not giving as much power peak is of far greater value to aerobatic setup - A really good muffler is preferred by many as it allows best response throughout the real operating range. Areally good broad band pipe is also desirable and properly matched the best over all - the hook is that these are typically pretty large and long
What exactly makes a tuned can "tuned" and a canister "not"?
I understand the concepts of timing the exhaust "repercussions" so that it come back and is just oging out again to help "draw" exhaust out of the engine... at least I htink that's what I understand...
But wouldn't ANY can have some level of repercussion?
_____________________________
J. David
Columbus, OH
http://www.hangar37.net
(in reply to dick Hanson)
Report | Post #: 218
RE: New ZDZ-80 - 11/12/2005 6:05:40 PM
dick Hanson
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Certified
Posts: 5395
Joined: 12/12/2001
From: slc, UT, USA
Status: offline
yes-- the trick is to get minimum losses on non tuned can --and that means typically that you use extremely short header --it just adds a little backpressure to stop problems at idle but actually performs close to open stack power at various other rpm.
IF you put this on a long header --power goes down from open stach - having tested this a number of times I always ge same result -shorter header is always bette on th non tuned cans
the tuned cans -which I have posted a number of times here --are shaped much the same extrenally --the difference is that they have a reflector of some sort close behind the inlet header pipe -this acts to "back up" the wave coming down the header and also acts to extract the outgoing gasses . sort of a poor mans' tuned exhaust
The big BUT is that they are not as good at it as a gradually increasing diameter device going into a long open chamber -for extraction ("tuned pipe). The classic dual cone shape makes th best power --at a given rpm but can be a worthles thing for getting smooth power from low speed running cool to max power -
Why?
as the heat come up the whole thing changes (on any of these) and depending on where the pipe /prop load is set- there may be a huge bogging down till the mixture and the heat get normalized.
So critical tuning is just that-- critical and broad tuning tho not giving as much power peak is of far greater value to aerobatic setup - A really good muffler is preferred by many as it allows best response throughout the real operating range. Areally good broad band pipe is also desirable and properly matched the best over all - the hook is that these are typically pretty large and long
