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6/1 silencing

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veggie:
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Ok ... I tried a third muffler but it hardly made any difference.
The whoosh ... whoosh ... whoosh noise is still prevelent due to the restriction in the mufflers and I don't think the added back pressure is good for the system.

The next thing I am trying is a large pressure dissipation chamber much like some others have done underground but mine will be above ground.
The plan is to use a steel garbage can lined with Roxul fireproof sound insulation. This will allow the exhaust pulse cool to dissipate before leaving the can with much less force.

Design issue !
The muffler is outdoor.
One concern I have is condensation and freezing. Here in the frozen north it is very likely that the engine will be running when the outside temperatures are -15C.
Does anyone know a 'rule of thumb' for how much exhaust water is generated per liter of fuel?
I can put a layer of sand/gravel in the bottom of the chamber and drill drain holes.

cheers
veggie

veggie:

--- Quote from: ajaffa1 on September 01, 2020, 09:21:41 AM ---Hi Veggie, please see the text below cut and pasted from the listeroid 6/1 installation manual:

EXHAUST SYSTEM: A standard engine is fitted with an exhaust silencer. If the exhaust piping be extended to
the out side of the building up to a length of 3 meters, the exhaust silencer can be fitted on the end of iron
pipe screw 1 1/2” BSP.
If exhaust system is longer, following pipe size is recommended.
Pipe line: Up to 3 meter — 38.0mm (1 ‘, 4”) Bore
3 to 6 meter — 50.8 mm (2”) bore
6 to 10 meters — 63.5 mm (2½”) bore over
10 meters — 76.Omm (3”) bore
However, keep the exhaust system is as short as possible with a minimum number of bends and must be erected in
easily detachable sections to facilitate cleaning during overhaul. Never embed in concrete. A faulty system
can seriously reduce the power of the engine.

Bob

--- End quote ---

That's interesting.
Both mikenash and your data do in fact state that the pipe diameter should increase as the run gets longer.
My thinking was that as the outdoor run gets longer the gas would get cooler and contract along the way which would negate the need for larger diameters. I currently use 2" pipe.

I am leaning towards the Garbage Can method suggested by ajaffa1.
Here's an example from our member rbodell... and his is only half buried.
https://www.youtube.com/watch?v=v1ZJ8e3ihZg

... I am also considering this one. It's interesting if you look at what happens when he added the top 2 tires.
They start bouncing slightly. Absorbing the exhaust pulse and taking away the energy.
https://www.youtube.com/watch?v=XZBL5R47E84

veggie:
 ***** UPDATE ******

This is an old thread....
See the update to this project in this thread...

Lister Muffler Project
https://listerengine.com/smf/index.php?topic=9268.new#new

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