I'm posting this on behalf of a friend so...

 

Currently looking to make a Briggs & Stratton 4stroke 1 cyclinder engine quieter as part of my final year uni project.

 

Despite it having a low spec muffler, I am looking at different muffler designs to add to the engine

 

 http://www.briggsandstratton.com/eu/en/engines/other-engines/2100series_other

 

Perhaps a ‘glasspack’ as they are relatively easy/cheap to make and can reduce the noise considerably. Although struggling to find any specs for them, for example…is there any benefit for having a certain amount of holes in the perforated inner material, or a desired length?

 

Thank you!

LOL,  like School Homework,  when at school,

you do a project because it is your project,,  

Your Mum or Granny is not supposed to go to the library for you, and your Dad help build the model.

 

so what does he learn about research if you do it.?

What he is learning is how to be a Manager and Delegate to others that probably know more than the managers.

I'm not an engineer but an exhaust silencer works in the same way as silencer of a gun. From what i understand you have to prevent the air expanding out as fast. Hence you need more space for expansion and baffles. The old Briggs side valve engines just came with a primitive muffler bolted onto the side of the exhaust ports. The earlier ones barely had that, just a little circular thing.

I would design a bigger better baffled system myself but not an engineer and have no idea how it would affect the gas flow and the engine's running characteristics :/

Get an old lawnmower that runs off of fleabay or freeads and experiment with glasspack and others i guess.

Edited 3 February, 201412 yr by Matt Bodycombe

Big pillow + gaffer tape, job done.