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F2D Noise Reduction
F2D silencers design and development
Last update: 21/7 2011

Silencer design:
Silencer design does not have to be rocket science.
With an acoustic noise generator and a sound meter you can easily test new ideas and see the result in a few minutes. You can try out a lot of ideas and find the best design for your engine.
Sound measurements on running engines to see how effective a new silencer will reduce the noise are very difficult.

Design hint:

The flow resistance and the ability to reduce noise are not necessarily connected. It is possible to optimize the silencer's effect on the noise without changing the resistance in the gas flow through the silencer. A silencer can be designed to reduce noise without changing the back pressure and without changing the way the engine is running. More info

Silencer test service:

If you do not have a sound meter and would like to have a new silencer design tested with the acoustic noise generator you are welcome to send the silencer to me. I can measure your silencer and send you the test result back together with the silencer.
Here are the results from tests made on different silencers.

On this video clip you can see how a silencer is tested with the noise generator.

  Test your design:
Send your silencer to:

Henning Forbech
Bülowsgade 36
DK-8000 Århus C


Silencers for F2D
Raports on
tested silencers

Ready to test a new insert tube for the Lithuanian muffler. The insert tube was made by Bjarne Schou

A couple of new silencer at the demonstration in Gyula, Hungary
Advanced silencer design:

If you want to design more advanced silencers like the multi chamber side resonant type described in report on F2C noise you will find a lot of useful information in the book: "Design and Simulation of Two-Stroke Engines" by Gordon P. Blair

The description of a new experimental silencer for Team Race can give you some hints on what results can be achieved with well designed silencer.
You will find the description and more interesting information in Rob Metkemeijer's " Interim report on noise in F2C"         < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 >