Ben Schneider wrote:

For those of us new to the list, what is a VAM muffler? Don't know
all these abbreviations yet. Thanks...

  Ben Schneider RV7  rigging the controls.

Bill Jepson invented it and Ed Klepeis made the prototype.
You need a valve on the front hole to shut off the flow
out the front hole when the engine is idling. After the
engine is generating power that hole sucks in cooling air.

Paul Lamar
 
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