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

Jerry Bass wrote:

I think it's called a Velocity Augmented Manifold.

Jerry Bass
540-932 3125
Cell 241-2675

Jerry did some R&D on it. Thanks Jerry.

Paul Lamar

Paul Carey wrote:

Paul
What is the specificf purpose of the VAM muffler? - noise reduction? Be
interested to see if anybody did any db readings with and without the
muffler.
Are there any performance advantages with short runners into the cylinder
shaped muffler (increased scavenging etc).
I am interested because my drag car is required to be 95db at some race
meetings where mufflers are required. I have three pipes exiting out of the
side of the car, each with a "Gonzo" muffler, and the noise is still quite
high.

Regards PC

Paul Carey LAME, MC
Aero Management - aviation consultants.
www.aeromanagement.com.au
(08) 9371 5205  0418 959 892

Cool the internals of a muffler and cool the exhaust to reduce damage
to the pusher prop.

Performance is obtained with about 32 inch long individual pipes.
Here are a few alternative 32 inch long pipe tuned exhaust systems
The VAM principle can be implemented in these systems as well.

Paul Lamar
 
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