Has this ever happened to anybody else on here.
When I start the 1983 RX7 12A this pipe is resonating acoustically
so loud you can here it with the air filter on and the hood closed.
When I put my thumb over the hole to seal it the noise goes away.
It appears to be sucking air for some strange reason. Does
anybody know what this particular pipe and air intake are for?

It does not do it all the time and seems to go away after the car
is driven for awhile.

Paul Lamar

American Flyer wrote:

Paul,

That device you point to in the picture is a thermal valve (bi-metallic 
strip actuated) which opens (or closes, I forget which) once
the engine gets up to normal operating temperature. They are 
usually used to control vacuum-actuated plungers elsewhere in the
induction system to adjust things like idle speed.

Harrison Young

I was pointing to the opening just to the right of the thermal valve.

Paul Lamar
 
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