RE: IML: Duel Snorkel

[David Whitney <david.whitney@xxxxxxxxxxxx>]

Hi, Steve --

The symptom you described could also be due to carburetor settings/metering
that caused the mixture to be rich at WOT.  In other words, it could be not
the right amount of air for the amount of gas being sucked through -- it's
not necessarily evidence of insufficient air flow.  Your stock engine could
have been overjetted or undermetered.  That's why I said dyno testing.

The engine can not demand more cubic feet of air per minute than the result
of the swept volume x RPM x volumetric efficiency formula.  If the air
cleaner, isolated from all other systems, allows that much flow when
exposed to the same vacuum as is created in the intake manifold by the RPM
at which max flow occurs, then it is sufficient.  If it does not allow that
much flow, then it is restrictive beginning at that RPM point where the
engine demands more air than what passes through the air cleaner.  Street
cars spend all or almost all their time at lower RPM than that.  That's why
I said the stock setup is sufficient for a stock engine.

Actually, with my pain in the butt hat on, it could have been that your air
cleaner housing interfered with the linkage.  Did you try running a dual
snorkel, and did it make a difference, or was it just the difference
between off and on?

Not trying to start a snorkel fight here, just trying to explain my
methodology.

-- David


                                                                                                                                              
                      "Steve B."                                                                                                              
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>In a stock setup, the air cleaner assembly is proper for your engine's
>requirements.  Now, the ifs start.

My '73 was stock and it ran out of air at higher RPMs with the stock air
cleaner.  No dyno was needed for that test..  The difference with the
air cleaner on and off was like night and day on that vehicle.  The only
thing I could figure was they went to far trying to silence the intake
noise.

              Steve B.

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