Miata Mailing List: September 1993, Message #83
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   From: RMCELEARNEY@delphi.com
Subject: air intake
   Date: Sun, 12 Sep 1993 11:18:38 -0400

A while ago, Mile Rother  wrote:
>Based on this test, here's a recipe for what may be the least expensive
Miata performance improvement.  Advance timing to 14 deg BTDC for a two hp
gain.  Switch to a K&N air filter for another 2 hp.  Install an intake tube
off the front of the airbox - collecting air from just to the left of the
fan shroud.  Intake temperature will drop by about 25 degrees on a 90 degree
day, giving another 2 hp gain.  The result is a 6+ hp gain for under $60.<

This sounds like something worth doing.  Someone else has suggested that
cutting a hole in the firewall and drawing air from the cavity just under
the hood end might be a good way to get colder air to the combustion
chamber.  My question for the group is this:

Because of the angle between the hood and the windshield, would the air
pressure in this area be slightly lower or higher at speed?  If higher, it
would seem to be the place to put the intake.  Anyone Know?