Todd;
This e-mail didn't make it to the list the first time so I deleted the
original message to make it shorter.
Regards, Neil Tucson, AZ
-----Original Message-----
From: Albaugh, Neil
Sent: Monday, February 21, 2005 2:16 PM
To: 'todd'; Jon E. Wennerberg; Keith Turk
Cc: land-speed@autox.team.net
Subject: RE: Jon's air intake question
Todd;
You bring up a good point about creating "dirty air" around a scoop
intake. It seems to me that if there is a significant amount of
turbulence in the intake it will create a variation in the engine
manifold absolute pressure (MAP) that could be a problem.
If the turbulence is bad it will create fast pressure waves that can be
picked up by the MAP sensor. Depending on the system bandwidth (response
time), the dynamic pressure may be simply averaged if the response time
isn't very fast. If that is the case, half the time during a pressure
wave cycle the AF ratio will be too rich and the other half it will be
too lean. Of course, there are normal intake pressure waves as the
valves open & close; if an EFI system can deal with those maybe scoop
turbulence really isn't a problem and I'm "crying wolf".
Any ideas on this, anybody?
Regards, Neil Tucson, AZ
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