Quote:
Originally Posted by Isaac Zachary
One idea I had (ya, I'm no scientist) was to filter out the nitrogen from the air and then replace it with the CO2 and water vapor from the exhaust.
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This sounds like EGR with extra steps.
Quote:
Originally Posted by Logic
...the only ways I can think of for the engine to "howel" are:
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You forgot about the entirely mundane possibility that there was some flat surface now that had air passing across it, causing it to vibrate. Like a torn piece of filter medium, or some piece of ducting separating from the piece next to it, or similar. Lots of whistling or howling noises could be produced that way.