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Old 08-22-2022, 02:20 AM   #27 (permalink)
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Originally Posted by Isaac Zachary View Post
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.
This sounds like EGR with extra steps.

Originally Posted by Logic View Post
...the only ways I can think of for the engine to "howel" are:
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.
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