Interesting discussion. If the pilot were to leave the throttle exactly where it is when the engine kicks into high supercharger, would the following happen(?): Engine briefly surges from 54" to 67" and then goes back down again to 54" as the pressure regulator catches up? So if the pilot didn't manually move the throttle back up to the-now-possible 67", he would actually start to slow down...because 54" inches in low blower delivers more power than 54" in high blower. Right? Or am I totally misunderstanding how the man. pressure regulator works?
Scott - A2A wrote:
Yes, the manifold pressure regulator adjusts the engine internal throttle to maintain a certain pressure, based on the cockpit throttle position.
However you are doing a WEP climb (the throttle would be wide opened), the pressure will continue to drop as you climb over 10,000 feet. Once the supercharger switches into high gear, the manifold pressure rapidly advances to 67".
Now let's say you are in a cruise at 40", at 8000 feet, on LOW blower, then manually switched to HIGH blower, you just get a momentary surge of pressure (not more than a few inches of manifold pressure) and a little vibration in the airframe.
Ah..right, duh, we're firewalled to begin with, so of course its going to jump up and stay there
. Makes sense:oops: