Mailing List lml@lancaironline.net Message #27664
From: Brent Regan <brent@regandesigns.com>
Sender: Marvin Kaye <marv@lancaironline.net>
Subject: Re: IV-P continental detonation
Date: Mon, 17 Jan 2005 12:47:11 -0500
To: <lml@lancaironline.net>
I agree with George and Charlie that Andre's experience was not detonation, which would not manifest as a single big bang.  Compressor stall would produce the perceived  noise without a combustion event in the exhaust system but the engine's "E" designation and the rough running before the event point to ignition or fuel.  No big leap of insight here as an engine needs three "consumables" to produce power, air, fuel & spark, so if it aint air it's gotta be one of the other two.

One thing I would add to check, based on the comment "one loud bang lasting 1 second
", is the fuel system. A second is a long time for an ignition problem. I would think it is not a problem with a clogged filter or screen because this would not cause a transient event and the flow rates are much higher during takeoff.  A balky pressure regulator, relief valve or fuel pump could be the problem  but, given the Wx lately, my guess (emphasis on guess) is either fuel contamination, specifically water or low vapor pressure pressure (winter gas) combined with the warm (-10C) OAT to cause fuel pump cavitation.

A thorough check of air, fuel and ignition systems IS in order.

Regards
Brent Regan
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