Posted 02-21-2001 at 08:34:46
[Reply] [Send Email]
Tom- A machine that old could have many things getting weak, even though it's had good maintenance over the years. Please be careful!
That WHOOSH when a burner lights off indicates there was an excess of fuel and insufficient movement of air. If the situation happened inside a container it would be an "explosion".
The last one of them oil burners I tinkered with had everything happen at once- fuel, air, and ignition switched on at the same time. Yes, it caused a WHOOSH & flash, but it was acceptable to the designers.
During start up, modern gas turbine engines (jets) are supposed to first spin up the tubines and get the air flowing, next fire the electric spark igniters, and lastly shoot the fuel to it.
Once in a while a commercial pilot will be impatient about getting going and short cut the engine crank procedure, and not wait for the starter to spin up the turbines properly before bringing in the fuel. Those are the times you see frightened passengers because of smoke and occasionally fire puking out of the engine.
Suggest take a real close look at the spark igniter, how it's positioned relative to the fuel/air spray, and quality & strength of the spark. Make sure the blower fan intake is not restricted and the blades are not clogged with accumulated dust, and is moving air like it should. Also, give the firebox and chimney piping a close looking over, because that WHOOSH puts a pressure spike thru the system and stresses those parts.
Ignition delays like you mention are scary to me, so please don't ignore it. IHank