Postscript:
Winter starting required huge amounts of prime, which led to exhaust flames up to 20 feet long. This led to some complacency about flame on start up. One pilot of my acquaintance had an event during which the intercom equipped ground crew monitoring start was saying, for some time "torching.. torching.." upon which the captain looked at the engine and replied "Torching my a**, that engine's on fire" - at which point the ground crew dropped his fire extinguisher and left the scene! Crew had to use the on board engine fire extinguisher.