I work on an airfield and this is what i have seen with the oldies (there are 2 spitties, im not sure if they have kept the original engine or not, sorry)
When the engine is started sometimes the flame is yellow and sometimes it goes straight to blue. When the engine is running at low revs the flame is almost invisible and purple, but as throttle increases it goes blue and quite a bit brighter.
Sorry I can't be of more help, this is just what i have seen.
Last edited by SQB; 12-11-2010 at 12:15 AM.
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12-11-2010, 12:10 AM
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