I had one go on one of these
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She was burning a gallon a day of oil through the engine and with over 25,000 hours she was due a rebuild, after about a month in the yard being stripped down and rebuilt she was finally ready for the first trip out, I rocked up at the yard at 5 and after a short warm up away we went by half past in the pitch black apart from the amber flashing beacon an headlights, I was about a half mile down the road and all of a sudden the tree lined back road lit up like it was daylight and I looked back to see a 15 foot flame shooting out the top of the exhaust stack, it was insane but really cool
I pulled up and everything was fine, it was just the engine oil burning off in the exhaust lolz