Hi Clifford... Thanks for writing.
I'm only theorizing, but it makes perfect sense.
Oil is seeping in through the blower seals (or from somewhere) into the blower and when the piston retracts and reveals the intake port the blower blows in fresh air along with some oil and it is combusted along with the fuel. This is the reason for the blue smoke. The reason that it does not run away, is probably that the amount is too small to support combustion.
When I gunned it the other day and it ran away for a few seconds, the amount probably reached the window of combustion and it took off! Since it was only a minute amount, the run-away lasted only a few seconds.
Then too, when the piston retracts and reveals the intake port, the blower blows in fresh air along with some oil in through the intake and right out the exhaust port. The oil lands on the superheated exhaust manifold... turns into white smoke... which travels out through the tailpipe. Remember it takes only a minute amount of oil to give a billowing white cloud.
When I did Special Effects in LA, we built a small cracker out of a 25 gallon drum. We filled the bottom with Johnson & Johnson Baby Oil just to cover the air manifold and we could make smoke all day without refilling the drum.
You are right about the zip. I use my brothers address as a base. He lives on 85th and Chaparral. I've been bouncing it around from location to location until I find a nice spot where it's not a bother to anyone and I have electricity to work on it. I have it parked at my apartment building right now. The owner is cool. Thought the Rolling Stones were in town.
What do you think of my theory?
Like to hear my theory on gravity?
Thanks again for writing!
If you like... send me an email and I'll send you my contact info.
I haven't read the entire thread but another reason a screamer will run away briefly is if it is dead idled for a prolonged period or driven at low speed, especially at low engine temps or if it has a few tired cylinders. What happens is the unburnt fuel that doesn't slobber out the exhaust collects in the air box and when enough of it collects, all it takes is for the engine to be revved up quick and it will inhale it, and away she goes.
I used to see it at trucking companies that would use an old beater with a 671 or 8v71 for a yard tractor and it would idle for days, never get out of second gear and the temp hovering about 130 deg.
The first guy that goosed it across the yard would get the ride of his life for a few seconds.