I Think I taw a flame out...

Tthos afternoon I put my faithful .32F on the bech, just for the heck of it.

I used the venturi Scott Riese made for the .25 VF.

I think I choke primed it too much, and when I flipped it, there came fire out of the exsaust. It was unmuffled.

What is this flame out and what causes it?

BTW, that .32 is a mean cottonpicker! When it started is ws a little sean, and it went to something near 18,000 rpm!

It started pulling the test stand. The last bugger I saw doin'this was a ST.51!

Your'e kidding, right? The glow plug sets the fuel on fire, it burns rapidly, expanding all the while, creating high pressure which pushes the piston down. As the piston goes down, it opens an exhaust port. The fuel burns at a given rate based on the amount of fuel to air ratio at the time it is ignited. Since the fuel mixture was rich, more fuel than oxygen, it all didn't burn in the time give for the piston to move down, and the still burning fuel came out the exhaust like it is supposed to.

Even when not rich there is still unburned fuel when the exhaust opens. This is the reason a glow 2 stroke sounds so much louder than a diesel 2 stroke.

In a test on a pipe system the hottest point of the exhaust was found to be about 1.5 inches into the header it was 100 deg F higher than at the exhaust opening.

Hmm.

Either burning fuel or a sign from God.

Cy

Cy,

That was the burning bush, not the burning bench.

"Flame out" usually means the flame being extinguished inside the engine, and the engine ceasing to run. I was going to fly stunt at the '80 Nats but did not do so because I caught my airplane on fire in practice and damaged it beyond immediate repair.

As said, in a model diesel engine the fuel-air mixture detonates inside the chamber, and the exhaust which comes out is not burning, but expanding and cooling. You can get your finger pretty close to diesel exhaust without getting burned like you would with glowplug.

LOL
Ion