Cool Video
 

Fascinating look slow mo inside combustion chamber:

http://video.google.com/videoplay?do...93860613&hl=en

Very cool!

Wonder how they did it? Like what camera could stand that and how'd they light the inside of the cylinder like that so you could see?

Neat!:eek:

so COOL!

:eek:

Pretty neat!

I watched a setup like this at Cummins Diesel back in the 70's--think it may have been the first HS movie of diesel combustion. I remember that the "engine" was brought up to speed, then fuel was injected for only one power stroke. Then everything was cleaned and done over. The movie showed that a drop or two of fuel was injected after it was supposed to be, causing much of the diesel smoke that was common back then. Injectors were redesigned because of it. I don't know what they used for light, but you didn't watch when it fired up. Very cool to see this with a spark ignition.

Bob Kelly

Quartz window?
 

A long time ago (early disco era...:)...), when I owned a 64 Lotus Elan, I had to buy a quartz spark plug to tune the two dual Webers. It was used to set the idle mixture, as the mixture changed, the color of the combustion in the cylinders changed ..... IIRC, it was good to 2000 rpm or so.

I guess they could put a similar quartz window in the cylinder head, and have the camera look through it....:)

It's a neat video...

gil A

Quartz and Saphire windows
 

Some of the early setups used quartz windows. Later they used synthetic saphire. Much tougher and stayed clean longer. My guess is the window was split in half for a light and lens. My Dad did metalizing of some of the early windows. (Attaching them to a metal tube that was screwed in like a spark plug) Very interesting stuff. There was a setup that had a strobe so they could photograph stuff like the oil flows in a bottom end. Very advanced stuff back in the day! Don't remember who it was that he did it for. Probably classified at the time. Circa 1970 or so I was just a kidd.
Bill Jepson

It appears that the intake valve is floating open at various times during combustion cycle, notably during the firing stroke when the raw fuel starts burning around the intake valve perimeter. Wonder if this is a turbo or supercharged engine?

I noticed that too - but I doubt it's leaking charge INTO the cylinder during the power stroke - the pressure inside the cylinder will be much higher than behind the valve. My guess would be possible raw liquid fuel (or a very stratified charge in a tight surface layer) on the valve lip from the intake stroke. Remember, we don't know the operating speed or temperature of the engine for this video - it could be at idle RPM with a cold engine with some choke, running a very rich mixture, which could allow fuel to condense from the intake manifold onto the face and perimeter of the valve.

Very interesting.
 

The exhaust valve opens while the burn is still happening.
Question: with the intake valve floating while the burn is happening, how come the burn doesn't go back into the intake manifold? Wouldn't the next charge of fuel be contaminated some?

Kent