In-cylinder video footage

[shafty]

Cool vid alright; it's always been hard for me to imagine that cycle happening 166 times A SECOND at 10,000 rpm tho!

[*caution*]

Just two tiny fiber-optic fibers epoxied into a tiny drilled hole, one for the light and one to carry the image back.

So you were lying to us all earlier?

This is quite interesting, I wonder how they did it?....

[Steam]

So you were lying to us all earlier?

You're quick to accuse aren't ya. You must live in a sadly untrusting world. Too many steroids causing mood swings and paranoia?

I wondered how they got a camera to go that fast, as the engine would be cycling at 18 times a second at idling rpm of maybe 1100 and there are a lot of frames in one of those 18 cycles to get that slow motion, that adds up to a really really fast camera.
I was wondering if they perhaps synched the frame rate to the engine speed, (like 17 frames per second when then engine is going 18 cycles per second) and so got a film that was actually made up of lots of different cycles but of course looked like a seamless cycle. Which might account for the shakiness of the film.

[stanko]

good job you guys dont work at the tax dept

10,000 rpm is 83 cycles per minute

1,100 rpm is 9.16 cycles per sec

1 cycle take 2 revolutions or 720°

[Steam]

10,000 rpm is 83 cycles per minute

1,100 rpm is 9.16 cycles per sec

1 cycle take 2 revolutions or 720°

Let he who is without sin cast the first stone. John 8:7
But you are right, thanks for pointing that out.

[Ocean1]

Cool, clearest video I've seen. May have been shot through a quartz window, reasonably old trick. The high speed camera is impressive though...

[*caution*]

Too many steroids causing mood swings and paranoia?

Hahaha, classic....only when my dealer can't get me the good stuff!!

I've seen portable cameras that can shoot at 16,000fps, not sure what the fastest around could do, or the type you'd use for that.

[RantyDave]

This is quite interesting, I wonder how they did it?

Looking at how jittery it is I suspect they have a fairly vanilla high speed camera running very very slightly faster than the RPM of the engine. So each frame is taken at a very slightly different place in the combustion cycle, but on a completely different actual cycle. So 6000RPM = 100 per second so you'd need to take at about 100.5 fps. Easy with the right gear. Presumably they lit it with a strobe doing a similar stunt.

Must've been fun. I want to make one now.

Dave

[Wannabiker]

....thought they'd just used a really slow engine like a honda.....

[Mr. Peanut]

Fairly low compression engine too (or rich), yellow flame.

[stanko]

Let he who is without sin cast the first stone. John 8:7
But you are right, thanks for pointing that out.

Good spotting, but dont worry Im a Cathloic and we can have our sins wiped at a moments notice

[speedpro]

Something around 9000kPa of pressure and 3000K temperature, or 90 atmospheres and 2728C.

Depending on the fuel make up and quality, so that camera would have to be one serious piece of kit....

The cameraman would be a seriously "hard" dude as well, and a bit tiny.

[Steam]

Good spotting, but dont worry Im a Cathloic and we can have our sins wiped at a moments notice

Lucky bastard! I'm Buddhist and it takes about ten thousand lifetimes for us.

[Slingshot]

I wonder if you could cast an engine casing out of glass for the purpose of viewing the Otto cycle.

[Steam]

I wonder if you could cast an engine casing out of glass for the purpose of viewing the Otto cycle.

No: because as *caution* said "Something around 9000kPa of pressure and 3000K temperature, or 90 atmospheres" in an engine.
but if you just wanted a moving model, it sure would be pretty.
I will try to google it to see if someone has done it.