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Video inside combustion chamber

Originally posted by: spidey07
Nice vid. But I wanna see stroke 3 and 4 as well. 😉
Click to expand...

I don't get it, you didn't see that huge flame front, or exhaust valve opening? Or you meant you wanted it to be a better shot of the piston moving in the bore?
 
Originally posted by: Captain Howdy
Originally posted by: spidey07
Nice vid. But I wanna see stroke 3 and 4 as well. 😉
Click to expand...

I don't get it, you didn't see that huge flame front, or exhaust valve opening? Or you meant you wanted it to be a better shot of the piston moving in the bore?
Click to expand...

It shows the beginning of 3 and stops and resets to 1, you never see the piston come back to TDC and go back down.
 
Originally posted by: Captain Howdy
Originally posted by: spidey07
Nice vid. But I wanna see stroke 3 and 4 as well. 😉
Click to expand...

I don't get it, you didn't see that huge flame front, or exhaust valve opening? Or you meant you wanted it to be a better shot of the piston moving in the bore?
Click to expand...

I mean I wanna see stroke 3 and 4.

Still a very cool vid. You can see the vaporization of the fuel/air as it's drawn into the cylinder.

Such a simple function, such a simple motor, yet still a beauty.
 
So the valve opens and fuel gets sprayed. I suppose the explosion causes the cylinder to move down. What does the other valve do?
 
Originally posted by: zoiks
So the valve opens and fuel gets sprayed. I suppose the explosion causes the cylinder to move down. What does the other valve do?
Click to expand...

Lets the exhaust out.

By the way... explosions (detonation) are bad. What you see there, and what should always happen is a controlled burn... not a bang.
 
Originally posted by: spidey07
Originally posted by: Captain Howdy
Originally posted by: spidey07
Nice vid. But I wanna see stroke 3 and 4 as well. 😉
Click to expand...

I don't get it, you didn't see that huge flame front, or exhaust valve opening? Or you meant you wanted it to be a better shot of the piston moving in the bore?
Click to expand...

I mean I wanna see stroke 3 and 4.

Still a very cool vid. You can see the vaporization of the fuel/air as it's drawn into the cylinder.

Such a simple function, such a simple motor, yet still a beauty.
Click to expand...

I guess I still don't understand.

As far as I know, the Otto cycle goes, intake, compression, power, exhaust. As far as I can tell, all strokes are there although you cannot see the piston the entire time, it is quite easy to tell all the strokes, especially if you can see that degrees counter in the bottom.

From what I can see they are all there. Strokes 3 and 4 are power and exhaust, BTW, and if you cannot see those, then I think you really need to examine the video more closely. Yes the video seems to loop or something, but even from the poor angle it is clear all 4 strokes are there.

EDIT: ok, nix that, they do seem to cut the exhaust stroke off, but it is clear that it is happening when the exhaust valve opens.
 
Originally posted by: GTaudiophile
Looks like some simple POS American engine 😛

Show me inside a BMW M3/M5, V8/V10 or a Ferrari V8 please.
Click to expand...
Why? Combustion is combustion. It would look the same. Only difference would be, there might be more valves.
 
Originally posted by: spidey07
Originally posted by: Captain Howdy
Originally posted by: spidey07
Nice vid. But I wanna see stroke 3 and 4 as well. 😉
Click to expand...

I don't get it, you didn't see that huge flame front, or exhaust valve opening? Or you meant you wanted it to be a better shot of the piston moving in the bore?
Click to expand...

I mean I wanna see stroke 3 and 4.

Still a very cool vid. You can see the vaporization of the fuel/air as it's drawn into the cylinder.

Such a simple function, such a simple motor, yet still a beauty.
Click to expand...
You're only missing one stroke there, the 4th one. (Exhaust).

We see the intake stroke, the compression stroke, and the power stroke. Only stroke missing is the exhaust.
Intake is when the piston goes down and the air/fuel mix gets sucked in.
Compression is when the piston comes to the top and the mix gets fired.
Power is when it goes back down and the exhaust starts to open.
We never see the piston come up to TDC on the exhaust stroke.
The vid jumps to the piston already at TDC and is beginning the intake stroke again.
 
thats an awesome video for explaining how the combustion process of a 4 cycle engine works. you get to see every process is happening. and if you watch close enough, ignition does not happen at 0 degrees TDC, it happens slightlyt before it.
 
Very cool video.

Anybody know how you would do that?
My guess is that you drill 2 holes in the cylinder head - and seal them up with glass ( something that resists high temps and stays transparent ). Shine a light in one end and mount a camera to the other? Don't know why the camera was shaking though.

 
It does jump during half way through the exhaust stroke to the intake stroke. It looks like they probably fitted a borescope to one of a Hemi's spark plug holes. One plug is enough to fire it off, the second just helps to get more complete combustion.
 
Originally posted by: GTaudiophile
Looks like some simple POS American engine 😛

Show me inside a BMW M3/M5, V8/V10 or a Ferrari V8 please.
Click to expand...

It will be the same exact thing... only making less power at a higher RPM.
 
It would be neat to see the full cycle.

It is also neat seeing the flames start at the intake valve and watching the flame front spread out.
 
Originally posted by: Truenofan
thats an awesome video for explaining how the combustion process of a 4 cycle engine works. you get to see every process is happening. and if you watch close enough, ignition does not happen at 0 degrees TDC, it happens slightlyt before it.
Click to expand...

Yeah I was just thinking that, you can see the spark fire off well before you see a flame. Would have been cool if they had shown valve overlap as well so you could see how exhaust evacuation and intake work together to displace each other and maybe even the effect on the air stream with short and long intake runners.

Could even add a dye to the fuel/air and use their setup as a study bench to show the effects of head porting, quench distances, spark gap, and all kinds of stuff.
 
Originally posted by: exdeath
It would be really cool if they showed detonation in action, dunno how that would affect the camera though.
Click to expand...
Wouldn't hurt the camera. Detonation/Spark Knock/Pinging is simply the fuel getting ignited before the spark plug fires it.

Happens for several reasons: One is, carbon build up. If you have some significant carbon in the engine, it can stay red-hot and act as a spark plug.
Another is heat....heat from the engine and compression. Compressing a fuel/air mixture heats it up. If the fuel is too easily ignited (low octane) it can ignite that way.

This is also what causes "dieseling" or engine run-on, when you shut the car off.

 
Originally posted by: Gillbot
It would be neat to see the full cycle.

It is also neat seeing the flames start at the intake valve and watching the flame front spread out.
Click to expand...

You're just missing the last portion of the exhaust stroke...that said, it's weird that they didn't both including that portion of the vid. I can't imagine they didn't film it.
 
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