combustion chamber... how your junk works

[KeithTurk]

http://www.youtube.com/watch?v=sEf8va1S7Sw&eurl=http://forums.sohc4.net/index.php?topic=45717.0&feature=player_embedded

[BOWTIE6872]

Re: combustion chamber... how your junk works

odd flame front..
intake valve must not be flush with the seat..
as each fire'n of plug.. there is a ring of fire around intake valve.
like raw fuel is on the outer edge of the valve head..

[JeffMcKC]

Re: combustion chamber... how your junk works

I have seen it before, and want to tell you Kieth, I would like to have the 2 hours I have watched it back. Thanks, that and the valve spring one rock !

[Caveman]

Re: combustion chamber... how your junk works

Dude, is it me, or is that intake valve actually spinning?

I thought it might be a wisp of fuel/air, but I saw it in the same place on the valve, and it went around 3x. Maybe that would explain the 'ring of fire'... just not quite seated...

[Freiburger]

Re: combustion chamber... how your junk works

Watch some of the valvespring vids and you'll see that, yes, the valves rotate.

What's amazing to me is how random the flame travel is. I'd like to see the same vid on a chamber with good quench. The engine shown seems to be a hemi with a flattop piston, probably a low compression Japanese engine? Anyone know?

[nosnerd]

Re: combustion chamber... how your junk works

i liked the valve float video....and the 20k cosworth dyno run...


cool...



al

[Caveman]

Re: combustion chamber... how your junk works

I wanna see a chamber with twin plugs...

And how they kept the camera lens from getting destroyed...

[fabricatordave]

Re: combustion chamber... how your junk works

this one is good to http://www.youtube.com/watch?v=_REQ1...eature=related

[TheSilverBuick]

Re: combustion chamber... how your junk works

Dude, is it me, or is that intake valve actually spinning?

If I remember right, commercial engine diesel's valves are actually designed to spin. I guess kind of like lapping the valves continuously to maintain the seal.

[DanStokes]

Re: combustion chamber... how your junk works

At EPA, they were trying to get an engine to run on neat (100%) methanol. They had a series of research engines with varoius combustion chamber shapes and variable CR - along with this equipment. I don't think the vids are available to the public, which is too bad as they were pretty cool.

I did not work on this project so I can't tell you too much about it, but I did BS with the guys so I know just a little. The answer to the camera lens question - there is a quartz window in the combustion chamber and the camera shoots thru it. How they get quartz to be optically inert I haven't a clue, but I guess they have to work it like glass. The window on ours lasted pretty well, but I'd guess that if the engine ran on Diesel or gasoline it might need more attention.

The photos are fascinating, I think. It's so cool to actually KNOW what goes on in a process that you THINK you know and understand.

Dan

[TheSilverBuick]

Re: combustion chamber... how your junk works

The answer to the camera lens question - there is a quartz window in the combustion chamber and the camera shoots thru it. How they get quartz to be optically inert I haven't a clue, but I guess they have to work it like glass.

My first thought was a quartz or saphire lens threaded into a second sparkplug (or drilled and tapped) hole. All glass is pretty much a man made version of quartz, some additives to make it harder or softer. Quartz is the purest form and probably the hardest (and fairly high melting point). Saphire is a lot harder and pretty much optically neutral. We use Saphire lenses on our rock spectral analysis because we put the lens right against the rocks and the Saphire is too hard to scratch but doesn't effect the optics.

[DanStokes]

Re: combustion chamber... how your junk works

I KNEW Randal would know!

Dan

[JeffMcKC]

Re: combustion chamber... how your junk works

Its common for the valves to spin to keep them able to seal over a long period of time

[CTX-SLPR]

Re: combustion chamber... how your junk works

Didn't the peanut port BBC heads actually have some sort of device on the exhaust valves to MAKE them rotate?

[Caveman]

Re: combustion chamber... how your junk works

yeah, BBC Mk Vs had exhaust valve rotators... under the spring... I shoulda popped 'em apart to see how they functioned... but they ended up in the recycling bin. Went with standard setup.