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The Slow Mo Guys

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Offline Snowcrash Topic starter
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Molten Copper

Posted March 11, 2017, 11:21:27 AM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Data
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Not The Slow Mo Guys but ...

Posted March 23, 2017, 21:38:22 PM Logged

Offline Snowcrash Topic starter
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Cool. Even using acetylene, nutter. Interesting note, the plug sparks even on the exhaust stroke.
Posted March 23, 2017, 22:40:46 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

I've been following this guy for a few videos, and I'd been waiting for the final video of it running. Looks like they finally got it to run. Very cool!

@Snowy: Since small 4 stroke engines like that one only "fire" between compression and exhaust strokes (every other time the piston gets to the top), but have a simple cam and point ignition system, there is a spark with every revolution. Since the engine is between exhaust and intake strokes on this second revolution, that spark has no fuel to ignite, it can safely be ignored.

Pretty though, yes? Smiley
Posted March 24, 2017, 00:57:07 AM Logged
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Offline Data
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It must be possible to inject some fuel on the exhaust stroke then ignite it with the second spark, blowing some pretty flames out the exhaust, that should increase the efficiency of the engine by utilising the energy used for the second spark, I think.

Ok it's going to burn twice as much fuel but ... pretty  Cool
Posted March 24, 2017, 01:17:21 AM Logged

Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Sadly, No, Data. The downward travel of the piston is when the intake valve is open, drawing air and fuel into the cylinder. If there were burning air/fuel in the cylinder at that time, the pressure of the explosion would be greater than the pressure of the incoming air, and would cause the incoming air and fuel to burn, travelling past the intake valve, and sending the heat and flame of that explosion into the carb, causing that to catch fire and burn. A two stroke engine, with it's reed valves for intake and exhaust that ensure that flow of gasses only travel one way, can ignite fresh air and fuel on each revolution. Sadly, the only way to lubricate and cool these reed valves is by mixing oil with the fuel so that oil can coat the surfaces of the valves, and that creates a LOT of emissions that are bad for the environment. This is why two stroke (or 2 cycle) engines are banned in the US for a lot of applications (personal watercraft, for example), and are slowly being phased out.
Posted March 24, 2017, 01:26:35 AM Logged
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Offline Snowcrash Topic starter
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Quote
and sending the heat and flame of that explosion into the carb, causing that to catch fire and burn

Yep, I've seen that burn Data's eyebrows off. Fiat 131 Sport!!

The simple engineering solution is to have the plug spark on each revolution, I just assumed it would be on one, not both. A picture paints a thousand words.
Posted March 25, 2017, 10:46:01 AM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline DaveMorton
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Comfort the Disturbed! Disturb the Comfortable!

Posted March 26, 2017, 09:15:09 AM Logged
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Offline Snowcrash Topic starter
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Mmmm, rockets. It is rocket science.

They could've joined a club and had a bigger one. G is the largest without certification. Wiki.
Posted March 26, 2017, 17:33:31 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash Topic starter
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Nicely scented pellet entrapment.

Posted April 17, 2017, 08:42:30 AM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash Topic starter
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Pt 1 if you missed it.

Bullet proof Prince Rupert Drops Pt 2

Posted April 29, 2017, 12:14:46 PM
Last Edit: May 03, 2017, 20:53:36 PM by Snowcrash
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“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash Topic starter
England Global Moderator
Posts: 2738
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Pt 3

Posted May 03, 2017, 20:50:05 PM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Snowcrash Topic starter
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MouseTrap bouncing.

Posted May 13, 2017, 11:17:45 AM Logged
“I cannot remember the books I've read any more than the meals I have eaten; even so, they have made me.”

Ralph Waldo Emerson

Offline Carl2
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  Quite a few vids to watch since I haven't looked at these in a while, very interesting, keep up the good work.
Carl2
Posted May 14, 2017, 18:10:11 PM Logged

Offline DaveMorton
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Here's the latest one, done with the Blue Man Group:



Good one, that. Smiley
Posted May 18, 2017, 07:23:39 AM Logged
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