That's a quality post. I'd love an engine that's been cut open so you can turn it over manually and see everything move. I've seen a Buell one and it was artwork Something like this (i know this isn't a Buell, lol): Live Forever or Die Trying
This might be totally off, but I guess someone got a multi cylinder engine, built up the revs on all but 2 cylinders so they could film the valves on those? Live Forever or Die Trying
If that was the case wouldn't the valves just be sitting still? If the cylinders being filmed are not firing then how are the valves moving? (I know very very little about engines - so I might be asking silly questions).
I don't know a huge amount either, so please someone correct me if I'm wrong.. But... All the values are operated by the cam shafts, and all the pistons are all connected via the crank... If you take a piston out of one of the cylinders, everything else still carries on, just with less power (and no doubt more long term problems.. But for the purposes of a quick video)... Hopefully this helps.. It's obviously an inline 4 engine with two valves per cylinder.. All valves for every cylinder are operated by the 2 cams (intake/exhaust) on top http://www.carbibles.com/images/enginecomponents.jpg Live Forever or Die Trying
I see. I thought somehow the valves were operated using the combustion (so the explosion opens the exhaust valve, and the piston going back down would somehow open the inlet valve). Your version makes more sense though so you're probably right. I need to watch more videos haha
oh no that particular bit I'm sure about... If the exhaust valve opened merely due to pressure in the cylinder then it'd open during compression and let unburnt fuel/air mix escape Live Forever or Die Trying
In fact, I think the second video in the original post shows the cams operating the valves Live Forever or Die Trying
When I used to be an NCO in the air cadets as a nipper we had to teach the young uns various things to upskill them, and one was the basics of the Otto 4-stroke combustion cycle (intake, compression, combustion, exhaust). To do this we has an A-series engine from a Mini, cleaned up, fitted on a stand and cut open. A small electric motor was fitted to the crankshaft output and when turned on would rotate the engine and all it's moving parts. It was an amazjng learning tool. Like people have said, so long as the moving parts are held firmly and the cambelt/chain is still fitted, everything will move no problem. The pistons are pressed down one at a time by the expansion of gases in the combustion chamber as they burn, the piston (via the conrod) pushes the crankshaft round and the crankshaft turns the gearbox. The camshafts are tied to the crankshaft with a belt or chain that ensures that they turn in synchronisation with the crank. Beautiful symphony of mechanical parts
