Not only is this video cool as hell because it is actually showing the events that go on inside a combustion chamber of an actual running engine, but also because it does so in slow motion. How in the hell the camera lives for this we don’t know, but we certainly dig watching it! In our world this is an early Hemi that they are recording, because we don’t want it to be a dual overhead cam 4 banger. Ha ha ha.
At any rate, it is super cool seeing the intake valve open and the fuel and air come rushing in, the piston coming up and the spark plug firing, the flame front starting and pushing the piston down, and then the piston coming back up as the exhaust valve opens. It really is a cool demo of what is really going on inside your engine.
guys, please index your spark plugs
Unless this is in a mild street car and they don’t care about squeezing that extra 1% out of it…
Is there proof that they didn’t? Some engines do prefer the gap to be towards the exhaust valve, so I don’t think you can assume they didn’t just based on that. It’s the Internet though, everyone needs to always seem smarter than everyone else.
Says the guy that’s probably never gone fast. We’ve built 100 cars making 2000+HP and never noticed a difference indexing. Don’t waste people’s time 😉
Everyone has built the biggest and fastest cars on the internet, its easy to say so when you don’t have to prove it
It’s about improving the efficiency of the engine. You burn more of the air fuel mixture resulting in more power, more torque, more throttle response, lower emissions and better fuel economy. As inefficient as internal combustion, 4 stroke engines are any bennefit is felt, stock or modified. The only downside is time. Even doing this to a 4 cylinder can take 30min to an hour to do it right. If you run any form of class racing, weather it be road racing, drag or autox you should be doing this. You will feel a difference and wonder why you’ve never done it since
Wow, that’s really wild…interesting that there doesn’t appear to be any overlap between the valve openings…
I noticed the same thing. If you look close you see the video jump a little. I think we’re looking at repetitions of a single event that didn’t show the overlap occurring.
It’s edited for the money shots – cutting out half of the 4 stroke action.
First – excellent video – possibly from an engine with twin plugs originally and one replaced with a fibre-optic probe for the camera.
Second, it would be interesting to see the effects of indexing the existing plug back 90 degrees at first, for maximum spark exposure to the mixture, then again for maximum spark exposure to incoming mixture at inlet valve – possibly with a Dyno hook-up to measure any actual variations.
Perhaps this would help answer the Index or Don’t Index question – once and for all
Why not enjoy it instead of finding fault ! Not likely get a chance to see something like this in real time.