Suck, Squeeze, Bang

Post by **MarkyB** » Thu Oct 11, 2007 9:24 pm

But not much blow for some reason, maybe the camera technology.
Still makes interesting viewing

http://gizmodo.com/gadgets/fourstroke-a ... oplay=true

I suspect it is running a bit rich from the flame colour.

I'd like to see the same done a diesel engine and a fuel injected one too.

Post by **bmcecosse** » Thu Oct 11, 2007 9:45 pm

Excellent - I like it! Can actually see the spark at the plug just before the mix ignites. Thanks for posting the link.

Post by **Alec** » Fri Oct 12, 2007 7:22 am

Hello all,

I had seen this elsewhere. There appears to be a normal to lean combustion initially but then a yellow (rich looking) burn following, could that be some oil in the inlet tract as it appears from the inlet valve?

Alec

Post by **chickenjohn** » Fri Oct 12, 2007 8:08 am

Yes, the video proves that the phrase should be "Suck squeeze BURN blow", the "bang" bit is incorrect unless a diesel engine. Even then its more of a bang burn than a bang.

SUCK SQUEEZE BURN BLOW.

Petrol engines do not explode (unless you have pinking) thats why they sound different to diesels.

Post by **LouiseM** » Fri Oct 12, 2007 8:18 am

the phrase should be "Suck squeeze BURN blow", the "bang" bit is incorrect unless a diesel engine.

Best get some new t-shirts printed Andrew

Post by **chickenjohn** » Fri Oct 12, 2007 8:31 am

If you looke closely at the video, I think there is a reason why the "Blow" bit was not shown. The clip shows the same sequence repeated over and over. I think the camera inside the engine did not survive the first exhaust (blow) stroke of the engine. Probably the hot gasses under pressure as the piston rose destroyed the camera. Hence they only captured part of one combustion cycle before the engine destroyed the camera.

Interestingly you can see the fuel/air mix burns all the way down as the piston is pushed down by the expanding gasses.

Post by **alex_holden** » Fri Oct 12, 2007 8:38 am

Judging by another thread, maybe it should be "Pushed in by atmospheric pressure, Squeeze, Burn, Sucked out by atmospheric pressure."

Post by **chickenjohn** » Fri Oct 12, 2007 8:45 am

No, because the piston is doing the work in the sucking and blowing, the atmosphere is (mostly) constant compared to the changes of pressure and vacuum due to the movement of the piston. Although density of the air can play a part- so your car will perform marginally better at sea level in a high pressure zone than at altitude.

Post by **alex_holden** » Fri Oct 12, 2007 8:52 am

I agree - see the "Get those brain cells working" thread.