hey read!!, well... Options

[jdmart]

on my celica i have a few mods and my cuisn tweaked with the timming a little bit and if u know what im talking bout the timming was set at 16 and it used to be at 5 and i noticed it gave it a lil more power and it kinda sounds a lil like its "caming". but it drives better and i have not noticed any problems at all..
what do u guys think about this i would like ur info......

[6strngs]

The air fuel ratio takes time to burn. if you light the spark plug at 10 degrees BTDC then by the time the mixture has finished burning you are probably around 20-ish degrees ATDC, this is your peak pressure and it actually pushes the piston on it's way down to help spin the crank which helps lift the other pistons up on their strokes and it just happens over and over. now, if you light that spark a little earlier and you can make peak pressure a few degrees earlier it helps push the piston down faster thus creating more power. You run into problems when you advance too far so that you reach peak pressure at 0 degrees or even BTDC so while the piston is still on it's way up, the explosion pushes it down and the piston has to fight against that extreme force. this is detonation and will kill an engine pretty quick.

But, a gasoline's octane number tells us it's ability to resist detonation so the higher the octane, the less chance of detonation which is why it's safer to use a higher octane when advancing the timing.