#91238, "RE: 600HP!! WOW" In response to In response to 8 Jul-08-05 02:31 AM by cougar694u
Originally posted by grain um... please check dates on posts before responding
At least you know he's using the search button
Originally posted by Talon96 If I remember right, detonation happens when gasoline preignites before the sparkplugs spark the a/f ratio, and it heats up the internals and shit, and you knows what happens when something heats up beyond its limits. Higher levels of octane in gasoline help fight detonation. That's how the cars in JGTC and shit run high amounts of boost. Lean a/f ratios cause detonation also, but just use higher octane gasoline and dont run too lean. Also, detonation/preignition can bend your connecting rods and may fuck up the cranshaft because as the piston is going up to compress the a/f mixture, it will explode. This will cause the crankshaft to spin in reverse, but the other cylinders would still be firing properly so thats like sticking your hand into some fanblades.
Wrong. Gas igniting prior to spark is preignition, not detonation. Preignition is very VERY bad and can waste a piston the first time it preignites.
Detonation is when not all of the gas is burned evenly, a small pocket inside the CC that is unburned is heated due to compression & the main a/f mixture burning. That unburned pocket of air/fuel spontaneously combusts. That's why you hear that rattling noise, it's very powerful, increasing cylinder pressure for that split second, and jars everything internally like hitting it with a ball peen hammer. Most engines can withstand a small amount of detonation for a short period of time. It's prolonged exposure to detonation that kills internals.
