With all due respect.. above in Red..This is not correct...Detonation has nothing to do with the spark nor is it set off by the spark.. It does occur AFTER ignition.. But detonation is the result of 2 colliding flame fronts. This is due to a rapid pressure rise in the cylinder that will ignite the F/A mix with NO SPARK.. This newly ignited F/A mix starts a 2nd flame front. This 2nd flame front collides with the oncoming spark ignited flame front (the one that you want) and this COLLISION is the detonation.Arizona Shorty wrote:
Second thing: detonation isn't caused by hot spots. That would be pre-ignition. Detonation is a flash burn started by a spark plug at the right time, flame spreading at a given rate, and then something upsets the balance, usually in the squish band, and the flame front goes from sedate to exponentially fast. That flash bang is detonation and it beats the starch out of engines. The something that sets it off is usually low octane, moderate engine speed, too high compression for the gas in use, and lots of throttle. As engine speed rises to near redline, detonation recedes. Detonation one thing, pre-ignition another. And there is no such thing as pre-detonation, which term has not been used here, yet, but has been used in a lot of other places on the net. Just wanted to nip it just in case.
Oh, and all seizures are caused by breakdown of the oil film on the piston/cylinder wall. What causes the breakdown is variable, but unless the oil breaks down, nothing seizes. That's' three things. Sorry.
Y'all can go back to the running discussion.
As for the 1st law of thermodynamics... I do not see how that is up for debate?
The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed.