I'm trying to figure this ping thing out. IS ping or knock when you have to much or too little fuel in the cylinder. As far as i can put together it's when the compression gets too high and the mixture pre ignites. Is that the same as desiel then just not controlled? And then how does fuel octane work into the picture. does higher octane mean it can take higher or lower CR and what arre the other benefits of going with a higher octane fuel. Sorry but i'm just trying to get it all together at once cuase there is so much i'm confused thanks for the help.