Reply to thread

Message: <blockquote data-quote="mlstrass" data-source="post: 5642937" data-attributes="member: 569126">higher the octane rating the slower the fuel burns. This is to help prevent pre-ignition/detonation in higher compression engines that build more cylinder pressure. Pre-ignition means the heat in the cylinder is causing the mixture to burn and not the spark from the spark plug. That's why you hear that horrible rattling sound when it happens as the mixture is igniting at the wrong part of the piston stroke.You're probably getting a more complete burn when running 89 octane and if you're not beating on the car then it's probably fine...</blockquote>

Top