Quote:
Originally Posted by BCT748  There is only one real reason not to use lower octane fuel in higher compression motors, knock. The higher the octane the more resistant it is to detonation. Lower octane fuels can detonate in high compression motors just because of the heat produces by compression, like a diesel. If it does this the expansion from the detonation can cause the piston to be pushed down before it has completed the compression stroke. Which in turn can cause the motor to jump time or parts to break. Using high octane in a motor that has low compression is bad too. Because the motor was not designed to burn as hot you may not be burning all of the fuel in the cylinder which can result in lower MPG, loss of power and carbon build up. |
very concise, and exactly right.
i run 87 in my Bandit