why would you mess with compression ratio???

 

no, 87 does not make the engine burn cooler. Dont ask me how or why because im not a fuel scientist or a chemist.

I have been told specifically by many mechanics in the area to not run lower than 89 in my raptor.
I also have some proof from a professor and fuel researcher.

Read the top article

so i always run 93 in mine. Do what you want though, this is just what i KNOW.

 

"<u>Remember Higher octane gas actually burns SLOWER or cooler then lower octane fuels. Using this will cause the fuel that is not being burned to build up in your heads,valves,pistons, etc...... So the trick is not what you think is best,but actually matching the octane to what your timing, ignition, and engine can actually burn in the compression stroke.</u>Another collage of fuel facts

The higher the octane the slower and cooler then burn, but it may not be right for the motor as everyone said. The higher octance burns slower and leaves deposits in the motor which could lead to problems down the road. I might have to bhgack down to 89 also after reasearching a bit here.