At 08:09 AM 12/19/1999 -0800, you wrote:

>If I install a high compression inline four with a 'knock sensor', can I
>burn 87 octane fuel or  will 92 octane be required?   Will the 'knock
>sensor' intervene to eliminate engine predetonation with low octane
>fuel?  Thank you.

Dana, that is what the knock sensor is there for. I would seriously
consider what the owner's manual for that engine recommends as the minimum
requirement for octane rating and stick with it.

T.P. Stephens aka Doktor Tim
Surveyor, Mechanic, Poet, Philosopher
San Juan Island, WA