Plugs

[Sixpack]

Pulled the plugs out the car today and the ceramic below the electrode was orange any ideas why? plugs looked okay did a compression chk also number 3 cyl was at 125 psi the others were 135 -130 the plugs got me stumped?

[Steve Wood]

You been putting octane booster in the tank?  Which is a waste of money btw

[Sixpack]

actually been using race fuel leaded stuff

[Steve Wood]

the it is an additive in the gas...old age is getting to me but it is something like MMT or such...turns the plugs red

[tb3]

Steve,  If  your chip/tuned for, say... 91 ocatane, and your highest octane option at a out of town gas stop is 89.  Might a true octane booster put you back (or close) in the safe zone for boost?
I don't know, is why I'm asking. 

[Steve Wood]

Nope.... octane boosters typically increase octane about 1/3 of a point...so 89.333

with a modern chip reduce the timing a couple of degrees would be the better idea

[tb3]

dang it!