92 VS 93 octane

[nelson007]

I mix it 50/50 in my 67 corvette 427 to get it toi run correctly.
Bare oil sell it for $110 for 5 gal can in Westminster..
Nelson

[secondchance]

Originally Posted by nelson007

I mix it 50/50 in my 67 corvette 427 to get it toi run correctly.
Bare oil sell it for $110 for 5 gal can in Westminster..
Nelson

10 gallon is good for, what, back and forth to Bare oil for the next 5 gallon can?

[efnfast]

Marc tells me our engines are not octane restricted. 91 is fine.

[secondchance]

Originally Posted by efnfast

Marc tells me our engines are not octane restricted. 91 is fine.

Until you start playing with new pistons, liners, cranks and cams.

[efnfast]

Originally Posted by secondchance

Until you start playing with new pistons, liners, cranks and cams.

Ok, at stock compression 91 is fine. I carry octane booster with me in case I can't get 91 or better

[secondchance]

Originally Posted by efnfast

Ok, at stock compression 91 is fine. I carry octane booster with me in case I can't get 91 or better

I remember hearing that all cars sold in US must be able to operate with no damage with 87. However, most hi-performance cars and German cars will lose hp when using less than specified min. Octane.

[Paul Workman]

Originally Posted by efnfast

Ok, at stock compression 91 is fine. I carry octane booster with me in case I can't get 91 or better

The short answer is, YES(1). By the grace of advanced computer controlled FI, the computers and developments through the 70s and 80s, our cars have the agility to safely operate our 11:1 compression motors on 87 octane if it has to. IOW, the motors, thanks to modern computer processors and sensors, will operate in a much wider range of octane availability than in engines would in the days of carburetors and distributors (including running compression ratios at "nose bleed" levels (compared to the old days when lead free fuel was introduced).

Put simply: with active sensors and control, our motors will run at peak performance when high octane is available, but the computer will back off (timing primarily) if knock is detected as result of lower octane fuel.

(1) "Corvette Fuel Injection & Electronic Engine Management" by Charles Probst.

[Driller1]

Originally Posted by efnfast

I'd give up that one point for ethanol free

+1