Coyote xs v 427

[Dimis]

Originally Posted by Hoity

Hey Dimis, you have got me.

How is it that all is not as it seems?

We measure using different scales.
USA uses AKI or something like that.
Aus uses RON

I can't quite remember the details. Google it for more info, but I recall researching this with my engine builder to ensure that when we built my engine compression and octane levels jived.

Thx

[Phill Pollard]

Originally Posted by Dimis

We measure using different scales.
USA uses AKI or something like that.
Aus uses RON

I can't quite remember the details. Google it for more info, but I recall researching this with my engine builder to ensure that when we built my engine compression and octane levels jived.

Thx

There are two ways to measure Octane ratings. The Research method and the Motor method. In the US we use the average of both combined (R+M/2).

In Oz, they use one or the other. If I remember correctly (IIRC), they use the Motor method which is the higher of the two.

Your 93 Oz octane gas is NOT the same as US 93 octane, far from it.


HTH,

Phill Pollard - Co. Spgs, CO
ERA #446 427 S/C

[fordracing65]

Our 91 octane in AZ is about 87 when tested, I had to mix 110 octane race at 5 gallons to mix with the 87 to get a 95plus octane it did not ping but I was down on power, that was the only drawback to the 11:1 compression...