Re: air - fuel ratio

On May 6, 4:51 pm, jim <".sjedgingN0sp"@[EMAIL PROTECTED]
> wrote:

>
> But octane is far more im****tant to fuel economy and performance. That
is
> more im****tant to how much energy goes to the wheels.
>

Not true.  Thermal efficiency aids BOTH performance and fuel economy.
A higher CR without detonation will provide more power without any
increase in fuel flow rate.

If we had higher octane fuels without serious environmental
consequences, we could have better fuel milage.  The higher CR that
modern fuels allow is one reason fuel milage is better on a ton-mile
per gallon basis than it was pre-WW2.