Quote Originally Posted by jerry clayton View Post
Pistons are dumb----------------


The issues of timing------------people talk about degrees of timing before top dead cender---it actually comes down to Time ( you know, one of them absolutely constant values, like gravity????) If spark could be set by time in milli seconds, you could run many more degrees of timing ----


Reason we are limited on the street to more restricted numbers with the lower quality fuel is it burns much faster (ever noticed how often you got to stop for gas?) and with the timing numbers we run for midrange(to me that's low range--) there is more time for the fuel to burn and reach that pressure point at say 2000 rpm than at 8000 rpm----------The reason we can/need to run more advance for wot operations is to enable the flame front to reach that sweet spot for the flame/pressure front, piston/rod/crank angles, etc which ironilly is past top center on the way down------------
And that's what we call the "OTHER 359" degrees!
Also, gas with a lower octane number doesn't mean it's of a lower "quality", but it does burn quicker for a shorter power cycle. And many vehicles actually achieve a better mpg on a lesser octane rated fuel!