Thread: 302 Stroker??

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Originally Posted by jerry clayton

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!

Originally Posted by 34_40

...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!

I agree 100%. I took a class in college, Internal Combustion Engines, and one of the things we learned was that at a given timing setting you get the most power and highest efficiency with the lowest octane fuel that your engine tolerates without any pre-ignition "ping", and to clarify, "ping" precedes "knock" which is detonation. Back in the day when we had only two grades, "regular" and "ethyl", guys would pull in and say they were going to fill up with ethyl for more power, and actually the reverse was true.

Originally Posted by rspears

I agree 100%. I took a class in college, Internal Combustion Engines, and one of the things we learned was that at a given timing setting you get the most power and highest efficiency with the lowest octane fuel that your engine tolerates without any pre-ignition "ping", and to clarify, "ping" precedes "knock" which is detonation. Back in the day when we had only two grades, "regular" and "ethyl", guys would pull in and say they were going to fill up with ethyl for more power, and actually the reverse was true.

You and I took the same class!