Quote:
Originally Posted by Jesse Lackman
For the first time I understand how grooves aimed at the exhaust valve might
help inhibit reversion.
Did that car have a full exhaust?
So using grooves to limit reversion at idle or low RPM/low throttle would limit
their effectiveness at doing anything good at WOT right?
(Thinking) - if there is no reversion at WOT why waste the groove for reversion
control? 
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How would the grooves aimed at the exhaust valve help with reversion?
This car runs open headers, 11:1 compression premium Exxon gas. The reason
I tried the grooves pointing towards the exhaust was to direct squish action
in the hot area where the flame develops, aganst the grain of swirl generated
in cylinder flow. I didn't consider reversion.
Quote:
Originally Posted by crazyman
Looks like melted aluminum specks. Did it sound like it spark knocked?
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I'm thinking the roughness on the piston is from high humidity. The engine didn't
show signs of detonation, I'll check the piston tops for damage. The plugs
were running snow white with a slightly rich Air/fuel ratio, no signs of speckles.
