mpgmike wrote:
…If an engine has an overly large squish pad, a groove (or 2) could
be used to vent the back side of the pad...
... If an engine has too slow combustion chamber activity requiring
too much timing advance, the action can be excited by strategically
placed grooves. By carefully studying the chamber and pistons,
grooves can be designed to help inherent deficiencies in the engine…
Mike
Mike,
Your thoughts about venting pressure with a large squish pad are
identical to mine. A very large percentage of the cylinder heads I
work have over 25% squish to bore ratio with most of the squish
area being on the opposite side of the chamber from the plug. During
combustion this area builds excessive heat and pressure that commonly
leads to auto-ignition.
Some people like yourself and I have realized that by relieving and
directing this pressure, increased burn speed and resistance to auto-ignition
can be easily achieved. As you know, this is something that can be proven with
out a dyno, it can easily be done by the average person with minimal skills.
Unfortunately the people that were involved with this type of thing years
ago in NASCAR have not come forward and shared much of what they
learned back then. It’s clear that they were able to prove no benefit with
what they were doing with that specific engine design and application.
I’m sure much of it was documented, it would be great if someone would open up.
Mike, you and Jessie as well as many others have a different desire, that
is to improve performance with out the need for expensive high octane
fuel. You and I have proven that it can be done. Despite the critics, many
others are quickly realizing the same!