Somender Singh Grooves are about creating more turbulance in and around the spark-plug gap, as well as an ignition path into the squish area.
Gadgetmen Grooves are about creating turbulance near the butterfly valve in a throttle body or carburator.
Although interesting, as the principle behind the two different types of grooves is so different; I feel that the subject of Gadgetmen Grooves requires its own thread?
