Y in Pistons

[JerrryR]

Hi All,
I bought some 57XL cylinders from a guy and they came with some pistons. I was curious why someone would grind the “Y”s in the top of the pistons? Hope all is well with you and yours.
JerryR

Piston Cropped.jpg (134.67 KiB) Viewed 6857 times

[mikeslemmon]

spark ..channel?

[wz507]

Somebody's better idea to assist the combustion process! Perhaps peripherally related to the Singh squish grooves.

[hayleyl]

Hello all - looks like someone's crude attempt to try and concentrate fuel/air charge to the middle of the chamber. Simple solution - twin plug. Interestingly Ducati have twin plugged their latest 1299 Panigale - more horsepower while using less fuel. Funny how sometimes we need to look backwards to move forwards in our digital age. Cheers Hayley.