[John Rogers]

A scored cylinder in anything will result in what the seal is trying to keep sealed to leak by. It can be compression, oil, hydraulic fluid, water, steam, etc, etc. It can be caused by several things: metal on metal wear, contaminates in the oil/fluid, poor clearances, over heating that damaged the metal, etc, etc. It can be caused by casting sand that is not cleaned out well and it contaminates the internals.

At a vintage race at Palm Springs years ago a Can-Am car with a big block Chevy and those big 'ol Hilborn injector stacks was sucking down lots of sand every time it ran! By the last race on Sunday it looked like a mosquito fogger with the plume of smoke out the back........rings were toast!