Some of them are made of chrome molly but I'm shure there are other compositions as well.
The gasoline is avoided to go into the oil by few piston rings placed on the piston of the engine. Actually, the piston rings are made for this purpose only.
The piston rings create a seal between the piston and the cylinder wall.
As the piston moves up and down in the cylinder it also moves the piston rings up and down in the grooves. With the rings moving up and down it gradually increases the side clearence. Material is taken off from both the piston groove and the ring.
Gently, they break easily. They also make tools to R&R piston rings to avoid breaking the rings.
Oil rings Combustion rings Piston rod Piston rop cap
h22a motors are oil burners. most likely its the valve seals, or piston rings. in my case it was the piston rings though. the sleeves on the h22 is way to hard of material and it wears down the rings really fast. try some aftermarket rings if you plan on replacing them
The piston rings are fitted round the piston to make a better gas-tight fit in the cylinder.
Yes, the material, thickness and possibly style of piston ring(top ring) can be different.
Running an engine with broken piston rings will cause damaging scoring in the piston chamber, and is not to be recommended.
Mostly from cast aluminium.
It is a spring metal sleeve that goes over a piston to compress the rings so that the piston can be install in the motor. It tightens down on the piston, forcing the rings into the grooves in the piston then you tap it into the cylinder.
Worn piston rings, bad valve seals,