depends what typ of engine it is
4 rings....
At least one, could be many more depending on size of engine.
Worn engine rings or valves Worn engine rings or valves
about 1000 for them to set. But for full break in about 2500
A typical spark ignition (SI) engine usually has three piston rings per cylinder. These consist of one compression ring at the top, one oil control ring at the bottom, and sometimes a second compression ring in the middle. This configuration helps optimize compression, control oil consumption, and reduce emissions. However, the exact number of rings can vary depending on the engine design and manufacturer.
The cost to replace engine rings is at least $1800. The bulk of the price comes from the labor needed because the engine must be disassembled to remove the pistons in order to replace the rings.
leaking rings
bad piston rings Excessive engine wear - Rings, Valve guides, Valve seals
The rings are like a gasket between the engine and the pistons. explosions happen in the engine which push the pistons to turn the engine and keep it going. If the rings are bad the explosion escapes and doesnt push pistons like its supposed to and engine wont run.
It is time for an engine overhaul. The pistion rings/ oil rings and compression rings are either broken are worn out. That is called blow-by. Your engine is done.
2 compression rings and one oil control ( helps scrap excess oil off cylinder walls)
Running an engine with broken piston rings will cause damaging scoring in the piston chamber, and is not to be recommended.