Top Piston Ring

Install the dot toward the top of the piston.

Top piston ring.

In many engines these types of piston rings are used for the top and second compression ring. Some sizes still have the reverse twist taper faced design. Piston rings gas nitrided steel top martensitic ductile napier second std. These grooves are machined into the top ring land above the top ring to minimize contact drag when the piston rocks over upon reversal.

Molybdenum can take the heat better in most applications yet it is porous enough to hold oil for improved. Thick steel each part number. Contact reduction grooves reduce friction by minimizing piston material in contact with the cylinder wall above the top ring. There are two styles of torsional rings with inside bevels top inside bevel and bottom inside bevel.

Tension oil file fit for 4 030 in. In addition the second rings are reversed twist taper faced cast iron. If there s no bevel install either way in the top groove. If both top and 2 nd rings have a dot and your set has a coating the od will be metallic in color where as the 2 nd ring will usually be black.

Always check for the dot. During suction stroke as shown in the figure the rings twist slightly due to the internal forces produced by cutting away a corner of the rings. The top compression ring is generally made of ductile iron with a molybdenum face. Je pistons tells us its plasma moly ring package is an excellent choice calling for a carbon steel nitride.

Check the top ring for inside bevel and install bevel up. Total seal piston rings 900011 total seal m2 tool steel top rings piston ring m2 tool top 5 000 in. Top compression rings ucrs upper compression rings control combustion chamber gases allowing the piston to transfer the energy of the expanding combustion gases to the crankshaft. Bore 1 2mm 1 2mm 3 0mm set.

The second piston ring doesn t deal with the intense heat and pressure the top ring does. These rings also play a major role in the heat transfer process between the piston and cylinder wall. They also disrupt pressure spikes caused by detonation.