Most V engines have each pair of cylinders sharing a crankpin. However, many V engines have each crankpin shared by each pair of cylinders. This precludes the use of oil pressurized plain main and crankpin bearings. The WHE-25 is designed with six connecting rods sharing one crankpin on the crankshaft. Crankpin and crosshead bearings carry small cup-shaped reservoirs for oil. The most common configuration is for a crankpin to serve one cylinder. Most V-twin engines have a single crankpin, which is shared by both connecting rods. Some V-twin engines use a single cylinder per crankpin. Aero models are single crank-pin models, all other 1100s are dual crankpin. The crankpin connects to the larger end of the connecting rod for each cylinder.