How Motorcycles

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connecting rod split connecting rods the oil spurt hole sprays oil onto the cylinder wall when the hole in the crankpin journals lines up with the spurt hole in the connecting rod 2 times every 360 degrees oil spurt hole some connecting rods use these wrist pin hole connecting rod bolt most motorcycles don't use spurt holes in the connecting rods instead they use oil nozzles drilled into the crankcase that spray oil onto the cylinder walls and the underside of the piston nut connecting rod bolt bearing inserts not all connecting rods use bearing inserts ghost view showing rod bolts nutless connecting rod bolts threaded into upper half of connecting rod connecting rods are usually made from high strength steel because of the pressures and reciprocating forces they must endure some specific focus applications use aluminum connecting rods for their shock absorption capabilities drag race motorcycles using nitromethane race fuel similar to NHRA top fuel dragsters performance connecting rods made from titanium offer a performance increase because of their lighter weight also they do not expand under thermal stress which can allow performance tuners to mill the head shave off material to increase compression ratio h-beam i-beam small hole in wrist pin bearing plane of section h-beam i-beam cross section i-beam type connecting rods are commonly used by oem h-beam type connecting rods are made by aftermarket companies for high performance applications