B-Motor Right Spherical Bearing 72mm

TYPICAL:   Anytime we make the motor perform more than OEM design limits we expect failures. Our Super Twin Cam motors need a super strong crankshaft and crankcase assembly.  The stock "A" motor uses a 72mm with 12-roller bearing and the "B" motor uses a 62mm 14-roller bearing. 

PROBLEM:   High torque motors put extreme downward force to the crankshaft pin causing the flywheels to spread apart.  This flapping of the flywheel creates extra vibration and must be held firmly for minimum vibration.   However the left primary side is held by two timken bearings, but the right pinion side is allowed to slide axially along the roller bearing for thermal expansion.   

SOLUTION:   EMC installs a Spherical 72 mm bearing with two 32 barrel shaped rollers into the right case of  the "A" and "B"  twin cam motor.  This spherical bearing supports both radial loads and axial load.  At power stroke the flywheel is now held firmly axially and radially on both sides of the flywheel.  EMC assembles the crankshaft with .005" space on the timken side and no space on the pinion side which allows for .005" axial differential thermal growth. 

B-Motor:    In the cam side view of the "B" motor one can see the retainer ring.  This ring is 1/8 thick and grade 8 hardness with (4) 10-24 socket head screws holding this ring.