Hello everyone,

there is a BIG misunderstanding about the silicone insert in crankshafts.

This insert is NOT put there to enhance performance!!!!

When an engine is modified (as in JP, Murnan,etc) the crankshaft is drilled out (towards the clutch) to make it lighter. The whole needs to be closed to keep crankcase volume consitant. Here is where the silicone is used. It does build a ramp that might help with gas flow, but that is NOT the primary reason to put it in.

Smearing silicone into an un-drilled crank is crap and won't do anything!