i have a vishnu main power pulley and i have no problems with it.

 

remember what the end result would be from long term use of a critically underdamped crankshaft:

a) fractured/broken crankshaft
b) damaged main bearings
c) damaged conrod bearings
d) fractured/broken connecting rods

i haven't seen ANY of these problems directly correlated with aftermarket (ud or lw) pulley use. in fact, just about all of the ej20 failures seem to be piston/ringland failures, and just about all of them are in cylinder #4.

fwiw
ken

ps 15k miles on a GFB set, txs stage 2.5.

 

Have you thought about a lightened flywheel instead?

 

Yes, but I think that I want to do the pulleys instead.