Crossover shim

Bandit9

Member
Jul 14, 2002
449
0
What role does the crossover shim stack play? I am playing with my base valve stack and I am just learning about stuff and this has me confused.

Thanks
 

georgieboy

Member
Jan 2, 2001
416
0
you haven't done a search on this?
Crossover shims gives the stack above it a free float, untill it hits the stack below. Thicker crossover, more room to bend etc. It is a tuning device for the slower shaft speeds mainly.
 

bclapham

LIFETIME SPONSOR
Nov 5, 2001
4,340
0
shim stacks come in stages- no crossover is a single stage, 1 crossover is a 2 stage stack- it enables the tuner to separate both LSC and HSC (to a degree).

for example, the rm125 has a 2 stage passive valve stack- by swapping the 10.1 crossover to a 12.1 i was able to increase the LSC and leave the HSC somewhat the same.
 

Bandit9

Member
Jul 14, 2002
449
0
Yeah I searched it and didn't really come up with much. Thanks for your replies.
 

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