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Crossover shim
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Posted by: Bandit9---------------------
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
Posted by: Bandit9---------------------
I meant to say "crossover shim" but I can't go back and edit.
Posted by: georgieboy---------------------
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.
Posted by: bclapham---------------------
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.
Posted by: Bandit9---------------------
Yeah I searched it and didn't really come up with much. Thanks for your replies.
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