Originally Posted by beemerrich
I hear where you're coming from Agro...for about $35 per pair of velocity stacks and $100 of dyno time, I can test all 4 of the RS velocity stack lengths for my machine for less than $250 and have a induction length tuned to my motor's exhaust/cam timing.
My personal experience reflects your result, which was dialing in the tuned intake length ws beneficial in backfilling a hole in the midrange. It did nothing for me up top on either the CVKs or on the CR carbs.
Yep, midrange torque rules!!
Long stacks will fill in holes that the 2 into 1 creates. Also long stacks will fill in the holes big cams with long duration and large overlap like the 813, Irrespective of carbs used, CR, FCR, CVK.
By the way Rich, what main jet size were you using with CVK's stacks and Uni pods?
Had 135's now @ 150's, think it still needs more?
Have tried smooth and polished 790 manifolds with 50mm and 70mm stacks with 135 mains 42 pilots. The 70mm stacks felt good with this main.
Today tried 865 manifolds, no spacer, 50mm stacks, 150 mains, 42 pilots, felt very strong in the mid range.
Tomorrow, will try this combo with 70mm stacks.
Then i'll try the polished 790 with 150 mains and the 50mm then 70mm stack
Should get me a smart phone and get the "Smart Speedometer" app.... I'm having way too much fun...