two center cylinders?
- Thread starter 69chevydr
- Start date
suzuki4life
Banned
at what rpm?
mike1180
Banned
Good article here:
http://www.schnitzracing.com/manuals/TechArticle-HayaStacks.doc
In Summary:
Three lengths of velocity stacks are offered; 41mm (same length as stock Hayabusa short rubber stacks), 60mm and 72mm (approx. the same length as stock Hayabusa long rubber stacks). The long stack are offered as a set paired with a set of short stacks to match the stock Hayabusa setup but offer improved flow capability and torque. In addition, a tuner’s set is offered which includes 4 x 41mm stacks, 4x 60mm stacks and 2 x 72mm stacks, and one set of seals.
The optimum set up for your bike depends on the modification of the bike and your objectives. Some general guidelines are:
41mm stacks- Best used on highly modified engines long duration cams with 4:1 exhaust, where horsepower at high rpm is desired.
2 x 41mm + 2 x 72mm street stacks- Best used on relatively stock bikes where the stock torque band is retained but improved.
60mm stacks- A compromise between the former two combinations. Works well with stock bikes and modified bikes. It will provide improved hp in the mid to upper rpm band.
http://www.schnitzracing.com/manuals/TechArticle-HayaStacks.doc
In Summary:
Three lengths of velocity stacks are offered; 41mm (same length as stock Hayabusa short rubber stacks), 60mm and 72mm (approx. the same length as stock Hayabusa long rubber stacks). The long stack are offered as a set paired with a set of short stacks to match the stock Hayabusa setup but offer improved flow capability and torque. In addition, a tuner’s set is offered which includes 4 x 41mm stacks, 4x 60mm stacks and 2 x 72mm stacks, and one set of seals.
The optimum set up for your bike depends on the modification of the bike and your objectives. Some general guidelines are:
41mm stacks- Best used on highly modified engines long duration cams with 4:1 exhaust, where horsepower at high rpm is desired.
2 x 41mm + 2 x 72mm street stacks- Best used on relatively stock bikes where the stock torque band is retained but improved.
60mm stacks- A compromise between the former two combinations. Works well with stock bikes and modified bikes. It will provide improved hp in the mid to upper rpm band.
suzuki4life
Banned
your crank operates 1-3 2-4 in opposite rotation, but they are paired 1-2 3-4 in your airbox....to give the motor proper low end and top end, each pair of cylinders has paired stacks to allow one cylinder of the pair to get the best airflow at that rpm...
low stacks boost low end...short: top end.
if you look at a stock header, they are paired 1-2 3-4.
in brief terms, its about balancing airflow pulse and velocity.
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