[SX flowtest vs 450R] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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SX flowtest vs 450R
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Posted by: chad502ex

my flowbench was set at 28" H20, with zero leak using a intake manifold and 1" exhaust header manifold... my flowbench is pitot type, so it measures velocity...

the green vertical represents 0.25D of the intake valve, where the intake valve lift position becomes removed from flowpath and port begins to dominate... you can see where the intake port is limiting valve potential at ~0.300" lift... the left vertical scale represents CFM increasing every gradical 50cfm... the right vertical scale represents velocity in f/s...

The top orange curve represents the stock 09 KTM SX intake flow...

The top black curve represents the stock 04/05 Honda TRX450R intake flow...

The bottom orange curve represents the stock 09 KTM SX exhaust flow...

The bottom black curve represents the stock 04/05 Honda TRX450R exhaust flow....

The KTM intake side has a 11.5% (~27cfm) advantage over the stock 04/05 TRX450R at 0.25D for lift..

The KTM exhaust side has a 15% (~21cfm) advantage over the stock 04/05 TRX450R at 0.25D for lift..

Posted by: miles Machine

"the green vertical represents 0.25D of the intake valve, where the intake valve lift position becomes removed from flowpath and port begins to dominate... you can see where the intake port is limiting valve potential at ~0.300" lift... the left vertical scale represents CFM increasing every gradical 50cfm... the right vertical scale represents velocity in f/s."

Can you simplify this a little sentience more im confused, what does 0.25D mean?

Posted by: chad502ex

quote:
Originally posted by miles Machine
"the green vertical represents 0.25D of the intake valve, where the intake valve lift position becomes removed from flowpath and port begins to dominate... you can see where the intake port is limiting valve potential at ~0.300" lift... the left vertical scale represents CFM increasing every gradical 50cfm... the right vertical scale represents velocity in f/s."

Can you simplify this a little sentience more im confused, what does 0.25D mean?

0.25D = 25% the diameter of the valve

Posted by: miles Machine

so that is 25% of the intake valve diameter in lift??

Im kinda new to the whole flow bench thing and i want to learn about them and understand whats going on in the chart, I rele want to get one one day

Posted by: chad502ex

quote:
Originally posted by miles Machine
so that is 25% of the intake valve diameter in lift??

exactly! thats it.

Posted by: 400exrider707

Good info Chad!

KTM really built a great bike...

Posted by: RATPACK Z400

Hey Chad,so what your saying is the intake has 11.5 % advantange in flow over the honda and 15% more exhaust flow as well ? what do you think of these new KTM SX,s ?and when you getting one.HAHA

Posted by: chad502ex

quote:
Originally posted by RATPACK Z400
Hey Chad,so what your saying is the intake has 11.5 % advantange in flow over the honda and 15% more exhaust flow as well ? what do you think of these new KTM SX,s ?and when you getting one.HAHA

Haha johnny! I already have 67hp honda power. I doubt i need to change my colors to orange- Haha