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chad502ex
02-19-2009, 04:33 PM
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..

miles Machine
02-19-2009, 10:06 PM
"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?

chad502ex
02-20-2009, 06:23 AM
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

miles Machine
02-20-2009, 09:53 AM
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

chad502ex
02-21-2009, 12:22 PM
Originally posted by miles Machine
so that is 25% of the intake valve diameter in lift??



exactly! thats it.

400exrider707
02-25-2009, 10:20 AM
Good info Chad!

KTM really built a great bike...

RATPACK Z400
03-24-2009, 06:39 PM
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

chad502ex
03-24-2009, 07:01 PM
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

slipperyjake
07-10-2010, 01:24 PM
67 hp i doubt it! why do some riders exagerate? i have an ex paul winrow honda on my dyno yesterday and that only showed a true 51 hp at the wheels

tt racer
07-12-2010, 07:55 PM
He prob does but reliable no way i wouldnt want to check valves every half hour!

mx Eli
07-12-2010, 08:10 PM
I believe it too reliablity is out the window new crank every 10 hours hahaha

07-13-2010, 06:04 PM
all dynos are different i cannot stand it when people brag and boast about there dyno number and 67 isnt a rediculous number to believe

TWISTED
07-13-2010, 06:26 PM
You haters better check out Chad's history before you doubt him...... This isn't his first day doing this.....

400exrider707
07-14-2010, 09:10 AM
Originally posted by TWISTED
You haters better check out Chad's history before you doubt him...... This isn't his first day doing this.....

Exactly.


51hp is obtainable with bolt ons....

If we're talking stock bore/stock stroke, then 60+hp is still achievable with an all out build. Been done more than once.

tt racer
07-18-2010, 05:30 PM
Time Bomb 4 sure but if your racing the dyno its impressive but the race track D N F!!!!!!!!!! Sorry seen it for years!

djeurink
08-10-2010, 03:21 PM
Chad has a great reputation and is reliable. He did the head on my KTM450sx and it is awesome. I have raced it all year at the Nationals with zero DNF's and this thing pulls hard.

Smoker
01-23-2011, 01:18 PM
Knew a guy who had a CRF supermoto built by Yosh that pushed 70hp rearwheel.