KX Guru Racing

Friar-Tuck wrote:Hmmm.. spinning over 6-K,
I suppose if you were racing and had sustained high speed, you might have to come up with an alternative way to either spin the impeller,
or use a different design for sustained high speeds. (Like the auto industry)
If you could work out the cavitation problem with impeller design, you may be pumping the coolant too quickly through the system for the rads to adequately pull the heat out of the coolant at sustained high engine rpm.
Then you may have the coolant moving too slowly below 4- 6k if you were trail riding or cool down/ warm up between runs.
What type of riding are you looking to set the bike up for Q-Six?

SB,
“It is amazing how much can be accomplished if no one cares who gets the credit.” -John Wooden
Tuck\o/

Sandblaster wrote:Motorrad brought up a great point on gearing.
I use to design Pineapples for wood planers.
When a mill would want to increase planer feed speed one of the ways was to redesign the pineapples for higher gearing.

gearing.png

Changing the amounts of flutes, their angle, and web thickness had a dramatic effect on how fast they would feed.
So, on changing out impellers, you have a motor that runs at 11K and another that runs at 6K.
Swapping one impeller for another could reduce cavitation but it might also cut you flow rate
Got to be very careful.
I have a temp gauge that I will be installing so I know exactly where I am at.

Friar-Tuck wrote:Here's a link to the impeller mod for the '03 and earlier CRF 450's.
The problem was the were creating leaks in the seals, and '04 the problem was remedied by a different impeller design.
http://www.thumpertalk.com/topic/675240 ... eller-mod/

I agree, using an impeller that will work well around 6k and up may not move enough coolant at slower speeds.
To be continued...
Tuck\o/