KX500 water pump modification

[Motorrad]

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/

pumping coolant through a system too fast is a myth...

[Sandblaster]

According to the book 02-08 CRF450R used the same impellers.
Here's a pic of a 05

05 CRF450R IMPELLER.png (503.48 KiB) Viewed 16089 times

It is the only one I have so I will check it out on Monday...
Thanks for the links.
I have more reading to do

[Sandblaster]

That article on cavitation is great reading
I have to cover some more of that article in a slower and more thoughtful manner..

[Sandblaster]

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 (141.18 KiB) Viewed 16085 times

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.

[Motorrad]

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.

Somthing I have been wanting to do.

is install a temp probe. instead of my Under the plug one that Digatron supplys.

Was thinking of welding a bung on the head, right at the output elbow...


just need to find a sensor etc that will talk to the digitron.

[Qsixteen]

Most of the Oem bike company's run close to the same rpm of the impellers, some are overdriven and underdriven depends on rpm of motor. Yes there are a lot of myths out there on cooling systems. Ist funny when you hear company's selling aftermarket radiators that have more cap. or bigger or have different tube sizes, and they only drop temperature 10-20 degrees. Most of the systems don't need different radiators to work. The Honda do have a better system then Kawasaki do, but the Honda do run hot too.

[Friar-Tuck]

Here's a link to the impeller mod for the '03 and earlier CRF 450's.
The problem was they 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/

[Qsixteen]

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/

Yes, you right when you are talking about a stock kx 500 cooling system. The kx 500 system is only good for kx 125 horsepower. The stock kx 500 impeller is the same in the 125 and 250 for older model motors. That impeller is good for 90 horsepower at the wheel in the right cooling system.

Wrong Deal

honda.JPG (266.57 KiB) Viewed 16070 times

[Motorrad]

Hmm never thought about the bolt head. Very good.....

[Sandblaster]

So the stock bolt is causing cavitation?
Makes a certain amount of sense....