Author Topic: Water pump impeller compatibility with other models (Read 21425 times)

rablack21 · « **on:** April 06, 2015, 10:45:21 AM »

Does anyone know for certain if any other water pump impellers from a cr250 or cr500 will work on a 250R? Has anyone successfully used one? Just curious.

rablack21 · « **Reply #1 on:** April 06, 2015, 11:11:27 AM »

Perhaps even one from a 4 stroke might work. If that was found to be the case, maybe one of the high flow impellers would work.

rablack21 · « **Reply #2 on:** April 06, 2015, 02:42:19 PM »

I considered attempting to design a new water pump impeller. One that would flow more than the stock one does now.

jcs003 · « **Reply #3 on:** April 06, 2015, 05:30:32 PM »

Quote from: rablack21;52731

I considered attempting to design a new water pump impeller. One that would flow more than the stock one does now.

excellent idea!

John

rablack21 · « **Reply #4 on:** April 06, 2015, 05:33:08 PM »

I may pursue this idea. I have an extra clutch cover. I may have to enlist the help of others to come up with another water pump shaft and impeller. I would set up a bench test and measure the flow of the stock impeller. Then model up a few different designs and have a friend machine them and then test them.

broken1 · « **Reply #5 on:** April 06, 2015, 08:46:13 PM »

Basing it off the 89 would be the easiest because than you could use the 89 shaft & not have to worry about splines. You'd only need to redesign the impeller that way.

rablack21 · « **Reply #6 on:** April 06, 2015, 09:07:52 PM »

Guys, I need a little help. I need some pics of an 89 impeller, particularly the back side. Broken answered one question for me. 89 has no splines. I need to see if the rest of the back and the inner part look like my 85-88 impeller. I'm gonna start modeling up a new one tomorrow.

rablack21 · « **Reply #7 on:** April 07, 2015, 07:12:29 AM »

A couple pics of my first idea.

rablack21 · « **Reply #8 on:** April 07, 2015, 07:13:22 AM »

This one was modeled similar to the fins on Boyesen's super cooler kit.

JesseA420 · « **Reply #9 on:** April 07, 2015, 07:19:16 AM »

here is how dasa made a high flow impeller for a SxS. left is stock, right is high flow

rablack21 · « **Reply #10 on:** April 07, 2015, 07:28:39 AM »

Thanks for the pic, Jesse.I considered trying something like that as well. Yeah, I believe as you straighten out the fins, you are pushing more volume towards the out port. That pic helps a lot with ideas though. I may consider something like that as well.

JesseA420 · « **Reply #11 on:** April 07, 2015, 07:40:14 AM »

was doing some reading, perhaps the 90 degree elbow at the back of the head is turbulent restrictive spot also. it makes sense.

also, here is a side by side comparison from a yz450f stock impeller vs. its high flow boyesen counterpart. it seems they use the impeller to fully utilize the water pump cavity as much as possible

sameltoe · « **Reply #12 on:** April 07, 2015, 10:30:58 AM »

I was talking to a local engine builder o e time and he mentioned why not use a cr shaft, but didn't go I to details about it. Maybe I'll swing out there sometime an ask specifically.

rablack21 · « **Reply #13 on:** April 07, 2015, 10:40:06 AM »

If he knows that a cr shaft would work, that would be very helpful. I personally don't know. If you find out, let me know. Otherwise, I might go out to my local shop and see if he has any cr shafts laying around.

udontknowme · « **Reply #14 on:** April 07, 2015, 07:27:48 PM »

rumor has it that fast water speed and a smallish cooling system capacity works best. huge volume in the head is no good. seems like kevin cameron has talked about it