Cooling fans and amp draw on WR450F
Posted May 25, 2011 - 05:57 AM
Posted May 25, 2011 - 08:41 PM
I made the bracket myself, it was quick and dirty but works just fine. Will probably do a cleaner one in aluminum though.
The fan is a SPAL brand waterproof 12V fan. While better than nothing, I don't think a computer fan is going to move enough air to really give you enough benefit to justify the effort. And also not being watertight (and likely made as cheaply as possible in china) I would not expect a computer fan to last very long in this type of duty.
If you are interested in the fan I used I can get you the exact model number and the current draw specs. Just let me know.
Posted May 26, 2011 - 05:13 AM
Posted May 26, 2011 - 05:29 AM
Posted May 26, 2011 - 05:40 AM
Is it just me or is there only one mounting bolt on the bracket??
No, there are three... in addition to the one you see in the picture, there is one on the frame mount bolt of the radiator (to the left of the fan, hard to see it), and the bottom one (the empty hole you can see in the picture) can't go in until the shroud goes on.
Posted May 26, 2011 - 05:45 AM
Posted May 26, 2011 - 09:34 AM
Specs are HERE
I got mine for $30 on ebay about a year and a half ago, there is one on ebay right now for $36 with free shipping
ebay item # 200609660461
Appears to be the same seller I got mine from.
Yea it costs more than computer fans for sure but moves a TON more air and will outlast a computer fan by a large factor.
Definitely happy with mine.
Posted May 28, 2011 - 05:09 AM
Thanks for the reply and the pictures. I was going to go with the computer fan because it was thin enough to fit in there behind the radiator without hitting anything. I do like your point though about it being water proof. Do you have a general idea of how heavy your fan is? I was thinking about mounting it with zip ties like the photos I found in this thread. http://www.thumperta...ight=fan on ktm I really like how cleans the install is without any type of fan shroud. I just have two concerns, will the zip ties melt and is the fan light weight enough not to bend the radiator fins. I think I might try that guys set up first because I already have everything I need on hand. I will post some pictures when I get it done. I would like the temp sensor but I think I will try a toggle switch first just to if the fan works well enough to cool the bike. If it does then maybe put in a temp control switch. I fhte computer fan don't work out then I'll scrap that idea and buy a better fan. Thanks for the replies everyone.
Posted May 28, 2011 - 06:36 AM
Unfortunately most anything that touches the fins will bend them. The idea is to keep it to a minimum. That mounting kit actually has soft spacers that will help keep the moving parts of the fan away from the fins.
Posted May 28, 2011 - 08:41 AM
As for weight I am guessing the fan is around half a pound, and the bracket somewhat less... maybe a quarter pound? Overall the whole setup doesn't add much weight considering the benefit.
I think the computer fan is better than nothing but it isn't moving much air. The SPAL puts out many times that airflow and not only quickly cools the bike down when needed it is able to keep up with the heat generated when the bike is not moving whether it is in traffic or jammed up on a difficult single track. In theory it could sit and idle until it runs out of gas and will not overheat. The fan uses 24watts at most so the stock stator can keep up with it and the battery does not discharge if the engine is running. The computer fan is cheap though and probably worth a try.
Posted May 28, 2011 - 11:46 AM
Posted June 01, 2011 - 05:26 AM
Posted June 01, 2011 - 03:38 PM
I'm probably going to wire it hot to start with to prove the concept then move up to the thermostat controlled relay. I may go with a switch but probably won't do a fancy mount since the ultimate plan is the automatic controller.
Ahh this is going to be a fun weekend.
Posted June 01, 2011 - 03:44 PM
SPAL has a thermoswitch kit with a wiring harness that will mate with the plug on the fan. It seems a bit pricey at $45 but includes everything you need to do the automatic control....
Check ebay # 390231281599 or search for SPAL 185FH Harness Kit
Posted June 02, 2011 - 05:37 PM
Posted June 03, 2011 - 06:20 AM
Can you remember what switch you used for controlling the fan?
I went yesterday to PepBoys and purchased a universal fan control $34. The kit is prewired with good instructions and was very easy to connect to the bike. It came with the relay and a thru-the-fin heat sensor which makes it easy. This way there is no worries about messing with the plumbing on the bike to insert a sensor that reads temps directly from the coolant fluid. All you do is insert the sensor between the radiator cooling fins to get the heat reading.
Anyway, I wired it all up last night and it works like a charm. It has a wire that goes to the ignition so you don't have to worry about forgetting to turn off an external switch. The relay itself is somewhat large but still works well. I originally thought to mount it under the seat near the battery with all the other electrical junk but it was too big. So I just ended up mounting the relay on the bracket where the AIS module used to be, the bolt holes even matched. The temp control also has an adjustment so you can kick the fan on anywhere from 170-210 degrees F. When I get home today I will post the exact model for the relay/sensor kit I bought and I'm also gonna figure out how to post pictures.
Posted June 04, 2011 - 06:38 AM