Author Topic: electric cooling fan (Read 16740 times)

Jerry Hall · « **Reply #15 on:** June 18, 2014, 08:05:28 PM »

Quote from: aberegg05;37032

Where can I get a rectifier and what type of battery do I need. Of course I want as small as possible.

rk88r gave a link that has voltage regulator and rectifier in one package. You will need a 12 volt battery. The battery size depends upon how long you are going to idle around with the fan and lights running.

Bio86 · « **Reply #16 on:** June 19, 2014, 08:23:46 AM »

I used Ricky Stators single phase rect/reg, I think he'll float the ground on the stator for you if you buy one from him. Pretty simple though. I use a like 3"x3"x5" 12v mounted under the tank. Not positive on dimensions but I can measure it later.

Bio86 · « **Reply #17 on:** June 19, 2014, 08:25:33 AM »

http://www.rickystator.com/catalog/single-phase-rectifierregulator-p-88.html

Grande huevos · « **Reply #18 on:** June 19, 2014, 11:57:23 AM »

Save yourself time and headache and buy an Afco radiator! It will solve any Heating issues out there. I put one on my 330 with engine ice and it instantly dropped my temps 30-40 degrees. I ride xc in the thick woods and usually say around 150* and never break 175* no matter the outside temp.

. If I were going to run a fan I definany would not try to run it off the stator and if you have cr ignition like me then that's not an option anyways. I would get a good 12v battery and make some sort of mount to set the battery on the frame down by steering stem. I think it would be most stable there and would have easy access for recharging.

wilkin250r · « **Reply #19 on:** June 21, 2014, 04:04:31 PM »

I'm thinking a 200W stator will actually be WORSE.

I could go on a whole long-winded post on how electricity is generated, coils of wire, electric fields, shunt regulators, and the differences between 20V and 10amps, or 10V and 20amps. (same overal power, different delivery)

But the real heart of the matter is that high-output stators suffer low voltage at low RPMs. With a stock stator the lights may dim a little bit at idle, you might get 10V instead of 12V. With a high-output stator you're probably only producing about 4V at idle, the lights will be almost non-existent, and then brighten as you rev the engine.

If you're worried about power production at low RPMs, a high-output stator is NOT the answer, it will actually be worse.

Bio86 · « **Reply #20 on:** June 21, 2014, 04:35:32 PM »

Would the high output stator charge more at higher rpms though?

Jerry Hall · « **Reply #21 on:** June 21, 2014, 08:09:19 PM »

Quote from: Bio86;37237

Would the high output stator charge more at higher rpms though?

Yes...........and if the RPMs are high you probably do not need a fan because your speed will be high enough to push enough air through the radiator to keep the engine cool.

Like I have said before: if you are having heating problems due to low vehicle speeds you probably should be riding a four stroke and not a 250 R based bike.

aberegg05 · « **Reply #22 on:** June 21, 2014, 09:31:31 PM »

Quote from: Jerry Hall;37242

Yes...........and if the RPMs are high you probably do not need a fan because your speed will be high enough to push enough air through the radiator to keep the engine cool.

Like I have said before: if you are having heating problems due to low vehicle speeds you probably should be riding a four stroke and not a 250 R based bike.

Really??? I thought this was a trx250r forum. Ill never sell my R for a boring 4 poke. People don't realize the environment I ride in isn't the dunes I can't run 60mph the whole time and my stock rad isn't up to the task of cooling my 330 stroker. I was just trying to find a cheaper alternative to keep my engine cooler in the tight trails than buying a $500 radiator. Thanks matt

Jerry Hall · « **Reply #23 on:** June 21, 2014, 10:04:26 PM »

I am not sure spending $500.00 on a radiator will fix the problem if your speeds are real low for more than a few minutes at a time. Adding more capacity to the cooling system will help keep the temps lower if you are only spending a minute or so at crawling speeds and then be able to ride at higher speeds for a few minutes to cool everything down and get ready for the next low speed section.

We have added tanks into the cooling system that hold about a gallon of additional coolant to help bridge the time between slow and fast sections.

aberegg05 · « **Reply #24 on:** June 21, 2014, 10:33:59 PM »

I'm really leaning towards using a fan that runs off a battery. If I can find a setup that will last for about 10hrs or more then recharge, that would be perfect. The fan only needs to run periodically not constantly.

Jerry Hall · « **Reply #25 on:** June 22, 2014, 12:53:58 AM »

Quote from: aberegg05;37249

I'm really leaning towards using a fan that runs off a battery. If I can find a setup that will last for about 10hrs or more then recharge, that would be perfect. The fan only needs to run periodically not constantly.

It will take a battery much larger than what the 450s have to run a fan for very long without hurting the battery. Small deep cycle batteries will be expensive.

Cheap batteries like most jet skis and small street bikes have are around 20 amp-hours. The cost on these batteries are in the $40 to $100 range. These batteries are about 10 lbs and theoretically would run a 4 amp fan (about 50 watts) for 5 hours. In real life you would be lucky if it would run the fan for 2 hours and would probably be junk after running the battery down and recharging it 5 times or so.

Steele16 · « **Reply #26 on:** June 22, 2014, 10:12:53 AM »

Also interested in a fan. Afco radiator doesn't do the job. It's just not big enough. I've got a JRD that's about double the capacity that I'm going to try, then it's fan time!

DnB_Racing · « **Reply #27 on:** June 22, 2014, 10:34:03 AM »

Quote from: wilkin250r;37235

I'm thinking a 200W stator will actually be WORSE.

I could go on a whole long-winded post on how electricity is generated,

just for the record ..I've learned a lot from some of these "long-winded" posts...
I miss your full page reports on electrical issues, ALLWAYS learned something..

please don't be afraid to be long winded I know I read every word!!

Grande huevos · « **Reply #28 on:** June 23, 2014, 11:02:30 PM »

Quote from: Steele16;37266

Also interested in a fan. Afco radiator doesn't do the job. It's just not big enough. I've got a JRD that's about double the capacity that I'm going to try, then it's fan time!

Have you personally ran an Afco or just guessing??? I have never heard of a single person that has used one and didn't have significant gains! I couldn't ride my built 330 for more then 15-20 min out in the open without having to shut her down because I was hitting 200-210 and if I was in the woods the ride time was cut in half. It was very frustrating I took my front bumper off moved my shock ressies and so on. Finally I broke down and spent the $350 and have never had a single overheating issue since then. Now with the same motor it never gets above 175.

I don't know how the jrd compares to a Afco but afcos are at the higher end I the spectrum and If it doesn't fix your problem then I highly doubt a little fan will solve your issues! Maybe you have another issue going on somewhere? Possibly partily clogged water jacket or somthing?

Steele16 · « **Reply #29 on:** June 23, 2014, 11:10:44 PM »

I just took my afco off and sold it. It's tiny. I have a Pro Series double pass on my hybrid that is around double the capacity of the afco, and the JRD is about the same as the pro series. The afco works great I'm sure on small motors just not nearly enough for my setup/what I do with it.