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 Temperature That WR250R Fan Comes On and Goes Off.

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DSO




PostSubject: Temperature That WR250R Fan Comes On and Goes Off.   Thu Mar 16, 2017 8:19 pm

At what water temperature does the WRR radiator cooling fan come on? At what temp does it go off?


Thanks...Phil
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66T

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PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Mar 16, 2017 11:54 pm

I've searched my workshop manual for this, because I needed to find the info when I was having cooling difficulties during sustained low-speed/idle conditions in hot weather using a std-bore aftermarket cylinder/piston assembly. Couldn't find it anywhere, but I'd like to know.

Having said that, I think I read it somewhere, but buggered if I can remember where. Sigh. Another geriatric moment. Sorry.

But I'll keep looking.
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DSO




PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Fri Mar 17, 2017 12:08 am

I understand 'senior moments'...I have emailed and posted many sources and nobody has given me the temps...voltage/amp check on fan jumps at 176 degrees [F]...so I am guessing the fan probably starts just above this but I would like to really know and not just guess!

Phil
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66T

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PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Fri Mar 17, 2017 12:50 am

OK. The nearest I can find is information from an owner with a Thermometer built into his radiator cap.

He says: Fan on at 220 deg F (104 deg C)
            Fan off at 200 degF (93 Deg C)

These temps seem a few degrees too cool to me, because our stock 1.1 bar (about 15 psi, I think) radiator cap increases the coolant boiling point to around 260deg F (around 126 deg C). It does, however, cover the fact that even with the red coolant overtemp warning light on for up to half an hour at a time (this is a work bike. I couldn't just leave what I was supposed to be doing and race around cooling off the engine ad infinitum), the Yamaha coolant did not boil at any point. Thus I'm absolutely satisfied that stock coolant is more than adequate. If my engine boils using this stuff, there's something badly wrong.
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66T

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PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Fri Mar 17, 2017 1:10 am

More info. I also own a 2010 XT660Z Tenere. I have found definitive figures of: On at 102 deg C, Off at 95 deg C: for its cooling fan.

So it seems I was wrong, and the radiator cap thermometer is pretty much accurate. Maybe even a couple of degrees hot. I think the Yamaha would have a fairly standard engine temperature range for its products, which still allows for a decent safety margin when using its coolant. Though that's obviously just my opinion, and might be total bs.
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DSO




PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Fri Mar 17, 2017 1:04 pm

Hey...that all makes sense....I am flushing system and filling with Engine Ice coolant...then when, if!, it warms up here I will run it and check with an IR Gun to establish the temps for fan operation...truly academic about temps, but this is a 'new to me' '08 and I want to confirm the fan is functioning and functioning correctly....

Thanks for your input.

Phil
NE Oregon
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asphaltaddict33




PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Aug 24, 2017 12:30 pm

DSO wrote:
...I am flushing system and filling with Engine Ice coolant...

Are you still running Engine Ice? Any opinions on if it is snake oil or effective product?
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DSO




PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Aug 24, 2017 12:52 pm

asphaltaddict33 wrote:
DSO wrote:
...I am flushing system and filling with Engine Ice coolant...

Are you still running Engine Ice? Any opinions on if it is snake oil or effective product?

No real way to assess the engine temp changes with Engine Ice...subjective only...completed 2,493 miles on BOM'17...off road Idaho, Montana and Wyoming...temps often in mid to high 90's..lots of slow speed 1-3 gear...and never had a 'boil over' or loss of any coolant that I can see from level in overflow tank...so, I am happy! Might mention this with FMF Q4 and FMF controller ...probably running a little rich [again who can tell] and still 65 mpg...oh, 10-40w Redline and oiled UNI filter from Oz...

Phil
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dicklane625

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PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Aug 24, 2017 4:19 pm

Those temp sounds hot to me... I guess I'm comparing them to the opening point of a cars thermostat which is normally way before the fan kicks on, so I guess they sound right.

I read engine ice is designed more to meet some track regulations on coolant. So if something happens and it leaks on the track the spill doesn't get as slippery. I have used it before, it didn't freeze or hurt the bike. I didn't run it for that long though, sold the machine I filled up with it. Have you ever compared corrosion in the cooling channels and rad after engine ice to other antifreeze? That would be my reason for running a premium coolant. The temp around here at the hottest barley touches 100f...
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DSO




PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Aug 24, 2017 5:39 pm

dicklane625 wrote:
Those temp sounds hot to me... I guess I'm comparing them to the opening point of a cars thermostat which is normally way before the fan kicks on, so I guess they sound right.

I read engine ice is designed more to meet some track regulations on coolant. So if something happens and it leaks on the track the spill doesn't get as slippery. I have used it before, it didn't freeze or hurt the bike. I didn't run it for that long though, sold the machine I filled up with it. Have you ever compared corrosion in the cooling channels and rad after engine ice to other antifreeze? That would be my reason for running a premium coolant. The temp around here at the hottest barley touches 100f...

Well...I am unclear what your points are...care to elaborate? Engine Ice is sold for off road motorcycle riding specifically; not just for racing.

Is it a superior product to "premium antifreeze"...no idea but reviewing the comments of those using this product off road it seems to lower max temps and does inhibit corrosion..have I compared the internal channels in the radiator before and after using Engine Ice..no.

But hey, I could be wrong! Very happy
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dicklane625

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PostSubject: Re: Temperature That WR250R Fan Comes On and Goes Off.   Thu Aug 24, 2017 6:41 pm

At first the temps sounded hot for the fan turning on and off, this has nada to do with coolant. I'll admit it was kinda pointless to say.

As for the engine ice, I don't remember all that well what they said. I remember that it was something about the chemical structure. It might have been for some dirt too. I could see some places and events having restrictions on what could get spilled, or the clean up process. But there were several people that weren't on the engine ice train.

I've taken apart water cooled single cylinder engines and found some nasty stuff in the cooling channels. They weren't that old, but I wasn't the only owner, so who knows if it was ever flushed. I don't know what that gunk was made of. I could see it making a difference in the temps by slowing circulation and/or by insulating the whole heat exchanging process. So I want to know if anyone has bought a motor new and ran it with a certain coolant for most of its life. At some point opened up that engine and not found any crap in the cooling channels. I realize a big part of this is probably routine maintenance. Does the coolant itself make a difference?
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