aircooled engines in hot weather?

[sidewinder]

All this hot weather at the moment i became a bit concerned about the divvy getting a bit to hot in slow moving traffic.It has never bothered me before but now its the hottest ive ridden in will the bike be ok probably a dull question but i dont really want to damage the bike and cant afford another one

[SQL]

Is the engine in air?

therefore it will say cool enough unless you are redlining it standing still

[sidewinder]

[Frost]

It may seem hotter to you going from an air temperature of 18C to 28C but the bike won't give a shit any more than it going from 8 to 18. People use air cooled bikes in far hotter countries than this will ever be.
The main danger in overheating a water cooled bike is over pressurising the coolant, so an air cooled bike will have a bigger operating window.

[janner_10]

This weather is nothing to the tolerances the bike was designed to withstand.

Cant be said when in leathers stuck in traffic though - I actually resorted to the car this week - its just too hot!!
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Yamaha FZS600 (Now gone to heaven) > CBR600F4i (SOLD) > '99 YZF-R1

[sidewinder]

Cheers guys you have set my mind at ease

[Andy_Pagin]

In the extremely unlikely event that the bike overheated the mixture would just become massively over lean and you'd lose all power, It's unmistakable, you'd just need to stop and let it cool down for a while. My old V8 converted Landrover used to do this occasionally before I fitted an oil cooler.
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They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

[stonesie]

[Sako]

Agree

Can't live without aircon

[Andy_Pagin]

I can bake bread in my Landrover atm.
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

[yen_powell]

[windows95]

If this can handle the extreme stress it must be under in the very warm climate/country it appears to be in (Africa?) Then I think we can rest assured our A/C's will be fine.

https://photos.imageevent.com/motorbiker/newspics3/Animal-on-motorcycle-20.jpg

Seriously though I often wonder about my Kymco Pulsar which is A/C. I've been riding it this week and to be honest if anything I would say the engine prefers getting abit hotter than it usually is... seems to go better in this weather.

Either that or its on it's way out...
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Current Bikes: Kymco Pulsar 125 2011 & Honda CB125TDC Super Dream 1982
Past Bikes: Typhoon 125, AP50, BWS 50, CBR125, Kymco ZX 50, Gilera Runner 125, 180 & 172, Honda XLR 125, KMX 125 x2, Piaggio NRG x3, x2 110 Pit Bikes, Pug Trekker 50, Honda Sky, Speedfight 50 & 100cc, SR50 x2, Suzuki Love, Chinese Fym 125 (yuk), Honda Varadero XL125-V1, Honda Vision 50 & 70cc, Honda X8R-S, Symjet 50, Suzuki Zillion &... Yamaha TDR 125.

[Derivative]

While you're right in saying the air will cool your engine less effectively at higher temperatures, the differential isn't changing enough for it to be significant.

A 100C engine with 15C air passing it: 85 degree temperature differential.
A 100C engine with 25C air passing it: 75 degree temperature differential.

Just over 10% difference.

Contrast that with a 37C human.
15C air has a difference of 22C.
25C air, a difference of 12C.

Almost half.

Back of the envelope and ridiculously simplified, but hopefully it gets the point across.

[windows95]

Out of complete curiosity...

How hot in degree's celsius does say, a Honda CG125 engine for example get when running typically? Must be pretty damn high?
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Current Bikes: Kymco Pulsar 125 2011 & Honda CB125TDC Super Dream 1982
Past Bikes: Typhoon 125, AP50, BWS 50, CBR125, Kymco ZX 50, Gilera Runner 125, 180 & 172, Honda XLR 125, KMX 125 x2, Piaggio NRG x3, x2 110 Pit Bikes, Pug Trekker 50, Honda Sky, Speedfight 50 & 100cc, SR50 x2, Suzuki Love, Chinese Fym 125 (yuk), Honda Varadero XL125-V1, Honda Vision 50 & 70cc, Honda X8R-S, Symjet 50, Suzuki Zillion &... Yamaha TDR 125.

[Derivative]

[windows95]

[sidewinder]

Cheers again all might get a thermaster on the bike tomorrow and measure the actual temps it get to.just out of curiosity

[Acemastr]

That's true, we never see the engine temp, just the coolant temp, which technically isn't particularly helpful.

Why do we not get oil temp gauges anymore? much better information
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2017 KTM 350 XC-F - 2014 Yamaha R6 - 2005 Yamaha YZ125
2016 Toyota Tacoma Limited

[MattJ]

[Acemastr]

[windows95]

[Derivative]

[jjdugen]

One of my 'ghetto' tests for a balanced carb setup is to run the engine hot, turn out the garage lights and see how red the exhausts are glowing. They glow a very pretty red. That is F-ing hot. Never seen the cylinders or heads glowing, and that is in still air.
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The CBR900RR has been sold. Aprilia Falco worms its way into my heart.
Try Soi 23 on Amazon for a good read.... Self promotion? Moi?

[windows95]

Just like this then?

https://img175.imageshack.us/img175/7369/sxnanggwpf9.jpg

That is scary hot! The most i've ever managed was my old Piaggio NRG's standard pipe the tip at the end used to glow red and it used to spit flames alot...
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Current Bikes: Kymco Pulsar 125 2011 & Honda CB125TDC Super Dream 1982
Past Bikes: Typhoon 125, AP50, BWS 50, CBR125, Kymco ZX 50, Gilera Runner 125, 180 & 172, Honda XLR 125, KMX 125 x2, Piaggio NRG x3, x2 110 Pit Bikes, Pug Trekker 50, Honda Sky, Speedfight 50 & 100cc, SR50 x2, Suzuki Love, Chinese Fym 125 (yuk), Honda Varadero XL125-V1, Honda Vision 50 & 70cc, Honda X8R-S, Symjet 50, Suzuki Zillion &... Yamaha TDR 125.

[MattJ]