Engine Running Hot - Triumph Forum: Triumph Rat Motorcycle Forums
Tiger Workshop (archive) Shop Talk, Ideas, Hints, and Tips for smooth running for the 885 - 885i - 955i & 1050i Tigers (Threads in this sub-forum will be progressively moved to their relevant model sub-forum)

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post #1 of 9 (permalink) Old 07-04-2011, 04:49 PM Thread Starter
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Engine Running Hot

Hiya All,
Saw for the first time today while stopped at traffic lights my temp gauge read 7 bars, Its usually on 6 bars all the time,
London temp was around 26 degrees today but felt hotter,
I understand that these bikes are set to run hot as they run a lean fuel mixture which does not help with the cylinder temp,
Is there a way I can make my cooling fan trip in earlier than the factory setting of 102 degrees?
Thanks

Last edited by Spartan Andy; 07-05-2011 at 05:19 AM.
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post #2 of 9 (permalink) Old 07-12-2011, 02:25 AM
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TuneECU will allow you to change the temp at which the fan will cut in.

Google it, or search it on this forum. You'll need a cable, but the software is free, or for donation.

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post #3 of 9 (permalink) Old 07-12-2011, 03:31 AM
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While the fan temp can be adjusted using TuneECU, be aware that this will only affect the coolant temperature in the radiator. Overall, the coolant temperature is controlled by the bi-metal thermostat as in many modern engines.
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post #4 of 9 (permalink) Old 07-12-2011, 06:44 AM
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Deano I heard you say this a couple times now, and it made me wonder something... Since you've brought it up I have to ask. :-)

If the fan temp being lowered turns the fan on sooner, but the actual temp is not related to that, are you saying that lowering the fan temp will just make it stay on more often but have no effect on engine / coolant temperature?

If so, why bother?

Thanks,
Chris
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post #5 of 9 (permalink) Old 07-12-2011, 11:56 AM
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The coolant circulates to the engine from the radiator when the thermostat opens. I don't know the factory thermostat heat setting, but to get coolant circulating sooner, you would need a lower temp thermostat. That would allow coolant to circulate through the engine at a lower temperature. This may not lower you running temperature in very hot weather, however, if the cooling system is not capable of keeping the coolant temp at the thermostat temp.

As an example, I have a 180 degree F thermostat in one of my classic cars. Coolant/engine temp stays at 180 degrees when the weather temp is mild or winter. But here in Texas, we get many 100 degree plus days and the coolant/engine temp stays at over 200 degrees with the a/c on. My option is to get a bigger, aluminun radiator that has enough cooling capacity to keep the coolant temp at the thermostat temp.

Hope this helps explain.
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post #6 of 9 (permalink) Old 07-12-2011, 05:27 PM Thread Starter
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Hiya All, Bit lost in the translation,
Heres my basic logic to this,
If a thermostat opens below the temperature of the coolant fan cutting on temperature, Then am I right in saying that any setting above the thermostat opening temperature would work in keeping the engine temps lower,

Last edited by Spartan Andy; 07-12-2011 at 05:55 PM. Reason: www.youtube.com/watch?v=vksdBSVAM6g
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post #7 of 9 (permalink) Old 07-12-2011, 11:47 PM
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Hi Andy,

Yeah I think you got it. The zone is between the thermostat's temperature, which lets the coolant move through the block, and whatever the "max temp" is that you want to avoid -- that's the range that the cooling system (all of it including the fan but also the rad) does their thing. Setting the fan temp below the thermostat temp would be ineffectual since the collant is not entering the engine until the thermostat opens up.

That said, it seems like the thermostat will open much earlier than the fan would kick in, as it's purpose is to help the engine warm up, not to cool down. In other words it is at the "bottom end" of the temperature range of the motor. I would imagine the cooling fan would kick in at something like 75% of max -- or perhaps there's a rate-of-change function that turns it on if the temperature's rate of increase is too sharp (such as stopping at a light in very hot weather).

So there should be a far bit of play between the "thermostat open" temperature, and the "fan on" temperature, that one could adjust if they wanted to.

I hope the fan sensor is on the radiator side of the thermostat. lol.
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post #8 of 9 (permalink) Old 07-13-2011, 04:21 PM Thread Starter
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Horay, I have a better understand now and thanks to all, As I think were not having much of a summer here in the UK at the moment, 18degrees today, will leave the bike as standard, But it gives me time to find a good tune to download and buy the lead,
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post #9 of 9 (permalink) Old 07-13-2011, 05:34 PM
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It's a balmy 102 degrees F (38.88 C) here in north Texas at 4:00 PM. I haven't been doing any riding. It was 84 F this morning at 6:00am. Triple digits every day in the 7 day outlook. Think about those poor air cooled bikes down here. They seem to last a lot of miles but they must be cooking their internals in traffic.

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