Water temperature

[thagua]

Last weekend had a very interesting chat with a friend (mechanic) and speaking of my bike without cat he said that I would need to try reducing the temperature at which the fan starts (106°C) because without cat you don't need that extra heat in the exhaust and in this way you can run the engine slightly cooler (say 95°C?) ... anyone has experience on this subject?... how about replacing the the bulb?
Cheers,
Thagua

 

[KSH]

From my testing I have found that for better Mpg's the engine likes warmer water temps, but have seen no benefit of excessive high temps.

 

[fredz43]

That fan is only going to come on when you are sitting still for an extended time, isn't it? When you are moving, you get enough airflow that coolant temperature doesn't get high enough, so I don't see how lowering the setting for the fan to come on is going to make any difference in everyday riding.

 

[markjenn]

That fan is only going to come on when you are sitting still for an extended time, isn't it? When you are moving, you get enough airflow that coolant temperature doesn't get high enough, so I don't see how lowering the setting for the fan to come on is going to make any difference in everyday riding.

What he said.

Since the fan only comes on in limited-airflow situations, it is the coolant thermostat that controls everyday running temp. I doubt Yamaha optimized either the thermostat or fan temp for the cat and doubt either has much effect on cat temps which are set by exhaust gas temps, not the overall temp of the engine.

As to whether a change in either temp would have benefits or drawbacks, no idea, but I wouldn't see any reason to change it without a specific engine tuning goal.

No idea how you'd change either temp. You could rig an aux fan override switch so you can can turn it on manually; some have done this on other bikes prone to overheating to "get a jump" on the temp rise.

- Mark

 

[RIVA]

::015:: Looking for a solution to a non-existant problem ?. ::002::