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Offline Milwakie

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Temperatura de motor
« on: October 07, 2018, 06:11:48 PM »
Hello, I would like to comment on the operating temperature of the engine in summer, with ambient temperature between 25-35 degrees the engine works between 80y102 but in winter with cold 1-10 degrees the engine runs on the road without going over 60 degrees, it has always been like that since new, how do your engines work?
thanks and best regards

Offline Crosshairs

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Re: Temperatura de motor
« Reply #1 on: October 07, 2018, 08:21:46 PM »
*Originally Posted by Milwakie [+]
Hello, I would like to comment on the operating temperature of the engine in summer, with ambient temperature between 25-35 degrees the engine works between 80y102 but in winter with cold 1-10 degrees the engine runs on the road without going over 60 degrees, it has always been like that since new, how do your engines work?
thanks and best regards

That sounds perfectly normal...The thermostats are not very precise on these bikes and will allow the coolant temperature to fluctuate through quite a wide range.

There are remedies, but its not something that you need to worry about.

Offline Floydsz1

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Re: Temperatura de motor
« Reply #2 on: October 07, 2018, 08:38:04 PM »
Sounds just like mine, no problems at all.

Offline Milwakie

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Re: Temperatura de motor
« Reply #3 on: October 07, 2018, 08:48:33 PM »
 :028:
Gracias

Offline dizzy

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Re: Temperatura de motor
« Reply #4 on: October 07, 2018, 09:35:32 PM »
Sounds like mine too.

It is the water temp not engine temp. FJRs I ride operate across a similar range. Depends on level of congestion too.

Offline Crosshairs

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Re: Temperatura de motor
« Reply #5 on: October 07, 2018, 10:42:52 PM »
*Originally Posted by dizzy [+]
Sounds like mine too.

It is the water temp not engine temp. FJRs I ride operate across a similar range. Depends on level of congestion too.

Huh?    Engine temp is water temp.....they are directly related...cold coolant means a cold engine and vice versa... sure, the cylinder head will be a bit hotter, but if your coolant is not up to temp, neither is the engine.

Offline dizzy

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Re: Temperatura de motor
« Reply #6 on: October 08, 2018, 08:30:55 AM »
AIUI engine temperature will be running consistently hot once warmed up. The thermostat will open and close to maintain that. The thermostat will initially remain closed to facilitate a quick warm up of engine itself.The water is a control mechanism. If the water is being cooled from air flow it will remain cooler than the engine. As the airflow slows the water won't be cooled as much and won't be able to release the heat is absorbing and water temperature will go up. At 100c the fan kicks in to add extra wind flow bringing the temperature down. The system is under pressure so boiling point is higher.

If the outside ambient temperature is higher it will cool less and open running water temperature will increase but low speed/stationary will still be held to maximum as fan kicks in. There is no doubt some point when the action of the fan would be insufficient outside normal design parameters.

Primary coolant will be the oil flow. The temperature at cylinder/head will higher.

An engine running at 5K on open road will be generating more heat than one ticking over at 1K but the water temperatures may be significantly higher in the latter as there is no air flow to cool.

« Last Edit: October 08, 2018, 09:12:19 AM by dizzy »

Offline Crosshairs

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Re: Temperatura de motor
« Reply #7 on: October 08, 2018, 12:13:15 PM »
*Originally Posted by dizzy [+]
AIUI engine temperature will be running consistently hot once warmed up. The thermostat will open and close to maintain that. The thermostat will initially remain closed to facilitate a quick warm up of engine itself.The water is a control mechanism. If the water is being cooled from air flow it will remain cooler than the engine. As the airflow slows the water won't be cooled as much and won't be able to release the heat is absorbing and water temperature will go up. At 100c the fan kicks in to add extra wind flow bringing the temperature down. The system is under pressure so boiling point is higher.

If the outside ambient temperature is higher it will cool less and open running water temperature will increase but low speed/stationary will still be held to maximum as fan kicks in. There is no doubt some point when the action of the fan would be insufficient outside normal design parameters.

You understand correctly. however the OP is referring to the fact that the engine temp does not stay steady, and that is due to the poor control of flow of the thermostat in this bike



*Originally Posted by dizzy [+]

Primary coolant will be the oil flow. The temperature at cylinder/head will higher.

primary coolant in a water cooled engine is always the coolant. the oil is secondary ..and yes the cylinder heads will be hotter as thats where the heat is concentrated


 
*Originally Posted by dizzy [+]
An engine running at 5K on open road will be generating more heat than one ticking over at 1K but the water temperatures may be significantly higher in the latter as there is no air flow to cool.


in a properly sized and functioning cooling system, the temperature should be the same...yes a gasoline  engine will generate more heat at 5k but that heat should easily be dissipated by the cooling system and engine temperature should remain relatively stable, moving or not. 
« Last Edit: October 08, 2018, 12:15:15 PM by Crosshairs »

Offline dizzy

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Re: Temperatura de motor
« Reply #8 on: October 08, 2018, 12:39:51 PM »
The oil is in direct contact with the heated surfaces so will be undertaking heat transfer inside the engine. The water is in a jacket outside it.

The coolant temperature is simply that of the coolant not the engine. If the engine is working at optimum temperature the coolant temperature doesn't really matter as long as it doesn't vaporise (or freeze).

Engine temperature is different to coolant temperature. Where the sensor, thermometer is located will also affect readings.

Having a system where the cooling fan was continually cycling to maintain a narrow temperature band may not be the most efficient if the engine operates fine without it.
« Last Edit: October 08, 2018, 01:16:56 PM by dizzy »

Offline Crosshairs

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Re: Temperatura de motor
« Reply #9 on: October 08, 2018, 01:11:49 PM »
*Originally Posted by dizzy [+]
The oil is in direct contact with the heated surfaces so will be undertaking heat transfer inside the engine. The water is in a jacket outside it.


The main contributor of heat is the  combustion chamber, the oil is not in contact with anything in there. some engines will have piston coolers that direct a spray of oil at the underside of the piston, this is not one of those engines the oil is in no more direct contact with heated surfaces than the coolant is.Its a water cooled engine, not an oil cooled engine. Yes, the oil does supply some cooling, but thats not its main purpose...


*Originally Posted by dizzy [+]
The coolant temperature is simply that of the coolant not the engine. If the engine is working at optimum temperature the coolant temperature doesn't really matter as long as it doesn't vaporise.

Engine temperature is different to coolant temperature. Where the sensor, thermometer is located will also affect readings.

Having a system where the cooling fan was continually cycling to maintain a narrow temperature band may not be the most efficient if the engine operates fine without it.


The coolant temperature is the engine temperature. its what is used to  controls engine temperature,  thats what is measured and thats what is controlled. there are no other sensors that monitor engine temperature..its the coolant sensor that controls  engine management . coolant temperature is whats used to determine when and for how long the fan runs. yes there will be spots on the engine that are hotter or colder than the coolant, but coolant temperature is whats used by the ECM to calculate fuel and timing.

Gasoline engines run efficiently in a very narrow temperature range and its the coolants job to keep the temperature in that range.

 



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