kvnnets
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Here's some info that I saw on the internet. Might be usefull to some.
Engine temperature is related to carburator setting, outside tempearture and coolinghead size and many more.
Our model car engines are designed to work in an outside temperatures of 22 degrees celsius.
The engine temperature itself should be in the range of 90-110 degrees celsius regardless the outside temperature.
100 degrees celsius we see as the optimum setting point.
To regulate the engine temperature we can go two ways.
1] adjusting the carburator settings.
2] changing the amount of cooling by changing the cooling head size.
Both are closely linked together but need different treatment!
All written below is just a general guide line to give you a rough indication what is needed to do.
Values may differ for your optimum situation.
Our ideal situation is this:
Let us say we have an outside temperature of 22 degrees celsius and a normal stock cooling head.
The engine runs fine by the current carburator setting at a temperature of 100 degrees celsius using 16% nitro and 10% oil.
Now the outside temp starts to rise to 32 degrees celsius.
Without changing the carburator setting the engine will become hotter let say 120 degrees celsius.
Now to lower the temperature you could richen up the carburator setting to drop the engine temperature under 110 degrees celsius.
If this is done normally the performance of the engine is reduced due to the richer carburator setting as it is not optimal anymore compared to the previous setting.
In this case putting a larger cooling head on the engine will allow you to keep the same standard carburator setting as on 22 degrees celsius outside temperature..
This way you have made sure the power is the same as with the 22 degrees outside temperature setting without sacrifycing engine life.
Now we go to an outisde temp of 12 degrees celsius.
Without changing the carburator setting the engine will become colder let say 80 degrees celsius.
To make the engine temperature higher you can lean the carburator setting to get the engine temperature above the 90 degrees celsius.
But leaning the carburator setting will also reduce the amount of lubrication as the oil is a fixed ratio to the fuel in our case 10%.
In this case putting a smaller cooling head on the engine will allow you to keep the same standard carburator setting as on 22 degrees celsius outside temperature.
This way you have made sure the power is the same as with 22 degrees outside temperature setting with enough lubrification.
The table below shows which way to go with the size of the cooling head compared to the outside temperature.
Outside Temperature - 12 degrees celsius - Small Cooling Head
Outside Temperature - 22 degrees celsius - Stock Cooling Head
Outside Temperature - 32 degrees celsius - Large Cooling Head
* So running your engine as cold as possible is not good always try to obtain the 100 degrees celsius point..
* Leaning carburator settings to compensate for lower outside temperatures is not good.
Try to change the size of the head together with a maximum carburator setting (inside 1/4 turns for round barrel carburators) to achieve the right engine temperature.
From www.twf8.ws
Engine temperature is related to carburator setting, outside tempearture and coolinghead size and many more.
Our model car engines are designed to work in an outside temperatures of 22 degrees celsius.
The engine temperature itself should be in the range of 90-110 degrees celsius regardless the outside temperature.
100 degrees celsius we see as the optimum setting point.
To regulate the engine temperature we can go two ways.
1] adjusting the carburator settings.
2] changing the amount of cooling by changing the cooling head size.
Both are closely linked together but need different treatment!
All written below is just a general guide line to give you a rough indication what is needed to do.
Values may differ for your optimum situation.
Our ideal situation is this:
Let us say we have an outside temperature of 22 degrees celsius and a normal stock cooling head.
The engine runs fine by the current carburator setting at a temperature of 100 degrees celsius using 16% nitro and 10% oil.
Now the outside temp starts to rise to 32 degrees celsius.
Without changing the carburator setting the engine will become hotter let say 120 degrees celsius.
Now to lower the temperature you could richen up the carburator setting to drop the engine temperature under 110 degrees celsius.
If this is done normally the performance of the engine is reduced due to the richer carburator setting as it is not optimal anymore compared to the previous setting.
In this case putting a larger cooling head on the engine will allow you to keep the same standard carburator setting as on 22 degrees celsius outside temperature..
This way you have made sure the power is the same as with the 22 degrees outside temperature setting without sacrifycing engine life.
Now we go to an outisde temp of 12 degrees celsius.
Without changing the carburator setting the engine will become colder let say 80 degrees celsius.
To make the engine temperature higher you can lean the carburator setting to get the engine temperature above the 90 degrees celsius.
But leaning the carburator setting will also reduce the amount of lubrication as the oil is a fixed ratio to the fuel in our case 10%.
In this case putting a smaller cooling head on the engine will allow you to keep the same standard carburator setting as on 22 degrees celsius outside temperature.
This way you have made sure the power is the same as with 22 degrees outside temperature setting with enough lubrification.
The table below shows which way to go with the size of the cooling head compared to the outside temperature.
Outside Temperature - 12 degrees celsius - Small Cooling Head
Outside Temperature - 22 degrees celsius - Stock Cooling Head
Outside Temperature - 32 degrees celsius - Large Cooling Head
* So running your engine as cold as possible is not good always try to obtain the 100 degrees celsius point..
* Leaning carburator settings to compensate for lower outside temperatures is not good.
Try to change the size of the head together with a maximum carburator setting (inside 1/4 turns for round barrel carburators) to achieve the right engine temperature.
From www.twf8.ws
