You can easily avoid shutdowns or even seizures, if you learn to quickly recognize these few signals that will indicate if the carburetion too thin to avoid overheating the motor.
- A cold start the engine is fine, but goes out once it warms up.
- The motor is fine to a minimum and at half throttle, but is lacking or even turn off when we open the carburetor to maximum.
- your engine burn a regular candle, or the filament itself is distorted or too dark.
- The engine overheats even if you have already taken steps to eliminate any possible entry of air from the tank, the pipe or the mixture from the carburetor.
- The engine overheats and turns off even though there appears a good compression when tested in cold by turning the flywheel by hand.
- If we put a few drops of water (to avoid the spitting) head cooling immediately evaporate and disappear within 2 or 3 seconds.
- When the engine stops, you can not restart until it has completely cooled.
If you're experiencing any of these problems, it means adjusting your carburetor is too lean and you are putting at risk the engine.
remedies
- Begin to start with the carburetor adjusted according to the advice found in the instruction manual of the manufacturer (see also the post on the carburetor).
- Accingetevi a further and more refined setting only after 3 or 4 minutes of use, and when the engine reaches its operating temperature (about 90 ° -110 ° C). Do not do it before, you would have to review your carburetor when the engine has warmed up.
- When you set the needle up, do it with only small shifts (1 / 4 0 1 / 8 turn at a time), otherwise you will always have problems.
- If you think you've achieved a good adjustment, try to check the engine temperature with a thermometer. It is not necessary to reach a specific temperature, but it is imperative that does not exceed 130 ° C. If you do not have the sensor, have recourse to empiricism drop of water that we talked about earlier.
- If you notice, when you turn to most, the drop in engine blows or anticipates them, grease immediately carburetor!
- After eating at least one fuel tank, examined the filament of the candle if it is shiny or light gray, had made a good adjustment. If, by contrast, is dark gray or even distorted, then it means that the fuel mixture was too lean. Lubricated.
With regard to engine performance, if you increase the percentage of nitromethane, provided the other parameters: temperature, trim, spark plug, muffler, etc., the number of revolutions increases, approximately, by a percentage derived from the following mathematical relationship:
u = (N + 14) / 30
Where u is called the combustion factor and N is the percentage of nitromethane in the mixture. To in terms of power, it increases but not so conspicuous as the number of laps.
Note: The combustion factor u has been normalized to the percentage of 16% since, in most cases, the engines are tested on the test stand using mixtures with that amount of nitromethane. EXAMPLE
It has a mixture of 10% nitromethane. And it has an engine GX CR-12 G = No pull start that develops 22,500 rpm max, obtained at the test bench with a mixture of 16% nitromethane. Want to know how to get the maximum speed, provided all other parameters, if you use a 5% blend of nitromethane.
Knowing that N = 5, from (1) we have:
u = (N + 14) / 30 = (5 + 14) / 30 = 19/30 = .633.
Therefore, the maximum speed will be equal to: N = No
xu = 22,500 x 0.633 = 14,242.5 rpm.
- A cold start the engine is fine, but goes out once it warms up.
- The motor is fine to a minimum and at half throttle, but is lacking or even turn off when we open the carburetor to maximum.
- your engine burn a regular candle, or the filament itself is distorted or too dark.
- The engine overheats even if you have already taken steps to eliminate any possible entry of air from the tank, the pipe or the mixture from the carburetor.
- The engine overheats and turns off even though there appears a good compression when tested in cold by turning the flywheel by hand.
- If we put a few drops of water (to avoid the spitting) head cooling immediately evaporate and disappear within 2 or 3 seconds.
- When the engine stops, you can not restart until it has completely cooled.
If you're experiencing any of these problems, it means adjusting your carburetor is too lean and you are putting at risk the engine.
remedies
- Begin to start with the carburetor adjusted according to the advice found in the instruction manual of the manufacturer (see also the post on the carburetor).
- Accingetevi a further and more refined setting only after 3 or 4 minutes of use, and when the engine reaches its operating temperature (about 90 ° -110 ° C). Do not do it before, you would have to review your carburetor when the engine has warmed up.
- When you set the needle up, do it with only small shifts (1 / 4 0 1 / 8 turn at a time), otherwise you will always have problems.
- If you think you've achieved a good adjustment, try to check the engine temperature with a thermometer. It is not necessary to reach a specific temperature, but it is imperative that does not exceed 130 ° C. If you do not have the sensor, have recourse to empiricism drop of water that we talked about earlier.
- If you notice, when you turn to most, the drop in engine blows or anticipates them, grease immediately carburetor!
- After eating at least one fuel tank, examined the filament of the candle if it is shiny or light gray, had made a good adjustment. If, by contrast, is dark gray or even distorted, then it means that the fuel mixture was too lean. Lubricated.
With regard to engine performance, if you increase the percentage of nitromethane, provided the other parameters: temperature, trim, spark plug, muffler, etc., the number of revolutions increases, approximately, by a percentage derived from the following mathematical relationship:
u = (N + 14) / 30
Where u is called the combustion factor and N is the percentage of nitromethane in the mixture. To in terms of power, it increases but not so conspicuous as the number of laps.
Note: The combustion factor u has been normalized to the percentage of 16% since, in most cases, the engines are tested on the test stand using mixtures with that amount of nitromethane. EXAMPLE
It has a mixture of 10% nitromethane. And it has an engine GX CR-12 G = No pull start that develops 22,500 rpm max, obtained at the test bench with a mixture of 16% nitromethane. Want to know how to get the maximum speed, provided all other parameters, if you use a 5% blend of nitromethane.
Knowing that N = 5, from (1) we have:
u = (N + 14) / 30 = (5 + 14) / 30 = 19/30 = .633.
Therefore, the maximum speed will be equal to: N = No
xu = 22,500 x 0.633 = 14,242.5 rpm.
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