Nitroaddict
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I have titled this thread in order to come up on searches. Please do not post any unrelated comments here. Feel free however, to add any other important steps I may have left out:
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How To Break-In & Tune an Engine
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To start - make sure your needle settings are at factory break-in settings. Please refer to your specific manual for proper settings. As a starting point for those who have no manual, an general rule of thumb is:
Bottom End (Low End)- Flush with carb
High End (Top End)- 3 Turns out
Idle- Set the gap inside the carb at 0.7mm to 1.0mm
DO NOT OVERTIGHTEN NEEDLES, AS YOU WILL RIP THE O-RINGS!
Factory Settings are not the fix-all answer to engine tuning problems. These settings will likely set your engine rich, and may not work under the conditions you are in. There are many variables which we can not control. Variables include type and percentage of fuel, type of glow plug, length of fuel and pressure lines, ambient temperature, barometric pressure, humidity, and even your level of experience and knowledge level. .
Here are some tips to help tune your engine, read on even if you are an experienced racer.
1- The break in process is the most crucial time in the life of an engine. Take care not to over rev and over heat an engine during this time. Conversely, do not take too long to break in an engine, as running an engine too rich for too long can cause damage to the conrod. When breaking in an engine, you may need to leave the glow igniter attached to keep the engine running.
2- Always make adjustments after allowing the engine to warm up fully. I strongly suggest setting the optimum tune with 1/4 tank or less of fuel in the car. Most engines will run slightly rich with a full tank and slightly lean with a low tank.
3- Don't assume that a properly tuned engine on a street surface will run the same on a loose dirt surface. Keep an eye on changing conditions including weather, track conditions, tire size, etc.
4- The type of glow plug used has a huge effect on engine tune and performance. Sometimes changing the type of plug makes all the difference.
5- If you are unsure of the settings, it is safer to tune rich. It you are unsure of what you are doing, stop and seek help from someone with experience.
When Tuning an engine - Always Tune in the Following Order:
Tune one needle at a time. Never at the same time. Once the engine is properly tuned, it may run to fast at idle, due to the now leaner LSN. Adjust your ISS accordingly.
When tuning an engine, tune needles only 1/8th of a turn or less, and allow at least 60 seconds of running between adjustments.
When final tuning, or tuning for power, tune at increments of 1/16th or less.
====================================
Please add any relevant comments as you see fit. This is not a question/answer thread - do not post questions in this thread. Thank you.
Please feel free to print this out and use at your leisure
===========================================
How To Break-In & Tune an Engine
===========================================
To start - make sure your needle settings are at factory break-in settings. Please refer to your specific manual for proper settings. As a starting point for those who have no manual, an general rule of thumb is:
Bottom End (Low End)- Flush with carb
High End (Top End)- 3 Turns out
Idle- Set the gap inside the carb at 0.7mm to 1.0mm
DO NOT OVERTIGHTEN NEEDLES, AS YOU WILL RIP THE O-RINGS!
Factory Settings are not the fix-all answer to engine tuning problems. These settings will likely set your engine rich, and may not work under the conditions you are in. There are many variables which we can not control. Variables include type and percentage of fuel, type of glow plug, length of fuel and pressure lines, ambient temperature, barometric pressure, humidity, and even your level of experience and knowledge level. .
Here are some tips to help tune your engine, read on even if you are an experienced racer.
1- The break in process is the most crucial time in the life of an engine. Take care not to over rev and over heat an engine during this time. Conversely, do not take too long to break in an engine, as running an engine too rich for too long can cause damage to the conrod. When breaking in an engine, you may need to leave the glow igniter attached to keep the engine running.
2- Always make adjustments after allowing the engine to warm up fully. I strongly suggest setting the optimum tune with 1/4 tank or less of fuel in the car. Most engines will run slightly rich with a full tank and slightly lean with a low tank.
3- Don't assume that a properly tuned engine on a street surface will run the same on a loose dirt surface. Keep an eye on changing conditions including weather, track conditions, tire size, etc.
4- The type of glow plug used has a huge effect on engine tune and performance. Sometimes changing the type of plug makes all the difference.
5- If you are unsure of the settings, it is safer to tune rich. It you are unsure of what you are doing, stop and seek help from someone with experience.
When Tuning an engine - Always Tune in the Following Order:
- HSN - High speed needle
- LSN - Low speed needle
- ISS - Idle set screw
Tune one needle at a time. Never at the same time. Once the engine is properly tuned, it may run to fast at idle, due to the now leaner LSN. Adjust your ISS accordingly.
When tuning an engine, tune needles only 1/8th of a turn or less, and allow at least 60 seconds of running between adjustments.
When final tuning, or tuning for power, tune at increments of 1/16th or less.
====================================
Please add any relevant comments as you see fit. This is not a question/answer thread - do not post questions in this thread. Thank you.
Please feel free to print this out and use at your leisure
