Header / Pipe Stinger Length
03-04-2003 | 01:51 AM
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From: Orlando, FL,
Header / Pipe Stinger Length
What do the laws of RC say about Modifying header length and stinger length. What are the effects of making them shorter or longer?
03-04-2003 | 02:07 PM
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From: Orlando, FL,
Header / Pipe Stinger Length
I'll answer my own post...
But if anyone has any more exact info, please follow up..
http://www.rcnitro.com/rn/articles/10_lobudget2.asp
When you change the exhaust header's length, you alter the dynamics of the pulses from the exhaust throughout the pipe and header. If you have a long header, the pulses will be slower and will give the engine more bottom-end power. A short header will speed the pulses' flow, and your engine will have better top-end power. To maximize power, adjust the header's length until the pipe and engine are in sync.
You can alter the length of your header simply by adjusting the gap between it and the pipe. If you need to make it any longer than the coupler permits, buy a longer coupler. If you have moved the pipe back so far that it is about to touch the header and you still need to mover it farther back, cut the header. Cut off only about 1/8 inch at a time, and run the engine after making every cut. Shorten the header until you are happy with the amount of power your engine produces.
But if anyone has any more exact info, please follow up..
http://www.rcnitro.com/rn/articles/10_lobudget2.asp
When you change the exhaust header's length, you alter the dynamics of the pulses from the exhaust throughout the pipe and header. If you have a long header, the pulses will be slower and will give the engine more bottom-end power. A short header will speed the pulses' flow, and your engine will have better top-end power. To maximize power, adjust the header's length until the pipe and engine are in sync.
You can alter the length of your header simply by adjusting the gap between it and the pipe. If you need to make it any longer than the coupler permits, buy a longer coupler. If you have moved the pipe back so far that it is about to touch the header and you still need to mover it farther back, cut the header. Cut off only about 1/8 inch at a time, and run the engine after making every cut. Shorten the header until you are happy with the amount of power your engine produces.
03-04-2003 | 05:33 PM
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From: Lakewood, CA,
Header / Pipe Stinger Length
from rcnitro.com:
The construction of the tuned pipe works with the pressure pulses coming out of the exhaust port. The pulses resonate inside of the pipe and travel back into the manifold. The pressure pulse actually pushes the air/fuel mixture that escaped out the manifold back into the combustion chamber. This super-charges the combustion chamber and gives the 2-stroke engine its characteristic peak HP. This is the point in which the engine turns ON. You will know that you hit this point because the car will accelerate rapidly when the engine gets on the pipe. You can actually fine-tune when the engine will have this extra burst of power. The speed at which the pressure waves from the pipe synchronizes with the piston, is a function of the length from the belly of the tuned pipe (widest part) to the center of the glow plug. The longer the distance, the faster the engine will come on the pipe. If you want to delay the time when the engine hits the supercharge, then shorten the header and/or pipe. When you replace the stock header/manifold, keep in mind that there is a reason for a pipe's size and geometry. You can use this information to your advantage to strengthen your engine's power band. A bad decision in the exhaust department can actually lower engine performance.
The construction of the tuned pipe works with the pressure pulses coming out of the exhaust port. The pulses resonate inside of the pipe and travel back into the manifold. The pressure pulse actually pushes the air/fuel mixture that escaped out the manifold back into the combustion chamber. This super-charges the combustion chamber and gives the 2-stroke engine its characteristic peak HP. This is the point in which the engine turns ON. You will know that you hit this point because the car will accelerate rapidly when the engine gets on the pipe. You can actually fine-tune when the engine will have this extra burst of power. The speed at which the pressure waves from the pipe synchronizes with the piston, is a function of the length from the belly of the tuned pipe (widest part) to the center of the glow plug. The longer the distance, the faster the engine will come on the pipe. If you want to delay the time when the engine hits the supercharge, then shorten the header and/or pipe. When you replace the stock header/manifold, keep in mind that there is a reason for a pipe's size and geometry. You can use this information to your advantage to strengthen your engine's power band. A bad decision in the exhaust department can actually lower engine performance.
