Hi!
You don't have to set up a tuned pipe!!!!!
Most pipe systems are plug and play!
Like the JETT , Nelson or MVVS systems! On these systems there is nothing to adjust ! Just mount the pipe and go! What you have to adjust is the choice of prop size, fuel (nitro content) tank system and glow plug .
Here is what I recommend from 30 years of competing in pylon racing.

1.Get a 240cc (8oz) Tettra "Bubbleless tank"!

2. Second best: Get an ordinary R/C clunk tank( 240cc tank), preferably set up with two clunks (called Uni-flow set up) This system with two clunks gives more even fuel pressure delivery to the carb.

3. Mount the tank according to the tank mounting rule!

4. Use 5% nitro fuel!

5. Use a good plug like a Enya 3 or 4. or Nova Rossi 4or 5.

6. Use a good prop like a RAM , Graupner "Cam-prop" or APC! Please not MA or Kyosho!

DarZeelon

Thank you for that information. I think I did something similar when I initially set mine up. I did use the prop I intended to run, and not a smaller pitch one to simulate unloading however.

My initial setup was on a 10x6 APC prop and 10% Nitro. With a Mac's 1 piece muffler it was tached (max) at 13,400 RPM. That gave me a baseline of what I wanted to improve upon.

I set a goal to gain 1000 RPM and move up 1 pitch size to a 7. Now perhaps this seems fool-hearty, or conservative, but it was my goal.

Replacing the 10x6 with a 10x7 APC I installed a Mac's header, sleeve and pipe. It took 4 runs, measured by a tach to achieve the 14,500 RPM. After each run I removed .25" of header for a total of about 1". The final run resulted in a nice transition from idle to WOT.

Granted, the motor mav have more in it (RPM wise) but I figured a conservative tune was better then nothing. If you feel what I did may be part of the problem I am having (WOT misfire) let me know and Ill start from scratch.

Tommy D

Quote:

ORIGINAL: jaka

You don't have to set up a tuned pipe!!!!!
Most pipe systems are plug and play!

Like the JETT, Nelson or MVVS systems! On these systems there is nothing to adjust! Just mount the pipe and go! What you have to adjust is the choice of prop size, fuel (nitro content) tank system and glow plug.

Jan,


I beg to disagree with the maroon colored statement.

The examples that you gave; the JettStream, the UltraThrust (and to a lesser degree, the MVVS tuned mufflers), are hardly full-length tuned-pipes.
They are 'set and forget', but the first two are more limited in the range of props they can be used with.

Even a full-length pipe claimed to be pre-tuned, really isn't and it can be tweaked for length, if top performance is desired.