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bob27s -> RE: Red vs Black muffler (10/27/2005 6:54:11 PM)
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Hi Jon,
Thanks for writing.....
Sorry for the confusion. I may have melted too much information together.
The SJ-60LX comes standard with the SS type muffler - red one, SS racing type, with the expanded volume center.
This is tuned for running best between 17,000 and 20,000 rpm. Works well with the 60LX, especially with the 10x6 and 10x7 props... and heavier full blade 9x9 and 9x10 props. The D1 8.8x9.25 is a good choice too. Most folks buying the engine were looking to turn heavier props. You want the engine to set 500-600 rpm down from peak for launch, no lower than 16,500 - preferably up over 17,000 rpm.
The black Q-500 muffler is shorter. That one is tuned for 18,500 to 22,000 rpm.
You can use the black muffler. The 60LX engine will love it. You just have to run the D1 pylon props, and make sure it turns no less than 19,500 at peak, and launches 500-600 rpm down - no less than 18,500. The 8.8x8.5 will get their easily. The 8.75x9W, 8.8x8.75 and 8.8x9 will too. Most likely will turn the 8.8x9.25 as well ( I have not tried it yet, but it should). Do not use any prop other than a good wood prop, or an APC Q-500 prop with the black muffler.
Since you have both mufflers - feel free to try both :) Let me know what your results are.
Bob
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