Originally Posted by
aspeed
The black Master Airscrew if 10-6, it is the same as the prop in my tests, ya, the more the merrier. I would like to know just how much greater the Jett is as well as pretty much everything that size. Especially with no muffler, as the results vary so much. A Jett muffler can make any strong motor even stronger too. Using a pipe is so variable, that the results would not prove much, but a Jett pipe would be good. Wish I had one.
I have a .46 sized Jett muffler (tuned range 15,500-17,000) that I use on a few engines. Some engines get a greater benefit from using it than other engines do of course... They are much more versatile than full-wave pipes because they don't behave "peaky-like". One thing I did notice using a ST G51(Italy) - it ran better and faster on a 10x6 APC using a stock ST "Silent muffler" than it did using the Jettstream muffler. My TT Pro .46 gained about 1k rpm but the carb is a tad small to really open up. I think it peaked around 15,700 using the APC 10x6.
In this size class, I have the TT Pro .46, ST GS45 ABC (Italy), ST G51 (Italy), Fox .46 ABC, Fox .50, and Jett 56LX (Piped). The GS45 will probably run like a scalded cat on a Jett muffler or tuned pipe - it has a huge blowdown period. I haven't checked the port timing on it yet though. The Jett 56 probably won't run very well without a pipe on it due to its high pipe timing. If I get around to it, I'll round up some of these engines and run them. I rarely run my engines without a muffler so it'd be nice to see how well they run and what "real world" power they produce.