<span style="font-size: small; "><span style="font-family: Arial; ">I have a seagull models edge 540 equipped with an Evolution .46NT engine(which i have never had a problem with) and it is not quite strong enough. Is there any way to increase RPM's and the engines horse power at all? And if a new muffler would help, would the Bisson Pitts muffler do the trick? If not, what could I do?</span></span>

Use a APC 12.25 X 3.75 prop

Change the muffler to a Tower Hobbies 46 muffler. The Pitts muffler will not help and may hurt.
The easiest fix is to experiment with props and increase the nitro in your fuel.

More than 15%? thats what i use.

The Tower muffler is out of stock for a undetermined time

What about the APC 12x4 prop?

what do u need to achieve:

more power for 3d, more power for sprot flying?

What about the APC 12x4 prop? Try it and see.

Yes(both)... Couldn't have said it better myself.
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More than 15%? thats what i use. Run 20-20 or 30 heli

You can use a Jetstream muffler http://www.jettengineering.com/accy/jettstream.html

The A3 plug and Tower's muffler turns the .46NT into a strong engine. It has noticeably more power than a .46FX.

The model I inherited from a friend went from barely hovering with his .46FX to hovering with spare power to pull out with the Evolution.

W8YE is right about the APC 12.25x3.75 prop. It is a stump puller for the Evo.

You are going to get big rpm bumps with those two items. Your model is a bit heavy though for hover power with a .46 engine.

Try the APC 11.5x4. It is a great compromise between sport and 3D. I found that the 12.25x3.75 was very heavy and took a long time to spin up.

It sounds like all you need is some test and tune using different prop glow plug and fuel combos.

How is the power of the Evolution .46NT (tuned as the strong engine mentioned above) when compared to an OS .46AX? I have heard that the latter are a bit stronger than the FX, but it is only heresay. By the time I got around to buying OS engines in that size range, I jumped to the .55AX, so I haven't experienced the .46AX, but I hear good things about them.

Barry, what is it about the Evolution engines (glow) that you seem to like so much? This is a serious question, but any kind of answer you give will be appreciated, even something as simple as, "I just like the way that it looks". I'm not going to argue with you one bit. I like Sanye made engines.


Ed Cregger

different mufflers dont add power to an engine but give back power that is already there. the tower muffler is better than most stock mufflers, the jett muffler give back almost of the engines power back. the way we test engines is to run them in open exhaust once broken in then put muffler on and see how much you lost. open exhaust you will have to open the needle up alot so do that before runnning.

the Tower muffler only cost ya about 500 or so rpm on most engines, the jett only around 100 rpm or less. the jett in cowl mufflers only about a 200-300 loss which is very good for thier size. A properly set tuned pipe is the only exhaust system to give a gain.

Putting a tower muffler on a evo 46 and say it has more power than a OS46 isnt a good comparison. put the tower muffler on the OS and then could measure but still not good since the engines have different timing and carb sizes. We have done alot of engines and almost all engines with mods turn the same rpm of the same size.

Try the props suggested here but i would look at going to a larger engine like the magnum 52 or the 55AX for about an 1000 rpm increase over your engine. the next best would be a 4 stroke but then the weight will be different.

Also guys looking for strong stock engines try to find one that has the same stroke and bore size or close as you can as these engines provide the most power overall.

we have gotten the GP42 to turn same rpm as the other 45-46's out there but at a much lighter weight, lol we just dont know how long it will last 10x6 at 15,800 on Jett muffler

could always go to a tuned pipe. Might get you the power you want. But I would use a magnum 52 instead. then get a Rossi mini pipe. Then you have a powerhouse in a compact unit.

You have a good point. However, the stock .46NT had enough of an increase in power over the .46FX to make mention of it. This was done on the another model and the comparison was easy to see. The only thing done was pull out the FX and put in the new Evo. Same prop and same fuel was used. Yes, carb and timing varies but that still leaves you with the power available for comparing. The FX and NT swaps were done on two models.

Ed, the things that I like about the Evolutions are quality build, good price, and great performance. Good chrome in the liner. Good prices on repair parts. An Evolution crankcase and crankshaft is about 40% the cost of comparable OS parts. Pistons and liners are priced where you can afford to work on and repair the engines instead of tossing them away.

Chris- the 12.25x3.75 is heavy. I never really noticed spin up lag. I did notice it when I switched back to an APC 11x7. There is a huge gap with those two props imo.

Has anybody had experience with mousse can pipes? if so, do they increase performance of the engine?

Mousse cans do work; its like a homemade Tower muffler. I think the big question is how much more power do you need? You are not going to turn the engine into a .60 if that is what your after. If you spend too much trying to make it better, you could have spent it on a bigger engine. I spent $50-70 on trying to prop a SuperTiger .90 with the best prop when I needed a different engine and could have put the money to better use buying it.