I am mounting a evolution 45 in an aerotech mustang. I have several questions;
1. Anyone with performance figures for the BCM muffler (wrap around inverted pitts style ) on this engine?

2. Experience with the single bolt prop shaft vs the 6 bolt mounting system for the prop?

3. Is it worth upgrading to the new ignition system?

thanks Roy

I'm not familiar with the aerotech mustang so I cannot comment on that combination. However, there are 3 of us at my field running the Evolution 45GX with the BCM wrap around pitts. All 3 engines seem to produce similar numbers ... the only difference being the prop chosen for the flying styles and airframes. We did a tach comparison against a well tuned Brison 3.2 with both engines swinging an NX 23x8 wood. The Brison's numbers were 6800 and the Evolution was 6500. The Evolution only had 2 tanks thru it at 30:1 so I expect it to actually perform quite a bit better after breakin, 40:1 mix and carb tweaks.

I myself have about a gallon thru mine spinning a Biela 22x8 at about 6650 and pretty much tweaked on the needle settings. I was running an NX 22x8 wood and getting about 6750 rpm (I was surprised at the rpm difference between the NX and Biela).

The 45GX comes with the 6 hole hub but only 3 prop bolts as well as the nut with prop nut spacer. I do not run the prop nut or nut spacer and added flat washers and lock washers to the 3 prop bolts. The others run bolts and nut ... but I didn't want the added weight

I have not seen the new ignition and have only read what is available here on RCU. preivers is probably the best person to discuss the ignition options with pros and cons.

If you compare Brison 3.2 (52.5cc) with the 43cc (2.6) engine, that is a bit apples and pears, but it shows how strong the little one realy is.
Running less oil will not bring you one single rpm extra. Probably less.

When using the 3xM5 bolts only, check them before each flight for tightness. If you allow the bolts to take shear forces, you <will> loose the prop sooner or later. I would rather use the single M10x1+contra-nut only on wood propellers. For security, I add just two of the three M5 bolts, and torque them lightly.

Thankyou preivers and bonedaddy for your help. the information is very helpful. Roy

The new ignition comes in three flavours.
L=Light, suitable for 2S lipo, and reverse running cut-off (26cc 35cc)
S=Standard, 2S Lipo, different advance curves pipe/canister, reverse running and choke operation below 900 rpm (45M and 58cc), Output for LED panel as option
P=Pro, 3S lipo, different advance curves pipe/canister, reverse running and choke operation below 900 rpm. (58 prosport), Output for LED panel

The ignition change is mainly a change to a different supplier. Apart from the lipo battery, there is not much everyday advantage over the Vlach ignitions. These engines start so well, that the automatic choke is not needed. On Aspen (Alkylate petrol) fuel using the feature would flood the engine and thus prevent starting. The extra choke servo adds weight and wiring, which is a point to consider as well.
Reverse running only happens at very low rpm and light props, and is easily avoided.

Pe, My MVVS Prosport starts and runs backwards about every 15th start. I even raised the throttle setting to 4 clicks on the transmitter stick. (4 clicks of throttle forward will hover this plane) This is a fast enough idle in reverse that the plane backs up away from the starting pegs in the grass. I'd hate to raise the throttle setting any higher because of the unpredictable starts. What do you recommend?? Thanks.

running backward is cause by too little momentum to get the prop over top dead centre at idle. Momentum can be increased by higher rpm, or higher prop (flywheel) mass, or both. Wheel chocks come to my mind as an option.
It also may help to retard the ignition somewhat. If one of the ignition sensor screws is removed, the ignition can be adjusted quite substantially by rotating the sensor with the remaining screw as pivot point.
After starting, the ignition will fire at about top dead center, but will advance after a fixed number of revolutions. At the low idle we need to keep the plane from moving, the engine may then kick back and run backwards. I found the engine can run with retarded ignition quite well, and without noticeable power loss.

Just finished my yak with the Evo 45.Tried to start it at the field but gave up after an hour.The ignition light was flashing,there was gas in the carb but not a sign of ignition,I did have the help of someone who flies gas often.Any suggestions welcome.Joe

I think i know what the problem was. I was using a 5 cell pack so not enough voltage.

The ignition LED on the new ignition modules will flash indicating a low battery voltage. While the ignition is rated to run at 6.0 volts, the module will not allow the engine to start unless the battery voltage is at or above 6.5 volts. (Typical full charge on a 5 cell pack is 6.7 - 6.8 volts). The reliable, and lighter answer, is to use a 2S lipo pack.

Pete