I would not say the MVVS is better than Saito 150 glow. With the Bisson Pitt, we can get 500RPM more than supplied muffler.
Here are a few tach reading I have found on internet with a bisson pitt muffler:
APC RPM
16x10 8500
16x8 8200
17x8 7900
17x8 7960
17x8 8210
18x10 8050
17x8 8500
MVVS1.6
Engine 932.7g 32.9oz
Ignition 107.73g 3.8oz
Bisson pitt muffler 153.08g 5.4oz
motor mount needed ? 7-10 oz
A glow engine has better weight/thrust or H.P ratio than gas under 40CC. If you want to fly 3D, go with the Saito (lighter). If you want to fly a lot, at low cost and pratice IMAC or pattern, gas is the way to go. Gas engine in a 120 plane can fly well if the weight 10-12lbs max and is always heavier than glow engine.
I am in the same boat, no place for tune pipe but i will try to save weight for the MVVS
The 3W24 is probably the most powerful in that class but there are not many info available on the tach reading: it likes to turn 18x18 8000RPM and 18x10 7500RPM and very expensive motor for that size.
But How many Scott towel do you use to clean your plane with a glow!
Scou.