Pete S-RCU

If you convert a g62 to electronic ignition, you remove the flywheel.
Isn't the flywheel part of the balancing of the engine?
Then how can it in balance without the flywheel?

Seems like it would have vibration issues.

w8ye

My Feedback: (16)

The G62 is internally balanced. The flywheel only balances itself.

soarrich

My Feedback: (98)

FWIW I've run lots of MT62s, which are clones of the G-62, they have Electronic ignitions and have no issue with excessive vibrations.

BadAzzMaxx

They will actually idle smoother because the electronic retards the timing at idle.

milton

pe reivers

We recently converted a G62. Idle went down to 1100 rpm. The engine runs smooth as silk.

w8ye

My Feedback: (16)

The front and rear parts of your crankshaft have probably moved out of phase? You will need to get the crank straightened by Antique?

STUKA BARRY

All single cylinder engines are going to vibrate, especially the G-62, it hammers the crap out of an airframe, my warbirds prove that. The key is a properly balanced propeller. Remember, all Zenoahs are industrial engines meant to be run in weedeaters and chainsaws.

pe reivers

Which means that the engine must vibrate as little as possible in order to allow the operator to work with the engine all day, day in and day out.

tkg

My Feedback: (1)

All singles vibrate its the law. An engine designer can chose where the engine vibrates. The G-62 has 2 nodes one about 18-1900 rpm and a smaller one around 33-3600 rpm.
Smooth at higher settings

pe reivers

Thanks Terry. Good to know. 3500 is not a normal operating rpm. Neither is 1850

Antique

My Feedback: (4)

7 to 9000

SitNFly

My Feedback: (54)

Good info. So Pe's 1100 RPM idle must be pretty smooth?

MetallicaJunkie

what do you mean by nodes? rpm bands where vibration increases?

mrbigg

My Feedback: (21)

I've never noticed them to be any worse than a DA, ZDZ, or other make of enigne. The ones I'm referring to though were both converted by Ralph. Are yours still running the mag?

pe reivers

Nodes are where resonance acts up. In this case the main node seems to be 900, secondary node 1800, tertiary node at 3600 etc. higher nodes are mostly smaller than the predecessor, so a very slight resonance might be still seen at 7200 (Ralp's idle rpm )

Pelle Gris

I beg to differ...:-) My recently acquired stock G-62 is very smooth, and idles at 1000 rpm with only very slight vibrations. It is however mounted in a sturdy 1:3 scale Tripacer, and equipped with a slightly cut down 26x8 wood prop, which is the reasons for the smooth running.
If mounted on a flimsy airframe, and equipped with a small propeller, the vibrations will be much worse.

It does however have a vibration "node" at mid rpm, where the wing struts suddenly appears twice as thick... :-) I have never measured the rpm at that spot, but it could easily be the one Pe predicts to be at around 3600 rpm.

flygilmore

My 62 is very smooth.....having heard all these stories I was expecting a paint shaker when I mounted it to my Giant Aeromaster. I admit the Aeromaster has lots of area to dissipate the vibes, but the engine is smooth as silk! Make sure you take time to balance both the prop tips and hub-tuned correctly all will be well.

Tired Old Man

My Feedback: (1)

To eliminate the harmonic vibration in a single would require adding about 6 pounds to the bottom end of 50 to 60cc engine. There is no escaping this with a single. Even a twin has a harmonic and the way to eliminate that is to add a half stroke, half displacement piston and cylinder oriented 90* to the primary cylinders centerline.