Engine vibration with advanced ignition.

[abripl[_2_]]

Been flying my canard for a few years now - it has a Franklin 6-350
engine and LSE dual ignition. I often noticed a slightly extra engine
vibs in the 2500-2700RPM range (maybe its my imagination) and I used
to fly it 2400rpm or less. All this time I had the ignition advanced
probably an extra 5 degrees to get a little more power. Recently I
changed the plugs on it and at same retarded the ignition to standard
recommended TDC setting. Now it seems the engine is more uniformly
smooth in the whole range. Did two test flights.

Can extra advance add to engine vibs? Any A&Ps out there?
-----------------------------------------------------------
SQ2000 Canard http://www.abri.com/sq2000

[Denny]

The good thing from advanced timing is detonation which hammers those
nasty lead deposits out of there, along with the top of the piston..

denny

[Tech Support]

On Wed, 17 Sep 2008 21:59:59 -0700 (PDT), abripl >
wrote:

>Been flying my canard for a few years now - it has a Franklin 6-350
>engine and LSE dual ignition. I often noticed a slightly extra engine
>vibs in the 2500-2700RPM range (maybe its my imagination) and I used
>to fly it 2400rpm or less. All this time I had the ignition advanced
>probably an extra 5 degrees to get a little more power. Recently I
>changed the plugs on it and at same retarded the ignition to standard
>recommended TDC setting. Now it seems the engine is more uniformly
>smooth in the whole range. Did two test flights.
>
>Can extra advance add to engine vibs? Any A&Ps out there?
>-----------------------------------------------------------
>SQ2000 Canard http://www.abri.com/sq2000
************************************************** **************************

Don't know how old this posting is, but with ur spark advanced, you
might be getting detonation???? WAG

Big John