REFLECTOR: Franklin

[Brian Michalk]

Well, I don't know what the PMags will do as far as timing is concerned.

A person should time their mags for peak cylinder pressure to be at 
about 13 degrees ATD for cruise power.

Now no one that I know has cylinder pressure sensors, so you'll have to 
guess.  The Franklin has a range of 28 to 32 degrees BTDC.  32 degrees 
is the aggressive end, and the more advanced you go, the closer you get 
to detonation, but the better you get to economy or power.  You won't 
damage the engine by retarding the timing.  The engine was certified to 
make power in that range.  The less the advance, the later the pressure 
the less efficient your engine becomes.

Advance timing: highter CHT's, lower EGT's.  Possible detonation. 
Increasing power up to a point.

Retard timing: Lower CHT's, higher EGT's, decreasing power all the way 
to where the engine won't run anymore.

Have you flown yet?  Any data?  If so, are you having problems?  We need 
more info to help you out.  If this is a new install, go conservative, 
then dial it in later.

Larry Parham wrote:
> I did not ask my question correctly.  I have a Velocity Franklin 173 RGE 
> Catto 66X74.   Both mags are set at 32*.  The question is--- 1...What 
> are they supposed to be set at?  2...What happens when you set it closer 
> to 28*?  Thanks
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html