REFLECTOR: Exhaust systems

[John Dibble]

At 2300 rpm/22" map, my EGT is 30 degrees higher on EI compared to the mag.  I'm
thinking that the EI timing needs to be advanced.  However the current EI "settings"
are already 4-5 degrees advanced beyond the 28 degrees specified for the Franklin
engine.  If I adjust the EI "settings" to 28 degrees, it's much rougher and backfires
on EI during run-up.  Any thoughts about using EGT/CHT to fine tune the timing?

John

Mike Pollock wrote:

> I also run LOP with an IO-360, but only to a maximum of 50 degrees LOP.  The
> soot is still there, but just not as dark.  The EI does nothing for the max
> EGT reading though.  I can get the same EGT with the mag as I can get with
> the EI.
>
> Mike