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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: 360 temperature question?

John:

**First, quit running LOP. Try high MAP, low RPM (oversquare, like 27", 
2200)
for a few hours. **

The recorded internal cylinder pressure data suggests that that is an 
ill-advised concept.   High MP, Low RPMs when ROP results in 
exceedingly high internal cylinder pressures and, to make matters 
worse, they are closer to TDC.  This is NOT what you want during 
breakin.

What you want are high MEAN pressures (high HP) with cool CHTs (LOP and 
the peak pressure further form TDC.  This seats the rings using high 
mean pressures but with lower PEAK pressures out of the choke area.  
Placing high peak pressures high in the cylinder in the choke area is 
not what you want to have happen.  We break in engines at very high 
power settings (above 80%), LOP.  This works best to accomplish quick 
ring seating in the area of the cylinder where it is most advantageous 
and keeps them from being over heated.

Walter