There has been some discussion about this subject lately and this is what was taught to me about "Recriprocating Load" by folks who made a living instructing and flying large radials in the military and airlines.  

1.  "Pull the RPM back (maybe as low as 1200) and then add a little throttle."  

2.  "One inch of manifold pressure for 100 rpm. A good number is 15-15" (15"/1500 RPM).  As I've been reminded "Never go under square."

3.  Use "cruise RPM on downwind". 

4.  "If you need RPM, get it before adding throttle." (Overboost can cause an immediate problem while underboost works more slowly, but with the same final results.)

5.  The torquemeter (if available) lets you see what you are doing.  I have always been more comfortable using the "Never go under square" rule.   

5.  "Good planning should be used to avoid having to pull the throttle back and point it at the ground.  The E6B is your friend.  There is nothing wrong with using gear and flaps to get slowed down or even a 360.

6.  "Always dirty up before you start down if you think you'll need it."  I was reminded that this "may not go over to well with ATC".  

Hope this helps you folks who are struggling with some of the engine concepts involved with flying the PMDG DC-6.  I've found it to be a great airplane and fun to fly.  

 

Thanks for sharing your knowledge! I'm already flying to these "rules", good to know that I'm on the right track!  My engines now have about 35 hours, and they're still green. The PMDG DC-6 indeed is a real joy to fly!