Impulse coupler tangs
Well, not exactly Larry... it's actually a little lower than that, around 800 to 1000 RPM with the cowl flaps open and you stay in this range until the oil temp starts to come up. In this RPM range the mag impulsers stop clicking, reducing the wear on the little tangs or ears... and it also brings the timing up to 20 deg from the retarded condition, which also helps bring on more heat. After the temp comes off the cold end of the gage, then you can bring the engine up to say 1100 or so for warming on an especially cold day.
SkyKing
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