Recommended TIT CHT Temps for Cruise

[Jerry De Santis]

I have a 1975 P337G Riley with A/C, intercoolers etc. I general cruise at 70 percent power and front and back engine cylinders are normal between 310 F to 385 F and CHT's in front engine between 1350 F and 1425 and in the rear engine between 1380 to 1525 F. I generally have 1.5 to 2 gph fuel flow more for rear engine than the front. Oil temp in front engine from 180 to 190 and in the rear engine 160 to 180. That's right, my oil temp. is lower in rear engine. I have good compression on all cylinders and about 600 hours over TBO. I cange oil every 25 to 50 hours depending on my schedule. I like running engines cool.

Jerry
N34EC