182L 470 eng, JPI monitor, high CHT #4
I am flying a 182 L with the 470. No turbo etc. I have the JPI engine monitor, and upgraded from 700 to 730. Uses the bayonet probes on all cylinders except for a gasket sensor on #4. I know it is supposed to read higher as it is on/mounted with the spark plug. Mike Busch recommends temps below 380 for the continental engines. In climb, all CHTs are about 370, but #4 is over 400. In cruise, 8000-9000 msl, CHTs in 330-340 except #4. I have been leaving a bit of cowl flap open to keep lower. About 50% cowl flaps gives #4 just about 380. So the question: If all bayonet sensing cylinders are good and the gasket sensor cylinder is 50-75 higher, is it OK to disregard and close the cowl flaps? spoke to JPI, they just say expect 50-100 degrees higher on the gasket probe cylinder. they don't (won't) say that is acceptable.