skywagon8a
MEMBER
SE Mass MA6
I’m not quite sure what “mapping my leaning authority” means. If I get to say 50 degrees LOP or leaner my CHT’s go down. But 99% of the time I run about 50 ROP. Last flight, 70 degrees OAT, 2050 & 20.5”, 7900’ density altitude, running at about 390 CHT on all 4 cyl.
Ted, can you get a 150 degree EGT rise from full rich when you lean the mixture? If not perhaps you should consider having your nozzles reworked by these folks. https://airflowperformance.comThank you for the description of “leaning authority.” I have an injected engine, so no carb to fiddle with.
i will confuse to experiment w airflow changes, though the internal vane mentioned and pictured in my PDF is my last, current at least, idea.
As you say, high Hp and slow speeds are ultimately a problem. Couple that with starting density altitudes exceeding 7,500’ even at dawn and one has a hot engine!
This is their procedure for tuning the nozzles. https://airflowperformance.com/wp-content/uploads/2015/12/Nozzle-Tuning-Instructions.pdf
" 2050 & 20.5”, 7900’ density altitude, running at about 390 CHT on all 4 cyl." This is a very low power setting for such a high CHT. Fuel cools.