Sunriver Ken
Well Known Member
I have an O-360 and electronic ignition in my RV-9A (which I did not build). The oil cooler is mounted immediately aft of the left rear cylinder with a door that, when opened rearward, allows air to pass from the baffled engine area through it to cool the oil. With the door shut virtually no air passes through the cooler.
At cruise EGTs run plus or minus 15F but the CHT for the left-rear cylinder is consistently 30F-50F higher than the other cylinders. Good or bad I have trouble getting my oil temperatures, at cruise (9-11K ft.) and leaned, above 160F even with the door closed. It is in this configuration the CHT is 30F-50F higher than the other cylinders. I did not try opening the door to enable more cooling air but doubt if that would lower the CHT.
So, my goal is to raise oil temperature while reducing the CHT of the left-rear cylinder. Any suggestions?
At cruise EGTs run plus or minus 15F but the CHT for the left-rear cylinder is consistently 30F-50F higher than the other cylinders. Good or bad I have trouble getting my oil temperatures, at cruise (9-11K ft.) and leaned, above 160F even with the door closed. It is in this configuration the CHT is 30F-50F higher than the other cylinders. I did not try opening the door to enable more cooling air but doubt if that would lower the CHT.
So, my goal is to raise oil temperature while reducing the CHT of the left-rear cylinder. Any suggestions?