Tidying up the final adjustments after phase 1 and still running into some higher temps than I would like. We've gotten the cht's below 400 in cruise but it's only on mild days (75 on the ground, 35-45 at altitude). We would like a little more buffer for when it gets hotter. Any suggestions welcome.
Taken at 5580 pressure alt:
At 158 kias - 16" total, 8.3" delta
At 140 kias - 12.3" total, 6.7" delta
At 120 kias - 9.4" total, 5" delta
Taken at 8240 pressure alt:
At 157 kias - 14.7" total, 7.9" delta
At 130 kias - 10.1" total, 5.5" delta
At 100 kias - 6.1" total, 3.25" delta
These show that the lower cowl has between 3 and 8" of pressure over the outside static pressure. We've verified by taking direct lower measurements instead of using the difference, and they confirm up to 8" of water on the lower cowl. Still need to get a temp guage I can put up there.
Sam James cowl with an IO375. Oil temp is 180-190 in cruise. Need to verify the timing still, but since it's electronic I need a night engine run in order to see the timing light flash. It should have been set at the builder but I want to verify. All 4 cylinders are within 5-10 degrees of each other. Will trim the air dams later to get the spread down, but for now would like to tackle finding 30 more degrees of cooling.
Taken at 5580 pressure alt:
At 158 kias - 16" total, 8.3" delta
At 140 kias - 12.3" total, 6.7" delta
At 120 kias - 9.4" total, 5" delta
Taken at 8240 pressure alt:
At 157 kias - 14.7" total, 7.9" delta
At 130 kias - 10.1" total, 5.5" delta
At 100 kias - 6.1" total, 3.25" delta
These show that the lower cowl has between 3 and 8" of pressure over the outside static pressure. We've verified by taking direct lower measurements instead of using the difference, and they confirm up to 8" of water on the lower cowl. Still need to get a temp guage I can put up there.
Sam James cowl with an IO375. Oil temp is 180-190 in cruise. Need to verify the timing still, but since it's electronic I need a night engine run in order to see the timing light flash. It should have been set at the builder but I want to verify. All 4 cylinders are within 5-10 degrees of each other. Will trim the air dams later to get the spread down, but for now would like to tackle finding 30 more degrees of cooling.