As a follow up on my high oil temps. Last Saturday, we taped close the RV6 style air intake opening on my KR2. This air intake was to feed fresh air to my Zenith carb. (My understanding is that carb is not capable of high velosity air via a enclosed tube ram air style intake. So I do not believe I can seal that carb in a intake tube type configuration.) ( thats another conversation)
The purpose of this test was to test the possiblity that intake air was disturbing the low pressure side of the engine. The limited flight results seemed to indicate that my oil temps came down from 230-240 to about 220. Still high but initially better. However, we now belief that we may have raised the CHT's We then added an additional lip to the lower cowl exits existing lip. This lip was made of alum and extended about 2.5 inches past the existing lip. In the first test we bent the lip (about 30-35 degrees) up toward the lower fuse effectively decreasing the exit opening of the lower cowl. This seemed to have no effect on oil temps. So we tried opening the lip about 30-35 degrees. Again, we could see no effect on oil temps. Now are thoughts are around the idea that my oil pump needs to have a severe duty spring in it. I do not know if it currently has a severe duty spring, a heavy duty spring or standard spring in the GPAS 2180 VW engine. Are thoughts on this are around the idea of oil pressure and your previous words to me regarding oil pressure. I also have a remote oil filter and understand from the GPAS site that I should have a severe duty spring when using a remote oil filter. I am also suspect of the routing of my remote oil filter supply lines as they come in close contact with my exhaust pipes. My pipes are ceramic coated by Jet Hot but I think there is still heat transfer going on and especially if my oil pressure is lower, the slow flow would allow greater heat transfer. I have fire sleeve on the lines but do not have true heat shields. So, I will re-route the remote oil supply lines. Add heat shielding to the supply lines and the exhaust were they come in near contact. Then test fly and see the results. I am also considering by passing the remote oil filter and seeing what happens. I am also going to do an oil change to insure I have the right viscosity. Your thoughts. Jeff York KR-2 Georgetown Airport for 2012 Gathering?
