With a little over 35 hours now on the ship, I believe I have some firm numbers. I have a Vetterman's exhaust with mufflers and the thinking was the mufflers were taking up too much room by the cowl exit and making the temps run high. I had them send me straight pipes and took the mufflers off and just used the straight exhaust. I really couldn't tell the difference in noise level between the two. We used a pressure differential test by putting one end at the back of cylinder 4 facing towards the middle of the engine (so as not to get ram air) and ran the tube through the back of the baffling where we have the vent for the mag cooling, then back into the cabin through the heater vent, into the measuring board back out the vent into the bottom of the cowl by the oil cooler. We were getting between 6-10" of change, depending on the speed and altitude, all really good.
Once we knew the pressure was good, we landed and removed all of the testing equipment. Now it was time to log the aerobatics. A good friend of mine has a RV-6 with thousands of hours and hundreds doing aerobatics. I let him do them, while I watched from the ground. All were done, including Lazy 8, Aileron Roll (R&L), Barrel Roll (R&L), Loop, Cuban 8, Reverse Cuban 8, Split S, Vertical Roll (R&L) and Immelmann. All were performed with +G and did not exceed 3.25Gs. He also did Spins (R&L). Having spun his 6 numerous times, he said the spins were very gentle compared to his 6.
The next day I took the plane on a short cross country, 1.25 hrs each way and the temps were great. Averaging 169kts at 63% in cruise @ 8500', oil temp was 193?, CHTs 321-353?, running about 50? LOP and burning 9.6GPH. Ground temps at takeoff around 90? and at altitude OAT was 53?.
Once we knew the pressure was good, we landed and removed all of the testing equipment. Now it was time to log the aerobatics. A good friend of mine has a RV-6 with thousands of hours and hundreds doing aerobatics. I let him do them, while I watched from the ground. All were done, including Lazy 8, Aileron Roll (R&L), Barrel Roll (R&L), Loop, Cuban 8, Reverse Cuban 8, Split S, Vertical Roll (R&L) and Immelmann. All were performed with +G and did not exceed 3.25Gs. He also did Spins (R&L). Having spun his 6 numerous times, he said the spins were very gentle compared to his 6.
The next day I took the plane on a short cross country, 1.25 hrs each way and the temps were great. Averaging 169kts at 63% in cruise @ 8500', oil temp was 193?, CHTs 321-353?, running about 50? LOP and burning 9.6GPH. Ground temps at takeoff around 90? and at altitude OAT was 53?.