Since the local elevation is about 6500 feet and the trike was originally set up at a somewhat lower altitude, It was not surprising to find a lot of carbon buildup on the plugs after 6 or so hours of running. I changed the main jets from 165s to 158s and that seemed to make for better running at higher rpm without higher EGT. Idle and fast idle were still rough so I moved the needle clips up to the next to leanest groove. This improved smoothness at high idle alright but EGT went up, particularly at cruise RPM. So I backed down a notch. At this point, the fact that one side of the Dual EGT was reading hot while the other was not came into play. (This existed from the time I first saw the trike run.) Switching probes from one side to the other did not change which gauge side read high versus low so that pretty much meant it was a gauge problem.I tried to use the gauge from the Redback 503 but the connectors were wrong. I tried to use the probes from the Redback but they were a different size. Finally I found out I could use the exhaust manifold bushings from the 503 on the 582 so I could use the 503's probes and gauge. To my surprise, I still had the same problem. One side of the Redback's EGT persisted in readying high. So which reading was right? I finally rigged up a digital DMM that had a type K T/C input and attached it to a leg board. Turned out that probes on both sides were showing about 1275 at cruise rpm (5400). So, I took the needle clips back to the lowest level. This brought both probe readings to around 1165 in climb and 1185 in cruise. Now to get a good replacement dual EGT gauge.
In the process of pulling the top of the Outback's carbs, I noticed the O-rings were badly cracked. I thus stole the O-rings from the gyro to fix this problem. I think I now have 7 Bing 54 carbs. I ordered 4 carb seal kits which just arrived so the gyro MZ engine with get its carb O-rings back shortly. The Mallard 447 will also get a new throttle cable boot.
In the process of this testing, we are now up to about 10 hours on the rebuilt engine and about 50 landings.
In the process of pulling the top of the Outback's carbs, I noticed the O-rings were badly cracked. I thus stole the O-rings from the gyro to fix this problem. I think I now have 7 Bing 54 carbs. I ordered 4 carb seal kits which just arrived so the gyro MZ engine with get its carb O-rings back shortly. The Mallard 447 will also get a new throttle cable boot.
In the process of this testing, we are now up to about 10 hours on the rebuilt engine and about 50 landings.
