In my -7A, I use an O-360 with a fixed pitch Sensenich prop. My left ignition is a Slick mag to the bottom plugs. My right ignition is a Lightspeed Plasma II to the top plugs. The runup was normal after a longer than normal warmup because of a 25F outside temp. In the past during cruise my EGTs have run within 100 degrees F. With a little Carb Heat, I can get them within 50 degrees F.
Yesterday, my #1 cylinder EGT was about 150 degrees F low in cruise. I had leaned to peak and was running about 70% power with carb heat about 1/3 on. The OAT was -25F. After about an hour, I noticed that all 4 four cylinders were again within 50 degrees F.
Any ideas on the cause? Was the plug possibly fouled and then the lead was burned off?
Thanks,
Mike
Yesterday, my #1 cylinder EGT was about 150 degrees F low in cruise. I had leaned to peak and was running about 70% power with carb heat about 1/3 on. The OAT was -25F. After about an hour, I noticed that all 4 four cylinders were again within 50 degrees F.
Any ideas on the cause? Was the plug possibly fouled and then the lead was burned off?
Thanks,
Mike