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I've been flying my EF Extra with ZDZ 180 Champion on RE3 pipes for the last 8 months. I have had some minor ups and downs with it, but when it runs good I have been VERY impressed.
My concern, I have a brown oil residue (using Red Line at 36:1) under the cowl in front of the gear. The leak appears to be from the head gaskets, but it could also be at the carb spacer. Has anyone else with ZDZ's had this issue? If it had a front carb I wouldn't think about it much as I would assume it is mainly from choking or running rich. With this rear carb I would not think I should be seeing this oily residue so far forward when I am using the RE3's with the outlet halfway back in the plane. I am using the ZDZ velocity stack and the carb is torqued adequately, have verified the cylinder head bolts are tight at 90 in lbs and it is not leaking at the exhaust headers or the pipe couplers. The velocity stack doesn't appear to have any residue inside of it.
Should I be concerned or do these tend to have some stray oil?
Thanks.
Trevor