I installed my EGT probes tonight. Dynon recommends 2-8″ from the exhaust flange. The precise distance isn’t important, but it’s very important that the distances are the same for each cylinder since that lets you compare EGT readings across cylinders. Anything over 2″ on my exhaust setup would put the probes past the first bends, and it would be hard to remain accurate on the measurements. These constraints pretty much dictated that my EGT probes would be at exactly 2″ from the exhaust flange. I positioned the probes so that they stick straight out from the sides of the pipes. I’ve seen a lot of builders angle these one way or the other to try and keep them from sticking out so far, but there is plenty of clearance from the cowl sides and this keeps them from interfering with other things like the lower spark plugs.
