In most cases the reason for unequal operation of single cylinders in radial engines is the generation of an asymmetric fuel mixture ofthe carburetor. Both the lateral inlet of the premix into the intake tube and the slanted throttle blade at partial load are responsible for that.In practice, the rotating crankshaft in the central crankcase is just not a perfect mixer and distributor, as often assumed.Through the intake duct the fuel mixture arrives as fog at the edge of the duct leading into the crankcase. And even before any "mixing"the first cylinder sucks the “rich” fog of mixture. The engine always fires every other cylinder. However, the next but one cylinder does notreceive the same fat fuel mixture, etc. Thus, the effects depend very much on the distance between the inlet (centrally in the middle ofthe casing) and the position of the individual intake tubes. The larger this distance the better the mix is actually distributed up to "entering"one of the 5 intake tubes. This is the reason that the smaller 150-
Top row: note that the bottom cylinders run colder
Bottom rows: using an adjusted Turbulator
Operating the engine with too rich of a mixture will in almost all cases damage the spark plugs. Sometimes this is so serious that theignition coils are also damaged (especially that of the 4th cylinder -
You will not find a full size radial powered airplane of the cowled kind that is missing baffles. Air is lazy and will find the path of least resistance, meaning it will go everywhere but where it is needed: between the fins of your motor.
Furthermore we need to somehwo achieve a positive ratio of incoming to exiting parting. Meaning, your round opening of you cowl is most if not all cases exceeds the exit port by a multiple, creating a bottleneck design which hinders all heat management.
Our CAD designed and CNC cut baffles not only guarantee that your incoming port (surface area) is now as small as can be and therefore you create a rapid exit airflow inside your cowl, we are forcing the air to travel thorugh the fins at an accelerated speed.