lakespookie wrote:I really think you need to examine your inlet vs outlet area and how you are routing the radiator air volume, I know rotaxs are not primarily air cooled but i suspect that a lower cowl entrance when the cowl is on is causing a high pressure at the exit and limiting your overall airflow unless you have that volume of inlet air segregated from the upper plenum inlet and exhaust air.
This is not a traditional front or even side mounted radiator (the largest Rotax supply) - its sort of belly mounted, in that it is located at the bottom of the firewall but designed to be incorporated into the cowling (https://webuildplanes.com/cliff-jarvis/). The concept is that of a pressurised/sealed cowlin, with all exit air going out via the radiator
If you are running with no cowls you are making it worse. .
The no cowl runs demonstrated that the cooling systems oil, coolant & fins, are all working - to the point where suboptimal operating temperatures were recorded
Also with the extra inlet i would confirm your exit to entrance ratio is 3 to 1 at a minumum
See above comment - we are trying to get away from this ratio (foolish?)
Just out of curiosity what is your Radiator size/area? i think the Current factory experiment with the 1 week wonder used split rads to add extra cooling volume and also to simplify some of the concerns with plenum exit pressurization but i could be wrong and i dont necessarily trust my goldfish brain.
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