EPI-AIR DUCT again
I have to say a few more words about this, because it is so thrilling to see the results. Temp measuring showed very promising values, but as done with the contactless laser gauge I was not quite satisfied. These results vary a lot depending on where exactly you point at.
I wanted to know more about the air flow, so I made a short scientific experiment. The measuring points were chosen in "X" form, center and four corners.The lower corners were at the hight of the lowest shutter flap not at the bottom of the radiator.
Set up was static of course. Engine revs 1000, 1500 and with airduct 2000. Before the experiment I thought the flow rate would go up all over the radiator section, but it went up in the upper corners mainly. The center did not change much, which appears logical after finding out. Right in front of the fan, there is no false air coming from the sides, the easiest way for the air is through the radiator. The more you move out, the higher the content of false air is.
Also interesting, although understandable , the poor results in the lower area of the radiator, I presume that the lower 5-10 cms of the radiator are completely out of operation, when the car is standing.
As Mark said, if the gain of efficiency still is too small, one could build an air duct covering the full surface of the radiator.
Simplified calculation: the air flow jumps from 2 m/sec to 3,7 m/sec at idling, based on fan diameter the volume increases from 13.400 liters/min to 23.800 liters/min (80%) this explains, why the radiator output is so much better when the car is standing.
By the way, the device now is approved up to 190 km/h on the Autobahn.
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Flaminia GT 3C, Flaminia Convertibile 3C, Flavia Convertibile 1.8, A112 Abarth, Flaminia Coupé 2.5, Fulvia Sport 1.3S, Unimog U900
Last edited by Tedesco; 08-22-2014 at 08:56 AM.