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The clockwise rotation of the fan and its position above the engine means the directional flow of air leaving the fan is primarily focused on the 4-5-6 side of the engine. Were the fan mounted below the engine and rotating in the same direction, the 1-2-3 side would receive the greater volume of air. The air deflector serves its namesake by diverting air to more evenly distribute flow over all cylinders.
If you were interested in proving this, the plugs should reveal the temperature each cylinder is running at. So without a deflector, the plugs on the 1-2-3 side should show a hotter color to them compared to the 4-5-6 plugs.
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Karl ~~~
Current: '80 Silver Targa w /'85 3.2. 964 cams, SSI, Dansk 2 in 1 out muf, custom fuel feed with spin on filter
Prior: '77 Copper 924. '73 Black 914. '74 White Carrera. '79 Silver, Black, Anthracite 930s.
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