The values we specify to our customers buying our industrial engines but designing their own cooling systems using a puller fan are 1/2 to 2/3 (2/3 is the target) of the blade width inside the shroud and radial clearance set to the minimum required to prevent interference. We ask for 10-20mm depending on whether the engine is mounted solidly or on isolators.
Just an FYI for what we do for cooling system design.
-Matt
Great information. That said i would have to find a way to move the fan closer to the engine. Unfortunately I just bought a new clutch when i did my engine. That included adding a new radiator which was thicker thus moving the shroud backwards.
Any ideas which clutch fan would work?
Sent from my SAMSUNG-SM-G930A using Tapatalk