![]() If it is too far rearward out of the shroud air will be pulled from around the blade tips. The fan ideally should fit one half of the pitch depth of the blade into the shroud opening. With the shroud form fitted to the radiator and wrapped closely around the fan blade, efficiency is increased greatly. ![]() Mechanical fans without shrouds tend to pull almost as much air from around the fan blade tips as they do through the core. The job of the fan shroud is to make the fan pull all its air through the radiator core. Increases in blade pitch are effective in improving airflow at a given rpm but excessive pitch angles create some concern about vibration. Air will take the path of least resistance therefore following these instructions will force it through the radiator.īlade pitch is the angle of the blade in relation to the air stream it is measured in inches from the fan mounting surface to the height of the leading edge of the blade. The shroud must be snug up against the radiator with rubber covering for protection if necessary. Multiple spacers may be used, up to a maximum of 3". You may need special spacers to position the belt-driven fan properly. (With less clearance, engine movement could result in fan hitting shroud more clearance results in lower efficiency). Blade Tip Clearances:Įnsure proper clearances 3/4" from outer edge of the fan blade to the shroud (not always the fan shroud). To rear of fan:ġ/2" minimum from the trailing edge of the fan to the pulleys and belts. 1" minimum from the leading edge of the fan to the radiator core or closest obstruction.
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