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flatheadmurre · 12-26-2019, 04:42 AM

First do you plan on running a fan shroud ?
That 3 blade fan is designed and works well without one...so it has an advantage right there compared to a truckfan.
The modern flexblade fans are designed to use with a shroud...most fans that have a straightcut edge are performing best running against a shroud.
Flow in the system isn´t dictating the fan...it´s more about Power/effiency of the engine that sets the need for cooling...and the the core itself how much suction you actually need to pull the air through it.
You can have a fan that pulls a lot of air but if it can´t handle a thick core it won´t work in the end.
So Flow of air and static pressure is the 2 things you need to calculate.

12-26-2019, 04:42 AM	#13
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: 3 blades verses 6 First do you plan on running a fan shroud ? That 3 blade fan is designed and works well without one...so it has an advantage right there compared to a truckfan. The modern flexblade fans are designed to use with a shroud...most fans that have a straightcut edge are performing best running against a shroud. Flow in the system isn´t dictating the fan...it´s more about Power/effiency of the engine that sets the need for cooling...and the the core itself how much suction you actually need to pull the air through it. You can have a fan that pulls a lot of air but if it can´t handle a thick core it won´t work in the end. So Flow of air and static pressure is the 2 things you need to calculate.