I’ll just chime in with my opinion for what it’s worth...
Electric fans CAN work but it’s difficult to get right.
Firstly, although the mechanical fan may “move” like 8000cfm or whatever people have calculated their efficiency is massively reduced due to the gap around the shroud, so the actual CFM through the radiator core won’t be anywhere near that high.
Now I’m not saying mechanic is bad, obviously it works perfectly well...
For electric fans to work they need to have a correctly designed shroud and the right power to move enough air. There are electric thermofan shrouds you can retrofit from late model BMW V8s that are rated at 80amp and will EASILY move enough air (albeit that they are noisy at full tilt).
One of the issues with cooling a 4WD/80 series is the design of the front grill. Basically you want to build up high pressure in front of the radiator when moving along at speed, most cars have scoops and ducting to keep the air “contained” and run little flaps on the underside which help create low pressure in the engine bay, this in turns help move air through the rads. On my road car I can get more airflow through the rads at 45kph compared to 80am high efficiency fans... (I have actually measured this scientifically).
The solution that works best for me was to run 2 Toyota Camery “pusher” fans on the front of the a/c condenser and a pair of OEM electric fans behind the radiator (specifically from a AU falcon). They are PWM controlled based on temp (eg every degree above 80c increases fan speed by 5%) and so far I haven’t had any issues in hot Australian summers. I’ll try and post some pics up shortly....
Electric fans CAN work but it’s difficult to get right.
Firstly, although the mechanical fan may “move” like 8000cfm or whatever people have calculated their efficiency is massively reduced due to the gap around the shroud, so the actual CFM through the radiator core won’t be anywhere near that high.
Now I’m not saying mechanic is bad, obviously it works perfectly well...
For electric fans to work they need to have a correctly designed shroud and the right power to move enough air. There are electric thermofan shrouds you can retrofit from late model BMW V8s that are rated at 80amp and will EASILY move enough air (albeit that they are noisy at full tilt).
One of the issues with cooling a 4WD/80 series is the design of the front grill. Basically you want to build up high pressure in front of the radiator when moving along at speed, most cars have scoops and ducting to keep the air “contained” and run little flaps on the underside which help create low pressure in the engine bay, this in turns help move air through the rads. On my road car I can get more airflow through the rads at 45kph compared to 80am high efficiency fans... (I have actually measured this scientifically).
The solution that works best for me was to run 2 Toyota Camery “pusher” fans on the front of the a/c condenser and a pair of OEM electric fans behind the radiator (specifically from a AU falcon). They are PWM controlled based on temp (eg every degree above 80c increases fan speed by 5%) and so far I haven’t had any issues in hot Australian summers. I’ll try and post some pics up shortly....