11-24-2019, 03:44 AM
I now have 4 of the 190 cfm Delta 120mm fans, and one of them is now employed on my ceiling, forcing air out of the Nicro 4" mushroom vent through a 4.75" to 4.0" cedar step down ring.
For over a decade I have been running a silverstone fm121 there, with an Arctic cool open frame counter rotating fan as a pusher fan that increased flow and reduced noise.
I Was pretty impressed with this combo.
However, The 190 cfm Delta fan is several orders of magnitude more effective at max speed, and at the same 0.55 amps as the other 2 fans at their max speed, is also more effective for about the same noise level. different pitch though.
The new semi screaming banshee Delta fan seems indifferent to the counter rotating fan at most rpms, and it likely just presents a restriction at medium to high rpm. I'll not bother employing the CR pusher fan anymore on the ceiling, and I gain a little more clearance for taking things off the shelf over front seats.
Lowest possible fan speed is somewhere around 0.06 amps, which is lower than the silverstone fm121s minimum of 0.09x. It is quieter too.
The 18 awg circuit feeding this fan could certainly be improved upon. When battery voltage is at 13.6v, and the fan cranked upto full speed, voltage at the voltage bucker on the fan is 11.91v, and the output is 11.61v, It moves an insane amount of air at 11.61 volts. There seems little need to upgrade the wiring for less voltage drop and even more air movement as it is loud and unpleasant enough at 11.61v. and it draws 1.65 amps at that voltage.
I might, perhaps, be able to resist feeding it 10AWG.
I have done the same series trimpot potentiometer with the main potentiometer as I did on the Papst fan, so that when I lower the main 10 turn pot all the way, the fan does not shut off. The full range of speed is achieved in about 1.25 of those turns, which is more convenient than 5 or 10 turns, but it is still easy to dial in a very low speed above the minimum, unlike 3/4 turn pots.
The fan will not start on its own at this minimum speed, but if I dial it to the lowest possible starting speed, 5.37 volts, then the fans spins a bit too fast and loud, and I don't intend on shutting it off often.
I have not yet adhered the voltage bucker to the fan with Amazing goop, or routed the wires. The Silverstone pot had the small 2 wire connector, so i wired that same connector to it, and I used a 4 wire connector, using only two wires as the power feed, so i can easily remove the fan from the wiring to clean it. If I wanted to pull down some wires or solder wires awkwardly over my head, I could have used all 4 wires in the 4 wire connector for both pot and power feed.
The cedar and walnut step down ring that I made in 2008, will likely get modified with my dremel and a rotary rasp to align more with the steering vanes and help reduce restriction, and perhaps noise.
The acrylic front window shroud with the poorly balanced Jaro fans, is also getting the Delta fans and the same minimum speed limiter. The rotatable grill which directs airflow down at Fiona, works much much better with the Delta fan than with the Jaro. The Jaro, the flow flattened out and spread wide and seemed to restrict the fan's flow a good amount while increasing noise, but with the Delta fan the flow stays in a narrow column but is directed at an angle away from fan face, and it does not seem diminished much at all by the rotatable grill's friction restriction and noise increase is not as pronounced as when th grille is placed infront of the Jaro.
The rear acrylic intake shroud 120Mm Jaro fan, will also be getting a Delta Fan Replacement.
I have acquired a 60 amp peak/ 40 amp constant PWM 21KHZ motor speed controller suitable for a brushed motor, like the Hvac blower motor Dodge installed. I want to see how much air this blower motor moves and amperage it uses at various speeds, and be able to power it with the engine off. I will perhaps wire it up more permanently so i have infinite speeds. instead of 4 stock speeds through the inefficient resistor packs. That project could get tabled for a bit though.
For over a decade I have been running a silverstone fm121 there, with an Arctic cool open frame counter rotating fan as a pusher fan that increased flow and reduced noise.
I Was pretty impressed with this combo.
However, The 190 cfm Delta fan is several orders of magnitude more effective at max speed, and at the same 0.55 amps as the other 2 fans at their max speed, is also more effective for about the same noise level. different pitch though.
The new semi screaming banshee Delta fan seems indifferent to the counter rotating fan at most rpms, and it likely just presents a restriction at medium to high rpm. I'll not bother employing the CR pusher fan anymore on the ceiling, and I gain a little more clearance for taking things off the shelf over front seats.
Lowest possible fan speed is somewhere around 0.06 amps, which is lower than the silverstone fm121s minimum of 0.09x. It is quieter too.
The 18 awg circuit feeding this fan could certainly be improved upon. When battery voltage is at 13.6v, and the fan cranked upto full speed, voltage at the voltage bucker on the fan is 11.91v, and the output is 11.61v, It moves an insane amount of air at 11.61 volts. There seems little need to upgrade the wiring for less voltage drop and even more air movement as it is loud and unpleasant enough at 11.61v. and it draws 1.65 amps at that voltage.
I might, perhaps, be able to resist feeding it 10AWG.
I have done the same series trimpot potentiometer with the main potentiometer as I did on the Papst fan, so that when I lower the main 10 turn pot all the way, the fan does not shut off. The full range of speed is achieved in about 1.25 of those turns, which is more convenient than 5 or 10 turns, but it is still easy to dial in a very low speed above the minimum, unlike 3/4 turn pots.
The fan will not start on its own at this minimum speed, but if I dial it to the lowest possible starting speed, 5.37 volts, then the fans spins a bit too fast and loud, and I don't intend on shutting it off often.
I have not yet adhered the voltage bucker to the fan with Amazing goop, or routed the wires. The Silverstone pot had the small 2 wire connector, so i wired that same connector to it, and I used a 4 wire connector, using only two wires as the power feed, so i can easily remove the fan from the wiring to clean it. If I wanted to pull down some wires or solder wires awkwardly over my head, I could have used all 4 wires in the 4 wire connector for both pot and power feed.
The cedar and walnut step down ring that I made in 2008, will likely get modified with my dremel and a rotary rasp to align more with the steering vanes and help reduce restriction, and perhaps noise.
The acrylic front window shroud with the poorly balanced Jaro fans, is also getting the Delta fans and the same minimum speed limiter. The rotatable grill which directs airflow down at Fiona, works much much better with the Delta fan than with the Jaro. The Jaro, the flow flattened out and spread wide and seemed to restrict the fan's flow a good amount while increasing noise, but with the Delta fan the flow stays in a narrow column but is directed at an angle away from fan face, and it does not seem diminished much at all by the rotatable grill's friction restriction and noise increase is not as pronounced as when th grille is placed infront of the Jaro.
The rear acrylic intake shroud 120Mm Jaro fan, will also be getting a Delta Fan Replacement.
I have acquired a 60 amp peak/ 40 amp constant PWM 21KHZ motor speed controller suitable for a brushed motor, like the Hvac blower motor Dodge installed. I want to see how much air this blower motor moves and amperage it uses at various speeds, and be able to power it with the engine off. I will perhaps wire it up more permanently so i have infinite speeds. instead of 4 stock speeds through the inefficient resistor packs. That project could get tabled for a bit though.
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