Hilariously angry sounding Electrolux turbo brush

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Yes this is true Nar an Air driven turbo brush is different to an electric driven power brush. :)Which is why i prefer electric driven.

Their latest air driven powerheads are much improved too. And before you mention it Nar yes i have used them :)
 
Yes. For example powerhead can literally lift the carpet, turbine head not even close. This is just my own experience.
 
And mine Mike.When the power goes down to 900w max that's not gonna help the performance of turbo brushes.
 
the video of that hoover turbo brush ...

I love that video of the miele/dyson/hoover!

I have an inexplicable affliction for turbo brushes -- probably because I grew up with central vac with a turbo brush - so that's what I think of as a vacuum from my childhood.

In that video, the turbo brush is a "TK2". It is made by dupro in Switzerland (duepro.com). I have one of those - and would love a brand new one, but as far as I have researched, they are only sold in Australia anymore. I'm toying with importing one ...

Dupro also makes your electrolux turbo brush. I also have one that is very similar to the electrolux - and that is the "TK4" - the opening, turbine is pretty much the same.

In my unscientific observations with my central vac, the TK2 tends to be pretty consistent, doesn't easily stall or slow down, even on thicker / ultrasoft carpets. The TK4 seems like it spins faster, but pretty much only works on low pile rugs and frieze. It is like the TK2 has more torque.

(I also have 2 wessel werk turbines - a TK284 and a TK270).
 
The TK284 has the smallest orifice of all my turbo brushes - it is pretty much impossible to stall with my central vac. It sorta seals to the ultra soft carpet, but the brush still turns and it is usable.

The TK270 has a larger opening - so I presume more air flows through. It too doesn't really seem to stall - it like it everywhere except the ultra soft - it is difficult on the backstroke, but near impossible on the forward stroke. even though it is sealed down, it still is spinning.

I have been a bit OCD about these ;) Like seriously OCD - I've read patents from Wessel Werk and Dupro, learned about different turbines (e.g. the above electrolux and the TK4 from dupro use a Mitchell Turbine - which is supposed to do better with high flow low head (i.e. more airflow, less pressue), while the wessel werk and TK2 use a Pelton Wheel turbine - which doesn't need as much flow, but extract the energy from the pressure.

I do see that you can get different modular orifices for the TK284, but I have no clue where to start looking for these. I'm pretty sure mine has the smallest (I see a circle 3 in roman numerals in it).

I have a waterlift gauge. Measuring the pressure in the pipes via another valve, I found
- no hose, about 130+ IOW (motor rated for 134)
- hose only (1 3/8", smooth bore): 30 IOW
- TK2: 44-50 IOW (depending on if it is in the air or on the carpet)
- TK4: 38-44 IOW
- TK270: 40-46
- TK284: 48-52
- suction only carpet brush: 30-50

Now, the permanent filter had seen some use. I cleaned it out and tried again - the numbers were about 3-4 IOW higher, but I didn't write them down.

(This is with an old Beam 294, with a Lamb 116119 motor: specs are here http://dev.ametekfsm.com/Bulletins/116119-00.pdf )

Basically, more pressure in the pipe - approximately you can map the curves to airflow. BUT, the filter does restrict, so I'm sure the pressure readings would be higher above the filter, if I could measure it there.

Like I said, totally OCD :)
 

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