rowdy141
Well-known member
Kirby’s initial attempt at a disposable-bag system (Kirby Tradition) was reputedly flawed by an undersized fill-tube. This supposedly restricts airflow, causing a bottleneck and loss of efficiency. The common remedy is to change the em-tor/tube assembly for one with a larger diameter.
I’m wondering whether this is a false impression, or perhaps limited to USA models?
I can’t see design engineers at Kirby making such an error; they had a blank canvas to design these and must have experimented with prototypes. I suspect they deliberately chose to make the tube narrower than the ducting because when air flows from the fan and reaches the smaller-diameter fill-tube, it increases in pressure, moves up the tube faster, and carries heavier particles with it. When the air reaches the top of the tube, pressure’s reduced, and the particles fall into the bag.
Machines manufactured for export (UK) don’t have fast/slow motor speeds. Ours run at high speed all the time, for both brushroll-head and hose. Could this modification be more applicable to USA models where the fan speed was slower?
Newer, wider fill-tubes (Heritage onwards) occupy more of the space within the cloth bag, so paper bags now need replacing more frequently. Consumables, as we know, have the longest return profit wise.
I’m wondering whether this is a false impression, or perhaps limited to USA models?
I can’t see design engineers at Kirby making such an error; they had a blank canvas to design these and must have experimented with prototypes. I suspect they deliberately chose to make the tube narrower than the ducting because when air flows from the fan and reaches the smaller-diameter fill-tube, it increases in pressure, moves up the tube faster, and carries heavier particles with it. When the air reaches the top of the tube, pressure’s reduced, and the particles fall into the bag.
Machines manufactured for export (UK) don’t have fast/slow motor speeds. Ours run at high speed all the time, for both brushroll-head and hose. Could this modification be more applicable to USA models where the fan speed was slower?
Newer, wider fill-tubes (Heritage onwards) occupy more of the space within the cloth bag, so paper bags now need replacing more frequently. Consumables, as we know, have the longest return profit wise.