Agreed on that. I put my cleaned case together (Upper and Lower Case and inside Blower Case) to see where the cage and the inner case come together. Naturally, they don't touch, but they do come pretty close to each other. I see no improvements over the factory design that would help anything there.It may be a function of the blade fin angles and width. It's not a centrifugal pump per se, so a tight clearance to the casing isn't a concern nor necessary.
So your saying VB the gap between the bottom of the blower wheel and the heaterbox is not a concern?It may be a function of the blade fin angles and width. It's not a centrifugal pump per se, so a tight clearance to the casing isn't a concern nor necessary.
I got a feeling once all the holes are sealed and the trash is removed with heater/evap cores cleaned out, the air flow will be sufficient. It doesn't take much to degrade the stock fan performance. The only other way I could think of is somehow getting more power to the fan to spin it faster. There are limits to the speed however.
Squirrel cage fans don't take much to kill flow. They dead head easy but since they're not in a fluid, they don't have to worry about heatup for the most part. The funky thing with the G-bodies is that the motor gets cooled by the fan tube so even if your evap or heater core gets clogged or the foam falls out of the HVAC system and clogs up the vents, the air will still flow to the motor. So it can sit and spin all day long without burning up and you STILL won't get good flow.
It'll also be good to replace the resistors and make sure the wiring contacts are clean and tight. Old wiring and shiit takes their toll on resistance (increase) over the years which can slow down your fan motor. Your results may vary.
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