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Re: High Volume Heater Blower #'s
Posted by: gnvair ()
Date: February 02, 2018 06:26AM

I only ran a HD/high volume blower motor on one late Corvair and it melted the orange wire. Ever since I have ran stock GM blower motors. A detail that I do it use a pin oiler and oil the shaft bearings. The low bearing that is sealed is an easy fix. I drill a small hole, drip some oil in and then solder the hole shut. The secret to making the heater work is to make sure the long duct under the floor is sealed up (I use seam sealer on all the edges) and seal the connections where the duct pieces join with foam weatherstrip from Home Depot/Lowes..On a sub 20 degree day it will roast you out. And that is with the blower the car was built with in 1966. Corvair heaters work great if you take the time sealing them up so the hot air isn't lost before it reaches the interior.

Lee J



Edited 2 time(s). Last edit at 02/02/2018 06:28AM by gnvair.

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Re: High Volume Heater Blower #'s
Posted by: jjohnsonjo ()
Date: February 02, 2018 07:18AM

""Exactly what I thought but is a permanent magnet motor a superior piece or just a different design and equal in performance? ""

The new permanent magnetic motors are very efficient compared to old DC motors. Because of things like rechargeable drills and other tools they are getting to be the norm. Also, the cost of copper and shipping weight costs continue to climb. So it cheaper to make a better motor for less with strong magnets that will put out more power with less current.

"" So would you suggest a 10 amp. fuse would adequately protect this motor with a 12 ga. wire?""

You should use a "slow blow" there is a large surge with these motors. I would start with 10 and see how it works. If not, its the start surge, try 12 or 15, The surge will not long enough to cook a wire. Also, as has been mentioned, start it on low then turn up.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: High Volume Heater Blower #'s
Posted by: aircooled6 ()
Date: February 02, 2018 08:59AM

GNvair (Lee) - Melted the orange wire ---thus the idea of using a relay in the rear. The current draw on all that old wire up to the switch and back to the motor is pretty heavy. If you put a relay in the engine room and run a separate piece of 12 or 10 gage wire to the motor from there, the melting issue is abated and max current is available to the motor. The long wire from the switch is then carrying only the tiny amount of juice required to activate the relay coil. As I mentioned elsewhere, I only use binary for the blower - its either on or off, so that simplifies the wiring of the relay a bit.

Everett Wilson
North Richland Hills TX
(Now, South of 820!!)
64 Greenbrier 110 with 95 heads/PG

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Re: High Volume Heater Blower #'s
Posted by: 66vairman ()
Date: February 02, 2018 09:35AM

Interesting comments - Years ago this was covered and yes the A/C fan for the front blower does turn reverse and is available. In fact a few incorrectly used this fan for the heater. Yes it works, but not as efficient since the air flow rotates opposite of housing exit.

The fuse panel specifies a 10Amp fuse for cars with only a heater and 20Amp fuse for cars with A/C and a heater.

The 12ga wire can handle 20Amps without over heating or the insulation melting. Not sure what caused Lee J's problem. (I have an A/C car with the 20Amp fuse with the newer heater fan motor - no problems).

Steve G. is correct about the negatives of fan startup at full power. Starting from OFF to LOW, MED, HI and allowing a for the fan to come up to speed at each setting (less than a second) reduces current surge and arching of the fan switch contacts.

Yes some of the new permanent magnet motors have a sligthly longer shaft. Installing a washer under the fan cage nut takes care of the issue.

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Re: High Volume Heater Blower #'s
Posted by: Bob Helt ()
Date: February 03, 2018 11:18AM

Lee said: And that is with the blower the car was built with in 1966. Corvair heaters work great if you take the time sealing them up so the hot air isn't lost before it reaches the interior.

Bob adds his opinion.

But don't use METAL 4" hose as is used for home clothes dryers. Get the correct rubberized fabric hoses.
Bob Helt

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