automotive heater cores and fans - delta-p
automotive heater cores and fans - delta-p
(OP)
I am now providing my mutant Corvair with a heater.
Since it started out as an air cooled vehicle, it never had provision for a heater core, and the original blower is long gone.
I acquired a heater blower assembly out of another Corvair, and a heater core out of one of the donor cars.
The blower doesn't seem to push much air through the heater core.
Perhaps it can't develop sufficient flow across the delta-p the heater core imposes?
Older heater cores had a much wider fin pattern. Have modern vehicles gone to fans that develop higher pressure than the old ones did?
Did I design myself into another corner?
Thanks
Jay
Since it started out as an air cooled vehicle, it never had provision for a heater core, and the original blower is long gone.
I acquired a heater blower assembly out of another Corvair, and a heater core out of one of the donor cars.
The blower doesn't seem to push much air through the heater core.
Perhaps it can't develop sufficient flow across the delta-p the heater core imposes?
Older heater cores had a much wider fin pattern. Have modern vehicles gone to fans that develop higher pressure than the old ones did?
Did I design myself into another corner?
Thanks
Jay
Jay Maechtlen
http://www.laserpubs.com/techcomm





RE: automotive heater cores and fans - delta-p
ISTR that the blower in the firewall only passed hot air to the defroster vents.
The hot air was supplied under pressure through a duct under the floor from the plenum on the hot/bottom side of the engine, provided that the engine thermostats had not failed yet again, leaving the vent/bypass dampers open.
I.e., the normal electric blower was not really rated for blowing through a heat exchanger at all.
There was an optional gasoline fired furnace, located in the front trunk, and fairly rare. But third parties continue to supply such things for any/all vehicles. See webasto.com and others.
Mike Halloran
Pembroke Pines, FL, USA
RE: automotive heater cores and fans - delta-p
Thanks - it did sink in that no Corvair heater ever pumped air through a heat exchanger, and they had help from the cooling fan.
Oh, well - it works well enough for now.
If I need more, I can ditch this one and use the blower assy out of the '98 Buick donor. That should have enough push!
Jay Maechtlen
http://www.laserpubs.com/techcomm
RE: automotive heater cores and fans - delta-p
David
Connect with me on LinkedIn. http://lnkd.in/fY7-QK
Quote: "If it ain't broke, I must not've fixed it good enough"
RE: automotive heater cores and fans - delta-p
Air conditioned 1985 - 1992 Volkswagen Jetta and Golfs use a very effective Bosch 4 speed squirrel cage blower assy which pushes plenty of air
While wreckers yards won't hold as many VW MkII's or the equivalent 1993 - 1998 MkIII models as domestic products, the extra search will be worth it
Tekton
RE: automotive heater cores and fans - delta-p
Jay Maechtlen
http://www.laserpubs.com/techcomm