heating without front airbox? pleaseeeeeeeee

[Porschekid962]

I am about 3/4ths of the way through stripping my 72 911t car and beginning the prep for bodywork and paint. My big question is, can I get heat from some home made heat exchangers on top of race headers by simply ducting air from the front air vent in the hood, back to the HE and then into the cabin (namely on the front windshield for defrost) ? Does anyone have a system somewhat close to this in an extreme street car/track car??

My plans are to have a fresh air vent either under the car on the heat exchanger with a small fan or duct air from the front hood vent to the HE and then back to the cabin. The heat exchangers will be rather tiny, perhaps bolts on, bolt off just enough to clear up the windscreen and provide a little heat. Any comments, ideas, solutions?

[widebody911]

I don't know about getting air all the way to the back of the car, and then all the way back to the front. Why not just use the heater backdate pieces, and just duct from where the heater outlets in the front footwell/quarter area up through dash to the windshield?

[oldE]

Pkid962,
The normal flow of air is: From the cooling fan on the engine, some air is channeled through the heat exchangers on the headers, then through the valves in the rear axle area into tubes in the rockers. From there, the heated air passes through flex tubes to the mixing boxes under the windshield. You only have to get air from the back to the front.
As Widebody said, you don't have to re-invent the wheel.
Les

[Rot 911]

But, if you wanted to reinvent the wheel, you could make a new plenium for the fresh air blower, sucking in outside air, connect to the heat channel through the passenger side rocker panel, through your home made heat exchanger and then back through the heat channel through the driver's side rocker panel.

[jpnovak]

The simplest solution is to back-date the heater system and then run the ducts straight from the exits on the firewall to the defrost ducts. This will bypass the fresh-air system. I personally left the entire system in-place. It does not weigh much and I like fresh air and defrost.