Added heat to my header'd -4 Options

[geniusanthony]

So this weekend I did a lot of tinkering to put my curiosity to bed on heating a car with headers. I remember reading from Dan Root's -6 conversion thread that he welded some pipe to his headers and pushed air through with a stock heater fan.

Sorry no pics now but, I can explain somewhat. I tacked a bent pipe in perhaps 20 places along the length of this bent pipe to the left hand primary tubes. I did insulate the header plus pipe in 1" header wrap. When I attached the blower and ran at idle for maybe 10 minutes I measured the duct surface temp at the driver footwell to be 87 deg. with a good supply of air flowing out. I do think that perhaps the dual oulet blower ( 1 side is capped) from an early car does blow a bit too hard and may need to throttle down that motor or perhaps replace with a bilge blower.

I do realize that this is not ideal and the C0_1 hazard but these are not permanent and I will inspect in the spring when defrost is no longer needed for corrosion etc..

Now, if I do replace the fan or throttle it down, more heat soak should occur between the heater pipe and the air traveling through. Additionally I have not road tested only idled so I anticipate more heat as I piddle around town regardless of cfm through the hose.

Does anyone have an idea about how much cfm the 71 dual oulet blower should blow?

[geniusanthony]

Rod, I didn't mean that the stock blower flowed 250 cfm, I just found that as a possible representation of what another manifold heater system uses.

I did get the feeling today that slowing the fan would allow more conduction of heat into the pipes and then into the airflow. Too much air...in my application cools the pipes off too much. I tried this by using various resistors in the power lines.

Unfortunately, I think the bushings in my fan motor have died rather epically... it went from a bit noisy to grinding to I unplugged it. I may end up having to get a bilge blower just to see what happens. It should allow cleaner routing.

RE: CFM of these air pumps. disregarding rpm of the elec. motor and making a whole bunch more assumptions. I can see a 4" blower specs at 230ish cfm, a 3" at 120, so our 2" blower based on just area pi*r^2

Hows this for some BS math

4 INCH, 12.56^2 230CFM

230/12= 18

3 INCH, 7.065^2 120CFM

18 * 7.065=128

2 INCH, 3.14^2

18 * 3.14=57

So I don't know what to make of this and they are diff. fans but take it for what it is. Please don' kill me for the quick math, I am just thinking out loud.