The car I’m working on will eventually retire to a leisurely life in Washington -a state well known for its rainfall. As such, I decided a good forced air system to heat the cabin and defog the windscreen was a good idea. I have the original fan impeller mounted on a modern motor in my Sprint and it works okay -you can feel a little moving air, but it’s not very impressive (admittedly most of my ducting is leaky original BS or ill-fitting replacement BS, so maybe an unfair test). Anyway, I was perusing the McMaster catalog when I found a 4″, 12 volt all-in-one in-line blower fan.
Applications: Sprint and sprint Veloce.
Failure mode: electric motor failure.
Current state of parts: repair original or find something to adapt in place of the original.
This is where the Air intake plenum lives. It’s designed to act as a ram-air and I imagine at over about 40 mph the air forced in is moving faster than the original fan could push it in. The rest under here looks pretty nice…
Here’s the unit after it came back from the powdercoat shop. The fan, motor, mount, rubber buffers for the integral mount strap and pins are all original items pulled from this plenum. A big thanks to Glenn for keeping this part in storage for all those years then selling it to me!
It’s not a Pebble Beach resto, so I’ll not be attempting to rebuild this original IPRA electric motor for this car -maybe later though as an exercise in curiosity abatement. I was looking for a replacement motor like the one in my car from McMaster-Carr (~$100) and stumbled upon another (and cheaper) approach.
This inline blower was $66 (I think) and seemed worth trying out.
I suppose I could have mounted this without the original plenum, but decided to cut the mounts off and mount it inside the original plenum. No going back now! Note the motor even has a nice rubber water resistant cover. Light weight too!
Look at that -it just wedged in there perfectly.
I decided this length of old vacuum line would make a nice seal between the new motor and old plenum and help reduce vibration.
Looks deceptively like this mounting screw will hit the fan blade, but it doesn’t. One screw has this assembly very solid.
It blows pretty hard! With all new ducts and the heater box I built I think a lot of air will get pushed. I’m going to try and use the original fan speed rheostat, but may have to try and find something in the catalog that will fit. I don’t think this fan will be desirable as a one speed.
Motor specs and part number if you’re interested.
Up next? Whatever I decide to do I guess…