|My Home Made Engine Pre-Heater|
The photos below show how a poor man makes an engine pre-heater.
First you use your torpedo heater and propane tank.
Next you go to your local Home Depot store and get the following duct reducers.
One 8 x 6 reducer. One 6 x 4 reducer. One 4 x 3 reducer. One 6" coupling. One 4" coupling.
The next thing is to fasten it all together with pop rivets and you wind up with what
you see in the photo below.
While you are at Home Depot, pick up a piece of 3" aluminum vent pipe like you see below. This pipe will streatch out to
The next thing is to put some legs on the device so it sits about one inch higher
than the mouth of the torpedo heater. The small end of the device where the flex hose attaches should
angle upwards from the rear. I made my legs out of 1/8" x 3/4" aluminum flat bar and pop riveted them
to the device. Attach the 3" flex aluminum hose to the front of the device with a worm gear clamp.
The entire device is freestanding from the torpedo heater. DO NOT attach the device direct to the torpedo
heater. If you do, flames will pass completely out of the end of the 3" aluminum hose. Don't ask me how I know this.
With the device freestanding, you simply set it about 10 inches from the heater and attach the end of the 3" aluminum hose to an opening
in the bottom of your cowl. The farther away from the heater you place the device, the cooler the air going into the cowl.
And naturally, the closer the hotter the air. At first I thought I would need a fan in the device so I bought a 4" duct
fan but it turned out that it was not needed at all as the torpedo heater forces plenty of air through the pipe into
Like I said, this is a poor man's pre-heater and the total cost of the parts was $26.76. Of course, that
price does not include the torpedo heater or the LP tank. Most folks who live in cold climates already
have a torpedo heater or some other type heater that this device could be adapted to.