I don’t understand how Long EZ pilots keep temps down while idling. There is very little air flow for cooling before take off. A few have used exhaust augmentation and it seems like the solution.
Mine consists of an aluminum heat barrier around the exhaust pipe. It is 20 inch wide flashing rolled into a cylinder and riveted. Foam spacers keep the pipe concentric. What diameter? Double the diameter of the pipe seems right. That makes it slightly larger than the intake diameter, which is ram air. These cylinders get glassed to the lower cowl and spacers removed. Lastly I will glass over the aluminum and fare it into the lower cowling. Theoretically, the main opening should now be sealed off! I’m going to have to experiment with that.
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