You can always go hunt down a Corvair core motor, scavenge the internet for information, tear down your core and find parts that you think will work for you. Put it all together according to the best information you can find for free — and then you can figure out some kind of firewall forward installation, hook it all up, do your taxi tests and recite your Ava Maria before taxiing for your first flight. You can figure it all out. You can take that risk. But you can also manage your risk better by learning from other people’s experiences. Which is a good idea when you’re putting your life on the line in your own homebuilt aircraft.
That’s what I’m doing. I’m taking advantage of other people’s experience. I already own this manual. I highly recommend it: