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Oil Filler Tube
The factory placed the oil filler tube in the top of the accessory top cover. If you are building a "Blower Fan" engine, this filler tub may need to be rewelded so that it misses the intake manifold.
If you are building an engine without a blower fan, then you have two choices:
1. Shorten the oil filler tube and reweld it (watch that it does not run into the fuel pump).
2. Get a top cover from a Corvair van or pickup truck.
These top covers do not have an oil filler tube already installed in them. With one of these you can put a filler neck in at the position you require.
Dipstick
If you are building an engine without the blower fan, then you will have to cut 5" off of the dipstick tube and dipstick. This will make it fit tightly underneath the cowl.
Ignition System
The only ignition system that I recommend is the stock points ignition. The reasons are simple. When points ignition dies, it usually dies slowly over a period of many hours. When electronic ignition dies, it usually just quits without warning. It does not matter that the electronic ignition will last longer or is less likely to fail; how it fails is everything.
The Corvair engine must have the proper amount of ignition advance to perform. It is ridiculous to expect the Corvair engine to produce power with limited ignition advance. The difference between 25 degrees and 34 degrees can be 30hp. I spoke with a man who installed a Corvair engine in his airplane and later removed it, complaining of lack of power. When I asked him about ignition, he stated he used 24 degrees total advance because "that's what Continentals use." My testing and experience with Pietenpols tell me he could have added 400 feet per minute to his rate of climb by turning the distributor 10 degrees.
Many people ask about dual ignition. I don't see any need for it. If you wish to duplicate parts, remember that the number one enemy is heat. Duplicate the parts which are sensitive to temperature, i.e. the coil and the ballast resister. The automatic coil switch which allows using two coils is an MSD part no. 8210. I have flown many hours with a magneto backup and never used it. My airplane no longer has it.
With any ignition system you must use quality parts. Here is a list of the parts I used on my engine's ignition system: . . .
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