I've since built and flown two FAA-certified aircraft that were powered by VW engines. Reliable as a stone axe, those engines.
I actually agree in spite of the fact that the only aircraft i ever bent was powered by a VW. The thing was a Revmaster conversion with a single (yes that is correct) Scintilla magneto.
The engine was fitted to a Corby Starlet that was beautifully built over 10 years by a guy who demanded perfection of himself when it came to woodwork. turned out he didn't like flying much, in fact in the time I knew him he never achieved the removal of the area restriction from his licence. But he did like seeing his plane flown and I, as an hour hungry private pilot working towards a commercial licence, was more than happy to oblige.
I was responsible for some modifications as when it was first built the aircraft had only a basic UHF radio run by a total loss motorcycle battery. The rules changes and flights in controlled airspace required an SSR transponder. as the aircraft was based in a major regional city that was a shared civil/military airbase, non-compliance was not an option. I adapted a small "universal" motor (previously powering a sewing machine) into a generator and mounted it in the spot that once held a distributor.
I also bought (but foolishly never fitted) a hall effect conventional ignition system. The heads were fitted for duel plugs but in view of the single standard magneto the lower plug holes were plugged. I intended to mount a plate behind the prop to trigger the hall effect, but, as I said, never got around to it.
I have always said that the presence of two magnetos on certified engines is a statement of faith in their product by magneto manufacturers.
Sure enough, the blasted thing failed on me causing an untidy arrival in a farmer's field. The soft soil damaged the U/C somewhat and the cane stalks wreaked havoc on the fabric covering but otherwise no real harm - aside of course from the medical procedure to remove the seat cushion from between my butt cheeks.
The owner was very understanding, especially seeing as extended testing of the magneto could not identify a fault (I resolved to never fly behind that magneto again, but in any event it was moot, the owner repaired the plane and then hung it over his bar. He died some years later and i made a token effort to buy the plane but the wife had a very unrealistic price in mind and that was that.