Bob schreef:
I think the topic (40hp engine) is of sufficient interest
internationally to justify some form of permanent address on the
internet. The problem is only going to become worse.

Well here goes for what it's worth: a certain Mr. Doutard from France
fitted a reduction to the 2-cylinder Citroen Visa car engine.
Unfortunately he passed away some 6 year ago and I could no trace of a
follow-up. The idea seems excellent though. Actually there is one such
engine in my car right now but of course it is not on offer.

The guy in France from whom I got it had heard rumours of some Italian
doing much the same thing, with the extra addition of a turbo-charger.
That seems a bit weird on a 2-cylinder boxer... Who knows more?