There are stories on the web of people who made this work very well for a year or two. People who appeared to really know what they were doing, and going to a lot of trouble to go about things the right way.
But eventually they suffered engine trouble, and any savings on fuel were then spent of rebuilding the car!
This is why I personally decided not to go down this route. If I had an old clunker, and a source of very cheap engines whioch I could fitr myself, then I might reconsider...
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