[ A full report of this thread appears here:
http://metrompg.com/posts/xfi-cam-swap.htm ]
Thanks to a certain website overlord who shall remain nameless, I now have in my posession a camshaft from a Metro XFi (year and mileage unknown).
This cam will find its way into the Blackfly's engine compartment in the not too distant future, replacing the extravagantly wasteful OEM cam that came with the car.
Metro aficionados know that the XFi cam was one of several mechanical differences between that model and the garden-variety Metros, which cumulatively gave it a significantly better EPA rating:
Quote:
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In 1994, the XFi was rated at 53/58 US mpg city/hwy - that's an astounding 15%/18% better than a regular '94 3-cylinder, 5-speed Metro (46/49 mpg) . - MetroMPG.com
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How much of a difference the cam will make by itself is anyone's guess.
I'd really like to do some A-B-A to get an actual number, but cam swaps at the side of the road on a hot engine may be problematic. Besides, the return of testing season is 3 months away at best. So I'm just going to install it and revisit the experiment question later.