FYI, in addition to lower lift & duration, the Metro XFi cam is also
reportedly advanced, compared to the non-XFi cam (this from the guy who does economy cam grinds):
Quote:
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"6 degrees advanced from the stock cam, based on measurements of intake centerline."
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Note the Metro is SOHC.
Everyone who has done the XFi cam swap, myself included, has reported improved low-end torque / driveability, which should contribute to reduced fuel consumption. Impossible to say how much of this is due to valve timing vs. the lift/duration changes.
Coyote X did an (admittedly not perfect)
cam retard/advance experiment and noted these results. He also re-adjusted his ignition advance to maximize it (without ping) after each cam adjustment.
