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Old 11-28-2007, 02:32 PM   #4 (permalink)
MetroMPG
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Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 21,218

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

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Quote:
The following is from my 1994 metro service manual:

XFI Model
Standard camshaft lobe height is 39.628 to 39.788 mm
(1.5602 to 1.5665 inches).
Wear limit 39.528 (1.5562 inches).

Base and LSI Models
Standard camshaft lobe height is 40.415 to 40.575 mm
(1.5911 to 1.5974 inches).
Wear limit 40.315 mm (1.5872 inches).
Here's some more info about the XFi cam from the member who makes the "economy grind" cams:

Quote:
You don't want to advance that xfi cam anymore than about 4 degress. They are ground on a different centerline, and coupled with the shorter duration, you might have problem with high dynamic compression, and loss of midrange power.
What that tells me is that in addition to shorter lift & duration, the XFi cam timing is advanced compared to stock.
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