Blackfly XFi? Cam swap! Update: swap completed

[MetroMPG]

OK, smartypants... if a cam swap can improve efficiency, why don't all Metros have this kind of cam?

Because the cam profile is not good for top end performance. Lowers the redline (valves are more prone to floating than with the stock cam).

Remember the XFi also has a taller than regular final drive, so its cam profile goes better with that.

[MetroMPG]

Cam update (originally written March 14/07)

Have I mentioned yet how much I like what this has done to the character of the engine? I really like it. It's so much more suited to my driving style.

I would recommend this mod to any Metro owner, particularly in combination with the longer legs. If I had the chance to buy an XFi over a regular Metro, I'd do it just for the difference in the way (I imagine) it drives.

I'm starting to realize I'd probably also really like driving a manual shift diesel for the same reasons - low end torque, short shifting, quiet, laid back, un-fussy.

[MetroMPG]

For anyone following this thread, I've updated MetroMPG.com with a post summarizing the issues, installation, and (predominantly subjective) results of installing the cam in my car. Most of what you've read here is included, with some new bits added:

International heart transplant: the Blackfly gets an XFi cam - MetroMPG.com

[MetroMPG]

For those wanting another Metro owner's perspective on the cam swap, Frederick has a thread about his car: Another Metro to get taller final drive & XFi cam

[GenKreton]

Pretty cool thread you resurrected here! I never realized swapping a cam could resulting in any significant improvements.

[Katmandu]

What is the Lift/Duration (@.050" - Not Advertised #) for the XFi Camshaft ?

[Frederick]

I have been driving Espresso for a few months.
It has the XFi cam and a taller gear, actually TALLER than a regular XFi. I got it from a 4 cyl, SOHC.

When asked by members of The Order Of Canada yesterday which car did I prefer: Vanilla Latte with a stock turbo swap or Espresso Nero. I could not lie, even though my lips were stained cherry red:
The XfI cammed one. Sirs.

Yes, Espresso Nero, is a joy to ride. Particularly when passing.................... gas stations.

[kimer6]

I just installed the XFI regrind in my latest 92 Metro convertible. Stock gear ratio, 13" tires at 32psi, 8 degree cam advance, Mobile 1 synthetic ATF in my transaxle, seat of the pants ignition advance. With the top up and windows closed I used .78 gallons of fuel in 41.6 miles for 53.3 miles per gallon. I filled the gas right to the filler neck 1/2 inch above the flapper and shook the car to get any air out and repeated the procedure at the end of the trip. Top speed was 65mph for short periods and there were a few traffic lights before getting on the highways. Average speed was 60.

My previous best on the same trip was 44mpg stock with 90w gear oil in the trans. Only a long term average will show accurate results. But I am certain that I am using far less throttle opening and it has more torque at lower rpm. I will be trying Singh grooves in the head as soon as my gaskets and head bolts arrive. I like the feel of the XFI cam and really appreciate the fuel economy boost while I keep my same driving habits.