Possible source of XFi Camshafts!

[Coyote X]

I just got this comment on my website:

Hi I just wanted everyone know that Delta Camshaft in Tacoma, Wa 253-572-2474 can regrind your stock base or non xfi can to Exact XFI cam specs for around $50.00. I gained 8 mpg with it. Thanks James

I can't guarantee that place does a good job but I will probably be sending one of my extra camshafts there to be done in the next few weeks

[SVOboy]

That's one hell of a sweet deal, Let us know about your results.

[Daox]

Wow, thats the cheapest regrind I've heard of. Is the Metro engine a 2 valves per cylinder engine? That would limit their work. Most places I've seen charge $100 per cam shaft, but thats on a 4 valve per cylinder engine.

[Coyote X]

I figure someone else on here would prob beat me to getting a cam sent to them since a base metro cam is so easy to get.

What would be nice is if they could grind it so the power range is even lower than the xfi cam and push the peak power to around 1900rpm. With 14 inch tires and 3.52 gearing that would be an incredible combination

http://deltacam.com/camshaftgrinding.php is their website it looks like

[MetroMPG]

Coyote, relative to the stock engine, do you have any info (or a best guess) on where the peak torque is for an XFi relative to the garden variety 1.0?



That's the BSFC map for the garden variety motor, going by the power rating.

The torque curve with the XFi cam is obviously lower (based on the butt-o-meter) after doing the swap in my car. If I knew how much lower, I'd be able to fine tune my pulse & glide technique.

[Coyote X]

2 valves per cylinder so it is only 6 lobes they have to grind

I might send them a cam or two after school is out just so the people that don't have time to get their only cam sent in will have a way to get one in their car. I could send them my cam they can swap it into their car and send theirs in to get ground and just have it shipped to me.

If they do good work and everyone starts hearing about them I bet they start wondering where all these metro camshafts are coming from

[Coyote X]

Here is everything I have found so far on the metro cams from Teamswift:

Horsepower @ RPM: 49 @ 4,700 (XFi)
Horsepower @ RPM: 55 @ 5,700 (Base and LSi)
Torque(lb/ft) @ RPM: 58 @ 3,300 (All Models)

stock profiles are

Lift/Duration at .050"

85-87 1.0/3cyl 330 /192
89-01 1.0/3cyl 330 /198
GT I 295/192 E295 /198
Cultus I 305/192 E305/198
1.3 8V 330/192
1.3 16V SOHC 308/184
1.6 8V 356/202
1.6 16V I 308/192 E308/198

I don't have the lift/duration for the xfi cam, I never have had time to take a degree wheel and dial indicator out and measure it. Advancing the cam 3-4 degrees increased the bottom end power even more and totally killed top end so I still think the cam can go a bit smaller than xfi spec and pick up even more mileage. But considering the 5mpg or better improvement the xfi spec cam gives It might not be that much more of a gain to go even lower. Might not be worth having nothing left over 2500 just for another 2mpg on top of the xfi spec.

What am I thinking this is EM everyone would be perfectly happy with a 2500rpm limit for .5mpg even

[MetroMPG]

Originally Posted by Coyote X

I don't have the lift/duration for the xfi cam

Here's what I have:

The differences in numbers (from a 1994 service manual, for those who like the nitty-gritty):

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).

And - according to the resident cam guru (superf1y) at teamswift.net, the XFi cam is "6 degrees advanced from the stock cam, based on measurements of intake centerline."

http://metrompg.com/posts/xfi-cam-swap.htm

[AndrewJ]

very exciting news.

Pardon my ignorance, but what are the differences between the XFi and the "garden variety"?

To convert a garden variety 1.0L metro to an XFi you'd need a cam, the taller tranny, and is that all?

[Economic Al]

Well, this answers my question (in my head) *no pun intended* about having a stock metro camshaft ground to XFi specs!

A few other things I'm wondering about:

- If one has a '96 or newer OBD II model, could said car's PCM (computer) be troubled at all by the fact that there's now a new camshaft profile?

-If you have to retard the timing a bit to compensate for pinging due to the advanced cam grind, it seems possible that this might cause the computer to throw a trouble code?

Anyone have any thoughts or experiences pertaining to this?

Al