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Old 05-25-2002, 03:38 PM   #1
Unit 5302
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Join Date: May 1999
Posts: 5,246
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Quote:
Originally posted by Mach 1


Sounds like a decent cam for your run of the mill , street EFI 5.0, from mildly to moderately modified.

I still cant understand why you hate these cams so much. Why would they try to "compensate" for poor duration with valve lift? Why wouldnt they just give the cam more duration and less lift if that were to get them the same results? Maybe they like that particular group of cams to have mid duration, high lift because they work good in 5.0s with roller cams? Maybe, just maybe....
Duration and overlap mean more to higher rpm peroformance than lift does. If you look at Comp Cams XE slogan it's "more power than other cams with the same duration." That is true. The cams you would have to compare the XE series to are much milder in lift. The XE series eliminates a good few head combos from the ability to pick and choose, and the ones that they don't eliminate are generally more aggressive than the cam profile is.

The XE series on the basis of looking purely at the cam itself isn't as bad as I make it out to be. On the majority of heads available for the 5.0, it requires a lot of additional money to be invested, though. If the head is designed for a very high lift cam, most likely it's going to be a very aggressive head, and the XE series are not aggressive high rpm camshafts.

If you're willing to spend the money to put a valvetrain capable of using the XE series camshafts on a mild to midline 5.0 combination, the XE series should perform well. You could get the same performance for a lot less money if you were to go with a different cam with a little more duration and a drop in lift so the heads spring combination will work with the camshaft. All in all, I feel the XE camshaft line is kinda gimmicky. While they should work, there can be some hidden charges, and they shouldn't perform any better than the rest of the cams they go up against. I also see them as being quite inefficient in the way the go about making their power.

Lately the people I've seen asking about the XE cams are E7 and GT40P users. For them, the XE cam isn't gonna do much good. If the GT40P heads were stage 1, 2, or 3 job, then the XE cam would probably work with it because those heads usually come with better springs along with the porting work.

mysweetlx I am not, nor do I claim to be a camshaft guru. The real cam guru's are out there installing cams, testing them, and building them. All I'm doing is shooting a little theory your way. You can do a lot of research on the internet to learn about different aspects of how engines work. Just have to be careful as a good portion of the net has some "shady" articles.
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