Comp XFI Lobes
Staging Lane
Joined: Oct 2004
Posts: 70
Likes: 0
From: AUSTIN, TEXAS
Originally Posted by 1989GTA
Looks like the XFI is the mystery lobe. Not many are using them yet that they "know about". Maybe they are in some of the custom cams. Not much real world information.
Not sure why the more knowledgeable ones here on the forum have not chimed in yet. Possibly it is very new a are not sure about the XFI. My concern is it probably has a very flat nose, and Newton’s first law of motion is going to be one of the concerns.
TECH Apprentice
Joined: Jul 2005
Posts: 374
Likes: 0
Originally Posted by M2SPEED
That's a very interesting choice. I for one am very interested in the cam doctor. What did you have the LSA at?
I've used one on a customers z06, the 242 at .050 exhaust lobe to be exact, but we never had a chance to dyno and now he has a charger setup and blower cam in it. It did feel strong to me though and pulled all the way to 6850 with no float judging by my sotp. We did have 921 springs in this setup shimmed up quite a bit for some big pressure in comparison with most 1.29" o.d. springs for hydraulics.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Interesting that you were able to pull to 6850rpm with no valve float. That is good news as Comp list it to 6200rpm. I will be installing the 218XFI in my 3rd gen build up but will not have any info until late summer. 
Originally Posted by 1989GTA
Interesting that you were able to pull to 6850rpm with no valve float. That is good news as Comp list it to 6200rpm. I will be installing the 218XFI in my 3rd gen build up but will not have any info until late summer.
XTREME ENERGY™ XFI™ HYDRAULICS
The Xtreme Energy™ XFI™ Series is designed for use with modern induction systems, heads, springs and rockers. The XFI™ intake lobes have more
lift than the base Xtreme series, and the XFI™ exhaust lobes have more area under the curve, for better exhaust flow, than the base exhaust series.
These are the first hydraulic flat tappet profiles designed for use with COMP Cams’ Beehive Ovate valve springs such as the #26915, #26918 &
#26120. The combination of these profiles, the new springs, and our very stiff Pro Magnum™ rocker arms in higher ratios, makes for the most revolutionary
improvement in hydraulic flat tappet design to date by bringing the latest race winning technology to the street.
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Just reading the rpm range on their brochure. The XFI 242/248 rpm operating range is listed as 2200 to 6200. The 6200rpm seems a little low for such a big cam. I think you have proved otherwise with a good setup.
Staging Lane
Joined: Oct 2004
Posts: 70
Likes: 0
From: AUSTIN, TEXAS
Originally Posted by DAPSUPRSLO
XTREME ENERGY™ XFI™ HYDRAULICS
The Xtreme Energy™ XFI™ Series is designed for use with modern induction systems, heads, springs and rockers. The XFI™ intake lobes have more
lift than the base Xtreme series, and the XFI™ exhaust lobes have more area under the curve, for better exhaust flow, than the base exhaust series.
These are the first hydraulic flat tappet profiles designed for use with COMP Cams’ Beehive Ovate valve springs such as the #26915, #26918 &
#26120. The combination of these profiles, the new springs, and our very stiff Pro Magnum™ rocker arms in higher ratios, makes for the most revolutionary
improvement in hydraulic flat tappet design to date by bringing the latest race winning technology to the street.
The Xtreme Energy™ XFI™ Series is designed for use with modern induction systems, heads, springs and rockers. The XFI™ intake lobes have more
lift than the base Xtreme series, and the XFI™ exhaust lobes have more area under the curve, for better exhaust flow, than the base exhaust series.
These are the first hydraulic flat tappet profiles designed for use with COMP Cams’ Beehive Ovate valve springs such as the #26915, #26918 &
#26120. The combination of these profiles, the new springs, and our very stiff Pro Magnum™ rocker arms in higher ratios, makes for the most revolutionary
improvement in hydraulic flat tappet design to date by bringing the latest race winning technology to the street.
Originally Posted by M2SPEED
I noticed that in Comp Cams lobe catalog the mention of “hydraulic flat” tappet design, but the area in the catalog and the main description states “hydraulic roller”. Is what they’re saying is that the XFI was originally designed as a hydraulic flat tappet lobe but it’s now redesigned as hydraulic roller tappet lobe?
1989 GTA, wow, that is not much rpms for a cam of that size, interesting. Who knows what their reasons is for that. Comp does some funny things some time. The comp r lifters acceptability range of .002" pre-load is my favorite example, ha
Last edited by DAPSUPRSLO; Jun 1, 2006 at 07:04 AM.
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Originally Posted by M2SPEED
Not sure why the more knowledgeable ones here on the forum have not chimed in yet. Possibly it is very new a are not sure about the XFI. My concern is it probably has a very flat nose, and Newton’s first law of motion is going to be one of the concerns.
Good to see someone else here has some idea about all of this.
Bret
