Re: Has anybody here used the comp cam xtreme energy cams?
[Re: 1970Moparmann]
#627658
06/19/10 06:01 PM
06/19/10 06:01 PM
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Joined: Mar 2005
Posts: 1,630 North Central Florida
eightlitermopar
top fuel
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top fuel
Joined: Mar 2005
Posts: 1,630
North Central Florida
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I have a comp XE262 cam in my 383. It is a tad on the conservative side, will be going up to the XE268 (which I have already laying around).
I like the cams, a little flat down low for my heavy 71 B body, but I do like the driveability.
I would recommed them!
eight
Mopar or no car
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: eightlitermopar]
#627659
06/19/10 06:53 PM
06/19/10 06:53 PM
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Joined: Jan 2003
Posts: 1,481 Outside
thedriver
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,481
Outside
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use a 285Hl in my 340, pulls hard to 6800, generally shift 6500. idles at 850 with a 750 mighty demon. in a 340 the 285HL is about as big as i'd go with a street cam. makes way more power than my old xe268 cam.
1973 challenger Dana. 4 speed. Low deck.
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: thedriver]
#627660
06/19/10 07:38 PM
06/19/10 07:38 PM
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Joined: Dec 2009
Posts: 1,074 detroit, mi
POS Dakota
super stock
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super stock
Joined: Dec 2009
Posts: 1,074
detroit, mi
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The good ones are the roller versions. Not to stir the pot any, but given all the flat tappet cam failures we hear of on here (and they are A LOT) it boggles the mind why people even bother... And this is not to say I am any better. I've wiped them too. I'll NEVER use a flat tappet cam again. Yeah it's expensive to go roller, but chances of having any kind of problem are extremely slim. To me that makes it worth the extra coin. Just my thought on it.
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: 1970Moparmann]
#627664
06/20/10 10:15 AM
06/20/10 10:15 AM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Like anything else, there's consrvative people and not so conservative. The less conservative one is, the more "perfect" everything else has to be. That means as the rate of lift rises with the mopar design, things like spring pressures, rocker geometry, oil clearances, lifter bore size and angle, lifter rotation... All those things get much more imperative to get right to have no issues. The XE line is a great line of cams. They will be noisey from about the XE268H up. If you want quiet get an older grind and they'll be quiet. I loved Crane for that reason. Biggest killer of these cams is lack of rotation (lifter boores too loose or not angles properly) and too weak a spring (Edelbrocks are just adequate for many of these cams. You can't use ".600 lift" as a spec and think all's hunky dory.)
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: James74]
#627667
06/22/10 08:01 AM
06/22/10 08:01 AM
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Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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x2 on the step up to roller I read enuff on here about flat lobes I wont use comp cams as they are the ones I have read to much about going flat I have 3 used rollers now and have swaped all of them at least 2x and not a problem yet now if I could just make up my mind on which one I want to keep in there my worthless
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: GregCon]
#627669
06/22/10 11:36 AM
06/22/10 11:36 AM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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They are noisey because not all hydraulics are the same. Factory type cams and lifters are quiet. Most older cam gerinds (until they get fairly large) are also quiet because they use stock type lifters. But when the rate of lift goes up (ala Comp's XE line, lunati's VooDoo, some Engle lobe designs, etc) the lifter has to be made differently to handle the spring pressures those fast ramp profiles need. If the lifter preload is perfect, usually they are only slightly noisey. Quieter than a solid flat tappet. If the repload is not perfect, there's not a problem, but they get noisey. Add adjustable rockers and the thin aluminum valve covers and they get rather loud. I like the sound but some guys don't or don't know it's normal.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: GwaiiEagle]
#627671
06/22/10 06:03 PM
06/22/10 06:03 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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The XE "HL" cams are the .904 lifter. The others are based on the .842 lifter's maximum rate of lift. least that's how I understand it.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Has anybody here used the comp cam xtreme energy ca
[Re: ]
#627672
06/22/10 06:53 PM
06/22/10 06:53 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... On the dyno they do crazy stuff--One RPM great --next level RPM goes weird...
Yeah, I've seen examples of that, too. IMO, they're too aggressive for hydraulic lobes and cause valve train instabilities at high RPM. Hydraulic cams really benefit from having smooth lobes, even if they don't squeeze out all the potential lift possible.
When the XE cams first came out, a Chevy-only magazine did a buildup w/ one and the valve train "crash" above about 5500 RPM was obvious. They actually swapped the XE cam for one of the "old style" Comp hydraulic grinds and the engine picked up across the curve and gained 500+ RPM before things got noticeably unstable.
I'm surprised Comp didn't threaten to pull their advertising, considering how poorly that article made the "new and improved" XE cam look.
All that extra noise should tell you something.
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Re: Has anybody here used the comp cam xtreme energy cams?
[Re: GregCon]
#627674
06/22/10 09:51 PM
06/22/10 09:51 PM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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What does the noise tell you Cap'n? I agree that if you use the wrong spring they will cause problems. But so wil any cam using not enough spring. So MP cams with .028 lash are quiet? Large cams in the 80s with Rhodes lifters were quiet?
We use them because of the power, or more importantly the better range of power, such designs yield. I have a few customers who want things silent. But for most of the people who are running headers and open element air cleaners a little valvetrain noise is just more music. These are not sounding like a 6 vylinder that never had the rockers adjusted in 50 years. They have a slight tick I'd equate to the sound an exh pulse in the header primary has on some cars. It's not bad unless you ignore things like proper pushrod length and preload.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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