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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #11  
Old 08-30-2011, 04:47 PM
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Quote:
Originally Posted by snrusnak View Post
Can you post the specs on the cams? Some of us aren't familiar with these fancy names lol. May be able to give more input if you provide all the specs, and exactly what you want to do with it(I assume drag race/daily driver?)

268 duration is aggressive, but very streetable cam, makes me wonder what the duration on the one you have now is?
Here is a pic of my cam card. It has all the specs for the cam I am currently running. As far as what I am looking to do with my truck, I am trying to stay streetable but still be able to put down a good number at the track.

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  #12  
Old 08-30-2011, 04:53 PM
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None of those cams seem to have alot of duration....unless I'm reading something wrong? You posted a 268 but I don't see that anywhere. They have alot of lift, but I've found duration to be more important from my experience. I would recommend that you get a cam that has more lift/duration on the exhaust side than the intake, it will help build the rpm's quicker, it will keep the motor from choking up.
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Old 08-30-2011, 04:58 PM
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Quote:
Originally Posted by snrusnak View Post
None of those cams seem to have alot of duration....unless I'm reading something wrong? You posted a 268 but I don't see that anywhere. They have alot of lift, but I've found duration to be more important from my experience. I would recommend that you get a cam that has more lift/duration on the exhaust side than the intake, it will help build the rpm's quicker, it will keep the motor from choking up.
The 268 isn't made by the same company as the other cams we were talking about. The 268 is from comp.

Good info about the duration vs lift. I will have to keep that in mind.
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  #14  
Old 08-30-2011, 05:00 PM
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nm I didn't realize those durations were at .05 lift, thought that was advertised. The "hellfire" and the "sparrow" are pretty comparable, main difference being the sparrow has more lift, but I don't think you'd gain much from that. Those are pretty aggressive cams, would still be very streetable though. I think if you went much larger than that you'd start to approach too much for the street, but that's all up to you. The biggest issue is usually idle rpm. Once you start to get up around 1,000-1,200 rpm idle it gets to be a PITA.
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Old 08-30-2011, 05:02 PM
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Hellfire is based off the Comp 268 with the exception of the 115lsa.

Comp 268
http://www.compcams.com/Company/CC/c...?csid=605&sb=2
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Old 08-30-2011, 05:09 PM
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The lift becomes less important as it gets larger, I've seen some bench flow numbers and they usually look something like this:

0.1 lift: 25cfm
0.2 lift: 75cfm
0.3 lift: 150cfm
0.4 lift: 250cfm
0.5 lift: 275cfm
0.6 lift: 290cfm

I made these numbers up, but this is what I have seen from my experience. You can see the flow drops off and duration becomes more important. So if you can hold the valve open for more time at 0.5 lift it is more beneficial than having it open for less time but achieving 0.6 lift. The two sort of go hand in hand though, if you have more lift you usually have more duration. Also, more duration is slightly easier on the valvetrain, it allows for a slightly more gradual operation, although it's pretty much negligible...

I think those two cams are good choices for the street, you could go more but just depends if you will be annoyed by it. I personally would drive just about anything and wouldn't mind an overly aggressive cam, they all behave well once the vehicle is moving along. The biggest issue to me is the idle rpm like I said...
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  #17  
Old 08-30-2011, 05:13 PM
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Comp is a great company, I've never heard of the others. I'd bet a company like comp or crane has more R&D into their cams, and you'll get a little more out of them.
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  #18  
Old 08-30-2011, 05:14 PM
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Should hold idle just fine around with the Hellfire and custom tune.
The specs on my old 273 is considered a big cam for the 5.7L stock block but the lsa was retarded so much that i could hold idle just fine at 525rpm. I kept it at 725rpm in D though. Of course i had zero low end until 5k rpm.
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Old 08-30-2011, 05:20 PM
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^good point definitely have an advantage with computer controlled vehicles. I am used to carbed. I ran a 272 adv (I think it was around 215intake/220exhaust @ .05) and about .49 intake/.5 exhaust lift cam in my carbed ford and it wouldn't hold an idle under 1,000 rpm. If you can tune it to a good idle then go as aggressive as you'd like, just remember usually the more aggressive = higher rpm powerband and less mpg. You don't want a cam that doesn't have power until 3,000rpm when most of your driving is at 1,000-3,000rpm. Those cams you posted above should be good for power around 1,500-2,000 rpm and up I'd think.
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Old 08-30-2011, 05:20 PM
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273 for giggles and not a recommendation for ORT.
http://www.compcams.com/Company/CC/c...?csid=606&sb=2
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