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Old 03-06-2006, 09:02 PM
Warrant's Avatar
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Extreme Energy vs VooDoo cams

Still trying to find the best cam for my needs. The engine is a chevy 400, 5.7 rods, Compression will be 9.5:1 with a th350 around 2500 stall and 3.42 or 3.73 rear gear. Car(72 nova) will be drivin pretty much everyday on just the local roads with very little freeway use. Heads will be 202 170cc or 200cc with weiand 8004 action+ intake with a Q-jet.

Im looking for somthing thatll give me a big nasty killer idle, but not be unstreetable or just absoulutly kill the low end, its goota sound mean!(yes yes yes i knw ur not suppose to select a cam for the sound, but i think the 400 cubes will make up for it

The cams Im debating against now is
comps XE274H (advdur-274/286 lift-.487/.490 dur@.050-230/236) or
Lunatis Voodoo 276(advdur-276/284 lift-.504/.525 dur@.050-233/241)

I think I will get the VooDoo becouse of the longer durations(hopefully giving more choopy idle) and becouse DeskTop Dyno doesnt show much of a difference(if i can trust DD)...400ftlbs@2000RPM i think is good for a tight converter?

Would the VooDoo be good? Any other cam suggestions? Or what ur cam sounds like in a 400?

Thanks

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Last edited by Warrant; 03-07-2006 at 08:14 PM.
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Old 03-06-2006, 09:31 PM
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umm, I think you have that backwards; voodoo cams have shorter durations so that they have more vacuum, so you also won't get that racey rough idle.
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Old 03-06-2006, 09:34 PM
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xe274h: http://www.compcams.com/Technical/Se...umber=12-246-3

voodoo276:http://www.holley.com/60104.asp

?
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Old 03-07-2006, 08:17 PM
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anyone? voodoo to big?
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Old 03-07-2006, 09:08 PM
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Id go with something like over 240 @ 050 because i have the 234/246 @ 050 comp cam and it not like what u want at all. I have a 383. Is easy to drive on the street. Id also say go solid for more what ur looking for.
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Old 03-07-2006, 09:14 PM
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Oh boy, here we go.

Subtract the duration @0.050" lift from the total duration for each camshaft. Call the resulting number Lobe Intensity, or L.I.

Lower L.I. numbers will result in a larger window of lobe overlap within a given lift range, assuming identical lobe separation angles for each camshaft.

More overlap within a given lift range = less vacuum, it sounds mean as hell. That overlap will also tend to raise the operating range of a camshaft. More on that later.

Short total duration usually means you'll have higher low speed cylinder pressure than a camshaft with more total duration. The valve closes sooner so the mixture gets squeezed a little more. Dynamic compression is what this is called.

The increased window of lobe overlap, with modern lobe designs, lessens the effect that short total duration has. A little bit of cylinder pressure gets "lost" during the increased window of lobe overlap.

"Lost" excess cylinder pressure happens through intake reversion at low speeds (low vacuum/mean sound) or a higher degree of cylinder scavenging from the exhaust at higher engine speeds. A clean cool mixture makes more power, most of the time. Overlap is a good thing in moderation and when it is balanced with other particulars of the engine.

The modern lobe designs used in these cams tend to increase cylinder pressure though the entire rpm range. Better Dynamic Compression, better high speed cylinder filling within the same duration window, and usually incorporate a higher maximum lift that benefits cylinder pressure at all engine speeds(if the heads are good enough to use it).

There's a lot more to this subject but I ain't got time to write a novel, other folks a lot smarter than me already have. I read them.

The reason for typing all this?

The Lunati VooDoo cam will have about the same amount of vacuum as a comparable Competition Cams Extreme Energy cam. It will sound mean as hell. It also might, I say might, make a little bit more power overall. Even if it does, you'll probably never feel it.


Larry

PS,

Here a clip of a 406" SBC with an XE284 cam idling. It ran like a raped ape with 3.73 gears and a 2800rpm converter.

http://www.geocities.com/gearjammer_72/Newmufflers.wav

Last edited by coldknock; 03-07-2006 at 09:30 PM. Reason: Added a link.
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Old 03-07-2006, 09:27 PM
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WOW! Thanks a ton for taking ur time to write all that. I apreciate it, i read that stuff in book and read more and more of it and it gets a little confusing. Again thanks to every1 for replying. Sounds like Ill take the VooDoo itll make good power it looks like and sound mean

Ha. ok another Q.... In the mean time while the 400 is being built, Would this(Voodoo) cam be too big for a 350 with stock 882 heads? (good intake and exhuast)

Thanks!
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Old 03-07-2006, 09:35 PM
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Honestly, the two cams you're looking at are better suited for a hot 350 or a mild 400. 50 cubic inches makes a different animal, where cam choices are concerned.

Have a listen to the link I added in the long post.


Larry
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Old 03-08-2006, 10:37 AM
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Quote:
Lower L.I. numbers will result in a larger window of lobe overlap within a given lift range, assuming identical lobe separation angles for each camshaft.
Let's make sure the totol duration no. are measured in the same place with every cam you choose to compare. Comps are measured at .006 tappet rise. I don't know where the other is measured.
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Old 03-08-2006, 02:50 PM
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Yea I think lunati is measured at somthing like either .004 or .008...but coudnt i just use the @.050 figures?
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Old 03-08-2006, 03:02 PM
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I would go with the Voodoo cam because it does infact have more duration- I would also ask them to narrow the LSA another 4 degrees. It''l give you killer midrange and a lopey idle. LSA has a huge effect on idle charecteristics and I think is too often forgotten about when slecting a camshaft.
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