Is anyone going to try or heard anything about these new style cams?

http://www.jegs.com/cgi-bin/ncommerc...85&prmenbr=361

I'm going to test out the following in a few weeks:
Advertised Duration : 262°/268°
Duration @ .050 IN/EX : 219°/227°
Gross Valve lift IN/EX .468''/.489''
LSA and ICL 112/108
RPM Range: 1400-5800

355 engine combo: vortec heads - Z28 springs, 1.5 rr's, performer, road demon 625, 9.75cr, 1 5/8" long tubes, 2 1/2" chambered w/ H pipe, stock fuel pump, th350, 3.70 posi

 

I have heard of these cams and am definitely interested for use when I rebuild my 454. DD2000 seems to show good numbers when I run the specs through for my project. I think the cam designer is posting on Chevelle forum - he used to work for Comp Cams, now has designed Voodoo, etc... They are said to offer modern (read: steep) ramp angles and offer best performance for given duration. Be sure you use proper springs - not too light and not too stiff. Either can be bad news with aggressive ramps, so I have read...

I assume you are running the 350 in your '76? I would definitely like to read posts from folks who install these cams...

 

Exactly, that would suck to wipe a lobe due to unmatched components.
I called Lunati at 901-365-0950 - very helpful.

They said the Z28 springs are perfect for the voodoo line within the lift range.

Could you run my above combo though DD? Thanks!

 

The Voodoo line is the latest designs from Harold Brookshire, a legend in cam design. He wrote the first cam design computer program in the mid 70's. He pioneered split duration cams at comp cams in the late 70's. Several of those grinds are still being sold by comp today. Early 80's he started his own company, Ultradyne. A few years back he went to Lunati (owned by Holley) and the voodoo's are his first design for them.

So in short, yes, I think these cams will be better than anything else out there. Harold knows his stuff. Someone I know and trust at Holley did back-to-back dyno testing of the voodoos vs comp cams and every one of the voodoo cams made atleast 10-15 more hp than the comp cams counterpart.

 

I just noticed an ad about them. From what zwede is saying I think I may try one. I'm definitely not running another Comp Cams on this engine. I don't know who's fault it is but snapping the cam in half isn't cool. I'll have to talk to the Holley/Lunati guys and see what they have to say about them.

 

Burners: Go to this forum:

http://www.chevelles.com/cgi-bin/for...=0;DaysPrune=0

And do a search for posts by UDHAROLD. That's Harold Brookshires handle. He posts quite a lot and I promise you will learn many new things. As I said, this guy knows camshafts.

 

Was it, by any chance, a small base circle cam? Which cam was it?

 

[QUOTE=zwede]The Voodoo line is the latest designs from Harold Brookshire, a legend in cam design. He wrote the first cam design computer program in the mid 70's. He pioneered split duration cams at comp cams in the late 70's. Several of those grinds are still being sold by comp today. Early 80's he started his own company, Ultradyne. A few years back he went to Lunati (owned by Holley) and the voodoo's are his first design for them. QUOTE]

Hold on a second, GM used computer programs to design cams back in the '60's. Most notably, Pontiac used this technology to develop their '041' cam design that was first used as part of the RAII package for '68; and used again for the RAIV in '69 and '70. It was also a split duration cam and relatively large at 230/240 degrees duration @ 0.050" lift. Edelbrock validated (i.e. copied) this design some 20+ years later for their "Performer RPM" Pontiac cam.

I did like the Ultradyne solid rollers however, and used a 250/262 @ 0.050" lift version in a street '71 T/A that ran mid 11's.

 

That's what I get for typing too fast! Brookshire developed the first cam design computer program in the aftermarket. For the split design, he didn't invent it, but he introduced Comp Cams to the concept.

 

Iin case anybody wonders, here is Harold's lesson on split duration cams I copied a few years ago:
There are two different items at work here.
1.---On most cylinder heads, whenever I have around a 75% exhaust-to-intake ratio, I use an 8 degree bigger exhaust cam. If the ratio is under 70%, I use 12 degrees, and around 80%, only 4. Whenver the ratio gets around 85%, single pattern cams seem to work as good as anything. Rarely do reverse-pattern(intake bigger than exhaust) cams work. The two times they do, blown alcohol and turbo-charged, are both for putting heat into the engine or the exhaust.
2.---At the same time, it depends upon what you want the engine to do. Single pattern cams have better bottom-end, dual pattern cams have better top-end. At low RPM, the longer power stroke of a single pattern cam puts more torque into the crank. At high RPM, the most important thing is getting exhaust gas out of the engine. You can't get more charge in if old exhaust gas is still in the chamber. This is why the torque curve makes a sudden down-turn at peak horsepower. The exhaust cam has suddenly become inefficient about getting the old exhaust out, and some gas is retained and trapped, and the intake cannot fill completely because of this extra exhaust gas hanging around.
So, for the best overall power curve, on the average you want a dual-pattern cam, and around 8 to 10 degrees more exhaust. However, if a lot of bottom-end is your goal, or you have heads with a high exhaust/intake ratio, a single-pattern cam will work better.
Was this confusing enough? This is based on 30 years(1972-2002) of cam design and application...
Let me know if you have further questions...

UDHarold

 

Not only is Harold a cam guru but he's a great guy too. When he owned Ultradyne he'd spend as much time on the phone w/ me as needed just to make sure I had enough info. He'd usually go well beyond my knowledge of cams but I always learned something & he's got some great old racing stories. Lately he's been swamped at Lunati w/ cam dyno testing so I'm not sure how much time he'd have to spend on the phone. If you ever get the chance to pick his brain it'll be well worth your time.

 

Nice thread!

 

Harold with Voodoo, I like it, great thread!

 

I will be waiting for Car Craft or one of the other mags to test these VooDoo cams vs. Comp Cam's Xtreme Energy series... I believe VooDoo's advertisement is claiming 16hp more and 28ft lbs. more than a Comp Cam XE 268...

We'll see!

Bob

 

Hmmm maybe I will contact lunati for my turbo cam

 

I am pretty certain it was the guy that owned General Kinetics who pioneered dual pattern cams with plain jane symmetrical lobes . Some good stuff here n there through their line-up back in the day .

Brookshire studied Stoddard . Stoddard invented the Polydyne which was used to watch vibration , harmonics through the valve springs , to examine valve seat bounce and on and on .

It was Brookshire who first used or sold the unsymmetrical cam lobe as I recall .

Before Holley purchased Lunati , Lunati bought all of General Kinetics masters lobes . I think they sat on them for a few years then sold them to whomever grinds the Summit line . I could be wrong on the latter but they do look familiar .


Anyway , IMO Lunati is lucky to have Brookshire . They needed a good camshaft