nastee383

First I have to admit I'm a COMP fan because of my current XE262 but I ran two comparable cams from ISKY and COMP through Desktop Dyno and was a little surprised at the results. I know DDT is not the most accurate but with everything being the same (engine components) the ISKY ate the COMP alive. The cams are COMP XR288HR 236/242 @.050, 71 degrees of overlap, 110LC, .555/.576 lift w/1.6 rockers. The ISKY is also a hydraulic roller. 234/246 @.050, 68 degrees of overlap, 110LC, .565/.587 lift w/1.6 rockers. Here are the results.
COMP HP TQ ISKY HP TQ
2000 133 349 156 409 +23 +60
2500 178 373 203 427 +25 +54
3000 225 394 256 448 +31 +54
3500 287 431 316 475 +29 +44
4000 352 463 378 496 +26 +33
4500 416 485 435 507 +19 +22
5000 469 492 483 507 +14 +15
5500 509 486 514 491 +5 +5
6000 526 460 526 460 0 0
6500 531 429 525 424 -6 -5

I'm thinking about calling AR(if I can reach them) :D and telling them to switch from the COMP to the ISKY. Why do you suppose the ISKY is so much better in the low and mid range??? The seat to seat valve timing events don't appear to be much different. IVO 31vs38 IVC 71vs70 EVO 77vs81 EVC 37vs33. (ISKY is first)

Ironcross

Iskenderian makes good racing camshafts. Never used hydraulic cams or Comps but a DTD is not any way to compare camshafts. It just makes you feel good or bad. Best way is to get the advice from the manufacturer. Too many variables. :thumbs:

Corey_68

Isky makes quality cams, I remember my dad saying that's the only brand cam he's run in his Hemi GTX and BB C3's. :cheers:

442olds

Given that DTD's only know the valve timing events that you feed it. And not the actual profile of the cam its very hard to compare camshafts on DTD. They will help you pick a cam for your application, but you should only look at the numbers as an improvement over whatever you deteremined to be your baseline. The actual power numbers could be much different from what the DTD says.

Now if you have soemthing like Performance trends software and have a lift profile of the camshaft at every degree or interpolate between every 5 to 10 degrees, then you will be that much closer to real life comparisons between cams. Just picking solid(flat/roller) or hydraulic (flat/roller) and letting the computer determine the opening rate and closing rates will yeild much different numbers.

I bet if you found a Comp Cam with the exact same numbers as your Isky, you'd get the same results in a side by side comparison. What you really need to look at is where the torque and horsepower are at and how flat the torque curve is and make a judgement call that you want that curve rather than that peak power. The curve will probably be close but the actuall numbers you'll see in real life will on a different scale but should look close to the curve you got from DTD.

Its best to call the manufacturers of the cams if you are unsure of which one to use. Comp has probably tested a similar setup and can tell you where your engine will end up, ballpark at least.

comp

:cool: :thumbs: post

verskel

:iagree: .....ISKY rocks ! ....they've been helping hot rodders for over 50 years. :cheers:

Ed Iskenderian - "camfather"

Ed saw that racers could benefit from the advancement of higher-technology in racing so he created the first Hard- Face Overlay camshafts in the industry and became the first to employ computers in camshaft design.

http://www.iskycams.com/about_index.html

gkull

Nastee383 - DD2000 has some real problems of rewarding large split duration cams. 234/246 is 12 degree split. In the real world a cam like this would be best suited for a restrictive exhaust with cats and small exhaust pipes and mufflers.

In low restriction street/track cars splits of 4-8 degrees is more desirable.

IMO - DD2000 is more realistic when you put in the cam event numers for .050 lift. comp cams are ground with 4 degrees advance. So I install mine with 4 degrees retard. try that with you last runs and see if it come closer to the Isky

nastee383

I found the big difference was because I had the ISKY entered "@.050" and the COMP "seat to seat". When I entered the ISKY "seat to seat" the numbers were right in line with the COMP. COMP doesn't have the "@.050" timing events on it's website. Does anyone know where COMP's "@.050" numbers can be found?