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Isky Super or Mega cam?

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Old 03-26-2009, 12:45 PM   #1
_Remi
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Default Isky Super or Mega cam?

Hi friends,

My mechanic had a chance to drive the car and he told me that changing gears now would be a "patch" as opposed to a real solution to fix my lack of torque. The car is really sluggish at low-mid range, changing the heads to nice performer while keeping the stock cam was definitely not a good idea. I should have had it changed at the same time, I would have saved a lot of money! Anyway, I cannot go back in time and have decided to do it as soon as possible

I know that some of you here told me that Isky cams were old as opposed to newer design like Comp. I understand that but I will go with them for the following three reasons:

- My mechanic has a very extensive experience with Isky and has had great results
- On the other hand, due to some bad experiences he does not like the comp flat tappet cams
- I am not looking for a top notch setup and I want my mechanic to work with something that he likes

That said, I am hesitating between these two:

- Isky Supercam 262
- Isky Megacam 264

Does anyone here have experience with these cams along with Edelbrock Performer Heads? They give a rear end ratio with the cam specs, why is that? I don't get the link between a gear ratio and a cam...

What would be a nice duration/lift for my setup (see sig.)? I am looking for torque and power in the low to 5500 range.

Thanks
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Old 03-26-2009, 12:48 PM   #2
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Well since you mechanic has "extensive experience" with them, why don't you ask him?
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Old 03-26-2009, 12:53 PM   #3
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He he good point

He would recommend the Supercam 262 but since I don't really understand how to differentiate them, I'd like to have your opinion! Also, I forgot to mention that going roller would be too expensive.
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Old 03-26-2009, 01:58 PM   #4
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Regardless of the experience your mechanic has with them.. I'd be questioning why he didn't explain to you that the cam should have been upgraded from stock when the new heads and intake were installed. I'd seriously ask him for a deal since he didn't.

I'm assuming here that he didn't mention this.

Best thing to do would be to call Isky (323.770.0930) and ask them what cam would be your best choice.

The cam specs to rear gear is a rough guide. My Comp Cams roller cam and lifter set recommended 3.55 gears however I went with 3.25. I forget the exact reason but think it had to do with the power/torque of the cam and the best suited gears for it.
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Old 03-26-2009, 02:05 PM   #5
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Quote:
Originally Posted by Adrenolin View Post
Regardless of the experience your mechanic has with them.. I'd be questioning why he didn't explain to you that the cam should have been upgraded from stock when the new heads and intake were installed. I'd seriously ask him for a deal since he didn't.

I'm assuming here that he didn't mention this.
This guy is my new mechanic. He is not the one who installed the aluminum heads and the fact that I am seeing this one now is because the old one did not even talk about a cam swap at the first place.

Quote:
Originally Posted by Adrenolin View Post
Best thing to do would be to call Isky (323.770.0930) and ask them what cam would be your best choice.
I'll do it then.
Quote:
Originally Posted by Adrenolin View Post
The cam specs to rear gear is a rough guide. My Comp Cams roller cam and lifter set recommended 3.55 gears however I went with 3.25. I forget the exact reason but think it had to do with the power/torque of the cam and the best suited gears for it.
Thanks
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Old 03-26-2009, 03:31 PM   #6
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I still wouldn't go with an isky cam for a street car. You're going to end up with a narrow power band, making the car much less streetable (and enjoyable) than if you went with a more modern Comp Cams or Lunati Voodoo grind. Your mechanic should be smart enough to realize that just because he had a cam fail from Comp Cams doesn't necessarily mean that the cam was bad. More likely he chopped a cam during the period where the API was removing zinc from street oils and before the aftermarket world realized that was a problem and blamed the manufacturer. I also doubt he knows much about picking an aftermarket cam to match an engine.
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Old 03-26-2009, 03:32 PM   #7
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Remember, duration produces RPM and the lift produces torque. The Mega cam has a little more lift so a little more torque. Also, with a 108 lobe center, it will sound bigger than it is. (Lobe center is when both the valves are open at the same time). A better choice is a 110 like a Comp Cam or even a 112 or 114. You only need the 108, 106 with something that has too high compression otherwise, you loose compression.
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Old 03-26-2009, 06:11 PM   #8
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Thanks for your feedback.

I am curious: what are the specs (lift / duration / lobe center) of the stock cam I have now?

The Supercam 262 is supposed to make power between 2000-5500, why would I end up with a narrow power band?
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Old 03-26-2009, 07:40 PM   #9
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crane z series or lunati voodoo

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Old 03-26-2009, 10:46 PM   #10
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why dont you look at the Edelbrock RPM cam??? I had that cam after a Comp Cam 270 and even though it was bigger it was much more streetable
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Old 03-26-2009, 11:59 PM   #11
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Quote:
Originally Posted by Iskwezm View Post
why dont you look at the Edelbrock RPM cam??? I had that cam after a Comp Cam 270 and even though it was bigger it was much more streetable
That could be an option and this way I would not take any risk to end up with something that does not work correctly together.

Problem is:

Can I take the Performer RPM cam even if I only have a Performer Intake and Performer Heads? Basically I would be between the Performer and the Performer RPM package right?

Given the fact that I don't do anything myself, a cam swap is a lot of money and I would not want to have to redo it
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Old 03-27-2009, 08:28 AM   #12
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http://www.lunatipower.com/Product.aspx?id=1643&gid=287

or

http://www.lunatipower.com/Product.aspx?id=1644&gid=287
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Old 03-27-2009, 09:07 AM   #13
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the ole cam dilemma. I don't know the isky cams. I do understand that people stick with what they have experience, but I'd personally would go for comp or lunati.
The edelbrock rpm is what I have in new engine but haven't driven it yet so can't comment. There's a few people around that say that ther performer (not rpm) is a bad choice as it's too mild.

I don't see a reason on why not to use the rpm. But: in any case you have to make sure if your valves/springs can handle the lift. and you need to check for piston and valve clearance.

he recommends:

262 Supercam .445 262° 108° (1974-up)
or
264-Mega-cam Hyd. .480” 264° 214° 108°

if you'd take the xe256 from comp cams:
rpm range 1000 to 5200
lobe: 110
lift .477/.484

I don't know that cam but usually take it as a reference for any stock-ish 289/302
better rpm range. should match your gearing. better idle and ~same lift as the 264 mega

The Vodoo Part Number: 61002 mys77stang is suggesting
# Advertised Duration (Int/Exh): 262/268
# Duration @ .050 (Int/Exh): 219/227
# Gross Valve Lift (Int/Exh): .499/.522
# LSA/ICL: 112/108
# Valve Lash (Int/Exh): Hyd/Hyd
# RPM Range: 1400-5800

springs and clearance _might_ be an issue. depends on what is installed on your perfromer heads.

In the end ... if you are having it installed with the man then you might want to go with his opinion. at least ask him what bad experience he had with comp/cams voodoo.

Kalli

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Old 03-27-2009, 10:29 AM   #14
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I'd look for a hydraulic roller cam with intake duration @ 0.050" in the two-teens to low 220's. It's a little more $ up front, but you won't be nearly as likely to wipe a lobe and end up having to do it over again (most current oil formulations are not flat-tappet cam-friendly).

For a given upper rpm capability and HP output the HR cam will be nicer (read, smoother and stronger) at the low to midrange revs that represents most of your driving.


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Old 03-27-2009, 12:17 PM   #15
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One of the problems with most roller conversions is that they require drilling the lifter valley for the spider assembly; not something I'd want to do without tearing the engine down first.

That said, I think one of the cam manufacturers has a link-bar lifter setup for roller conversions.

The other problem is the lack of cam choices for a roller conversion. There just aren't that many reduced-base-circle cams out there to pick from.
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Old 03-28-2009, 09:50 PM   #16
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Thanks.

What would be the price difference to go to roller cam?

I am more and more thinking about the RPM Performer Cam as I don't want to take any risk and I know it will be matching my heads.

Do you think that it would be useful to try to dyno desktop the Isky vs the Performer RPM to compare?
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Old 03-29-2009, 08:36 AM   #17
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Quote:
Originally Posted by _Remi View Post
Do you think that it would be useful to try to dyno desktop the Isky vs the Performer RPM to compare?
If you have access to DD, it can't hurt to run a few simulations. Just be careful about over-interpreting the results. I think I'd put more faith in the shapes of the torque curves than in differences in peak numbers of only a few ft-lbs.


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Old 03-29-2009, 10:16 AM   #18
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that performer intake is slowing you down too you know, the regular performer is not much better than a factory 4bbl intake.
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Old 03-29-2009, 01:16 PM   #19
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Quote:
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that performer intake is slowing you down too you know, the regular performer is not much better than a factory 4bbl intake.
Ok, thanks.

I will have it replaced while putting the new cam then. Should I go for the RPM or the RPM Air Gap? The first one would save me about $100.
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Old 03-29-2009, 05:57 PM   #20
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Quote:
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Ok, thanks.

I will have it replaced while putting the new cam then. Should I go for the RPM or the RPM Air Gap? The first one would save me about $100.
if you're going for it the rpm will do.

i'll check on what i can do with isky vs rpm cam on the desktop dyno.
That's:
289 engine, compression 9.5:1, performer heads, headers and mufflers, 600cfm
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Old 03-29-2009, 05:57 PM
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