Anyone running a Comp Nostalgia Cam?

[calpolymustang]

I flattened a lobe and am debating between a XE256H and the Nostalgia N+271H. I dont want to go with any more lift cause I dont want a press-in stud to pull out.

Basically, the Nostalgia is a hydraulic version of the K-code cam, with a few spec changes.
I'm just wondering if anyone has one in their car and if the idle is loppey.


XE256H: 477/484 lift, 212/218 @50, 1000-5200rpm

Nostalgia Plus: 480/475 lift, 219/226 @50, 2200-6400rpm

They will both work with a stock stall, and I can predict the XE256H will have more bottom end, but rough idle is music to the ears.

Thanks.

 

[ratio411]

What is the lobe center of the 271 cam?
The XE cam is 110.

The 271 will lope a little more by virtue of it's higher duration alone.
However, the split duration will cause more of a rough, disorganized sound.
A single duration makes a more melodic lope...

I run a Lunati with .480(something) lift and 218 duration at .050" on 110 LCA
It lopes real nice with small cubes (302). I am running press ins too, so that is why Lift<.500"
Comp makes the exact same cam, but a little less lift. It is the 268 Magnum.
Same all around except the lower lift.

I will put a link to my idle on the post, but it is hosted by another board I frequent.
Hopefully it won't want you to sign up to listen to the clip.

Anyway, if that 271 has a high LCA, that will knock down the lope quite a bit.
Higher LCA will also aggrevate any detonation and such if you have issues with that.
http://mmb.maverick.to/gallery/misc.php?do=downloadfile&i=2767

 

[calpolymustang]

271 lobe: 112
XE256H: 110

I like the idea of the 271 rough idle, but i just dont know if that cam is going to lack on the bottom end. especially since i have a stock converter.

Thanks for the info/video. Sounds like open exhaust?

 

[ratio411]

Thanks for the info/video. Sounds like open exhaust?

No.
2.5" Thrush turbos dumped at the axle.

 

[htwheelz67]

I think the comp cam should work great, I dont think you will lose much bottom if any, comp grinds most of thier cams 4-5 degrees advanced, I went from a comp 260 to a 268h in an engine and did not loose any bottom at all. I would still look into the XE line over the nostalgia grind as it would be a newer profile and be more streetable like the xe 262h.

 

[65fastbackresto]

How exactly do you flatten a lobe...

On a cam anyway?

 

[htwheelz67]

improper break in, excessive spring pressure, newer oils dont have enough zinc content, lousy metals used in cams and lifters or defective cores, plugged oil passages, used lifters on a new cam.......etc etc etc once I went to a roller I wouldnt go back to a flat tappet unless maybe a solid flat tappet for racing or on a major budget, rollers cost more but usually give better performance, quicker ramps, better idle, lifters are reusable. If you have to do a flat tappet cam swap twice, wheres the savings over a hyd roller?

 

[65ShelbyClone]

How do you flatten a lobe?

Something goes wrong between the lifter and cam and one wears down the other. Since flat cams are often iron and lifters are hardened steel, the lifter wins. The result is a worn down cam lobe and hence the term "flattened lobe."

However, the split duration will cause more of a rough, disorganized sound.
A single duration makes a more melodic lope...

No kidding? That explains why my Crane Powermax 2031 hydro roller sounds like you describe with its .513/.529 and 214°/220° @ .050" profile. Sounded like that with an X-pipe/Flows/tailpipes in a Fox3, true dual side exits, and my current Shelby-style side exits w/H-pipe. Didn't matter, nothing cleaned up the idle exhaust note. It even sounds kinda funny with open longtubes. Good, but funny.