Cams

Soup Nazi

Soup Nazi

The artist formerly known as Don M
Joined
Sep 26, 2006
Messages
1,197
Still working on new grinds, but have targeted some profound changes for the 03-04 CR and the 12V.

The old Helix 2 is still pretty good in the 04.5 - 07, but we found some tweaks there as well. One would have to kill one of my testers to get the new cam back out of his engine. LOL Still a few months out on release.

The original Helix 2 cams are in stock though. Sold 10 before I even opened the crate.
 
Don...I am ready with an 04. You could inspect my Helix 2 with a hard hundred k!
 
Awesome! Lets roll baby!

Gimme a few weeks to get the new grind dialed in and I will send it over.
 
Great...this will give me motivation to fix a couple of other small things for some dyno time.
 
Don- could you tell me (PM if needed) the specs on the Helix2? I am primarily looking for the degrees of valve overlap, I think you said the LSA is 110.3*. Thanks!
 
Not for seat timing... maybe .050" is easier for you? (-22.1*)
 
Mike is pretty close. It is spec'd to be -24.4 and his may have measured the -22.1.

For comparison:
The stock Cummins marine is -25.6 degrees Overlap
The stock Cummins 24VP is -33.4 degrees Overlap

The Helix 2 has changed a bunch now anyway, so we are talking the older grind from 2004-2005 time frame in this thread.
 
All the cams are the original Helix 2. The new grind is not very well distributed yet. Only a handful have it.

Actually there may be one or two more tweaks before final release of the new grind.
 
Soup Nazi said:
Mike is pretty close. It is spec'd to be -24.4 and his may have measured the -22.1.

For comparison:
The stock Cummins marine is -25.6 degrees Overlap
The stock Cummins 24VP is -33.4 degrees Overlap

The Helix 2 has changed a bunch now anyway, so we are talking the older grind from 2004-2005 time frame in this thread.
Click to expand...

What's the overlap on a stock Cummins (non marine) 12 valve cam?
 
Darn - my lobe profiles are scattered a degree or two around Don's numbers... time to either get my sliderule recalibrated or update the prescription on my monocle! :hehe:

FWIW BigBlue, my spreadsheet shows -22.5*... Don?
 
Don, i purchased an older Helix 2 from Tim Barber for my 03 motor, it has never been used, is there any way i can send it in to u to have it reground to the new specs or would i have to sell mine and purchase a new one?
 
yes, but the H2 is not a final product yet. Getting close. Just a few tweaks left.
 
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