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Old 02-12-2011, 12:12 PM   #1
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Cams

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. Still a few months out on release.

The original Helix 2 cams are in stock though. Sold 10 before I even opened the crate.
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Old 02-12-2011, 12:30 PM   #2
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Don...I am ready with an 04. You could inspect my Helix 2 with a hard hundred k!
 
Old 02-12-2011, 12:49 PM   #3
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Awesome! Lets roll baby!

Gimme a few weeks to get the new grind dialed in and I will send it over.
 
Old 02-13-2011, 03:43 PM   #4
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Great...this will give me motivation to fix a couple of other small things for some dyno time.
 
Old 04-28-2011, 08:46 AM   #5
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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!
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Old 05-13-2011, 07:50 AM   #6
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Overlap for an H2b should be ~74.6* @ seat timing.
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Old 05-13-2011, 08:30 AM   #7
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that sounds excessive.
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Old 05-13-2011, 09:03 AM   #8
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Not for seat timing... maybe .050" is easier for you? (-22.1*)
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Old 05-16-2011, 11:37 AM   #9
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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.
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Old 05-16-2011, 11:50 AM   #10
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Don....how do I know which H2 is in my truck?
 
Old 05-16-2011, 11:58 AM   #11
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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.
 
Old 05-16-2011, 04:37 PM   #12
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Thank you!
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Old 05-16-2011, 04:52 PM   #13
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Quote:
Originally Posted by Soup Nazi View Post
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.
What's the overlap on a stock Cummins (non marine) 12 valve cam?
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Old 05-16-2011, 09:20 PM   #14
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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!

FWIW BigBlue, my spreadsheet shows -22.5*... Don?
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Old 05-17-2011, 10:21 AM   #15
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Quote:
Originally Posted by Big Blue24 View Post
What's the overlap on a stock Cummins (non marine) 12 valve cam?

-24.1
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Old 05-17-2011, 10:23 PM   #16
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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?
 
Old 05-18-2011, 12:10 PM   #17
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yes, but the H2 is not a final product yet. Getting close. Just a few tweaks left.
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Old 05-19-2011, 01:57 AM   #18
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cool, looking foward to the results
 
Old 08-12-2011, 03:38 PM   #19
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Any update on the Cams Don?
 
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