Anyone adjust their Intake runner length?
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
Anyone adjust their Intake runner length?
Has anyone adjusted their intake runner length to match a new cam, or just wanted to tweak the power curve for their particular application? The stock 06 Z06 length measures 13", 7.5 for runner and 5.5 in head. That's 5,788 RPM. OK, so it's also designed for street.
But I do HPDEs and with my cam it drops to 5,379 RPM. So hmmm take an inch off? What do you think? What's the length of the C5R's or C6R's? Bet that's hard to find out.
But I do HPDEs and with my cam it drops to 5,379 RPM. So hmmm take an inch off? What do you think? What's the length of the C5R's or C6R's? Bet that's hard to find out.
Team Owner
Joined: Oct 2001
Posts: 56,381
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Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Has anyone adjusted their intake runner length to match a new cam, or just wanted to tweak the power curve for their particular application? The stock 06 Z06 length measures 13", 7.5 for runner and 5.5 in head. That's 5,788 RPM. OK, so it's also designed for street.
But I do HPDEs and with my cam it drops to 5,379 RPM. So hmmm take an inch off? What do you think? What's the length of the C5R's or C6R's? Bet that's hard to find out.
But I do HPDEs and with my cam it drops to 5,379 RPM. So hmmm take an inch off? What do you think? What's the length of the C5R's or C6R's? Bet that's hard to find out.
Thread Starter
Drifting
Joined: Oct 2005
Posts: 1,549
Likes: 1
From: Roanoke Virginia
I've been looking at the Harrop for a while. 
The uppper runers look shorter (wonder what it's tuned to), indiv TBs. But not fly by wire, though I could make a TPS and actuator motor fit, if I could spend 8 grand. What a wonderful idea! I think I'm relagated to the lowly position of Mr homebrew man. 
The uppper runers look shorter (wonder what it's tuned to), indiv TBs. But not fly by wire, though I could make a TPS and actuator motor fit, if I could spend 8 grand. What a wonderful idea! I think I'm relagated to the lowly position of Mr homebrew man.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
Not hating here and as a discussion point only: since the power levels far exceed the ability to get traction on the street and track use will not better FI use, whats the point?
Current LS7 users have gotten 630rwhp with the current technology I dont really see what is to be gained. Solid roller 10k redline for N/A operation?
What I am asking here is to understand the application and how it improves upon the current available modes. Having runner length that allows peaks at other rpm's than the current 6300 rpm options does what?
Using such an intake on an LS2 isnt cheaper than getting a forged 427 from Lingenfelter for $6300. A TT kit installed is 10k and the runner change fro more rpm's will invlove massive valvetrain modifications.
Current LS7 users have gotten 630rwhp with the current technology I dont really see what is to be gained. Solid roller 10k redline for N/A operation?
What I am asking here is to understand the application and how it improves upon the current available modes. Having runner length that allows peaks at other rpm's than the current 6300 rpm options does what?
Using such an intake on an LS2 isnt cheaper than getting a forged 427 from Lingenfelter for $6300. A TT kit installed is 10k and the runner change fro more rpm's will invlove massive valvetrain modifications.
Last edited by SpinMonster; Mar 2, 2008 at 06:56 PM.
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Safety Car
Joined: Jun 1999
Posts: 3,570
Likes: 3
From: Austin, Singapore, Kuala Lumpur, Houston, Dallas, Hong Kong, Elgin, etc.. Texas
Not hating here and as a discussion point only: since the power levels far exceed the ability to get traction on the street and track use will not better FI use, whats the point?
Current LS7 users have gotten 630rwhp with the current technology I dont really see what is to be gained. Solid roller 10k redline for N/A operation?
What I am asking here is to understand the application and how it improves upon the current available modes. Having runner length that allows peaks at other rpm's than the current 6300 rpm options does what?
Using such an intake on an LS2 isnt cheaper than getting a forged 427 from Lingenfelter for $6300. A TT kit installed is 10k and the runner change fro more rpm's will invlove massive valvetrain modifications.
Current LS7 users have gotten 630rwhp with the current technology I dont really see what is to be gained. Solid roller 10k redline for N/A operation?
What I am asking here is to understand the application and how it improves upon the current available modes. Having runner length that allows peaks at other rpm's than the current 6300 rpm options does what?
Using such an intake on an LS2 isnt cheaper than getting a forged 427 from Lingenfelter for $6300. A TT kit installed is 10k and the runner change fro more rpm's will invlove massive valvetrain modifications.
Drifting
Joined: Jul 2000
Posts: 1,861
Likes: 1
From: Bremerton WA
St. Jude Donor '09
Within the stock intake architecture, altering runner length is a waste of time. I've done it on the LS2 a while back. As the L76 is basically the same style I'll say its not worthwhile either. Now, if you are not bound by the stock dimensions, it could be very rewarding. But the cost is very prohibitive. Even the Hogans are big $$$$ and hogan look-a-likes are still $2500.
Better to find power as others have suggested. A little over $3k buys a 402 or bigger shortblock.
Better to find power as others have suggested. A little over $3k buys a 402 or bigger shortblock.
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
If there is a displacement guideline and you cant use forced induction, then that may be an applicaton. I'm just not sure why its considered unless there are people messing with it 'because its there'.
Team Owner
Joined: Sep 2003
Posts: 43,084
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From: Raleigh / Rolesville NC
http://crdengines.com/index.html
Also look at the kinsler intakes.
http://www.kinsler.com/page--Home-Page--13.html
Last edited by AU N EGL; Mar 3, 2008 at 02:20 PM.
Safety Car
Joined: Jan 2001
Posts: 3,879
Likes: 3
From: Hobart, WI
In general, as compared to stock, longer runners will increase torque and shorter will increase hp at higher rpm. It is a tipping point issue because an increase in one is is usually at the expense of the other.
The guys who try carbs or sheet metal intakes (NA) are painfully aware of the consequences of this trade off. On the dyno it is almost 1:1.
Heads and cam is a much more direct approach, and it fits under the hood.
The guys who try carbs or sheet metal intakes (NA) are painfully aware of the consequences of this trade off. On the dyno it is almost 1:1.
Heads and cam is a much more direct approach, and it fits under the hood.
