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Author Topic: Modifying the stock headpipe for more power!  (Read 33156 times)

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Fullsac Performance

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Modifying the stock headpipe for more power!
« on: February 10, 2009, 06:44:02 PM »
Heres a few pics I shot today while modifying a stock CVO headpipe.

Pic 1.
Headpipe VS bandsaw. Headpipe lost miserably revealing "power robbing obstruction".
« Last Edit: February 10, 2009, 06:50:06 PM by Fullsac Perf »
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Steve@fullsac.com  www.fullsac.com
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Fullsac Performance

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Re: Modifying the stock headpipe for more power!
« Reply #1 on: February 10, 2009, 06:47:14 PM »
Pic 2

Obstruction VS air chissel.
Obstruction lost miserably revealing how the front cylinders headpipe is extended, bringing it much closer to face of the cat. There, I said it. Cat cat cat cat.
« Last Edit: February 10, 2009, 06:57:14 PM by Fullsac Perf »
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Fullsac Performance

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Re: Modifying the stock headpipe for more power!
« Reply #2 on: February 10, 2009, 06:48:30 PM »
Pic 3

Surgery over, all welded up and ready to rock!
« Last Edit: February 10, 2009, 06:51:07 PM by Fullsac Perf »
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RK2000

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Re: Modifying the stock headpipe for more power!
« Reply #3 on: February 10, 2009, 07:05:35 PM »
It's a wonder that there is any flow at all thru that pipe. It would be intresting to know how much pressure drop is across the cat.
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murphy

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Re: Modifying the stock headpipe for more power!
« Reply #4 on: February 10, 2009, 07:14:44 PM »
Pretty nice weld there mister!
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Fullsac Performance

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Re: Modifying the stock headpipe for more power!
« Reply #5 on: February 10, 2009, 07:17:30 PM »
Quote from: RK2000 on February 10, 2009, 07:05:35 PM
It's a wonder that there is any flow at all thru that pipe. It would be intresting to know how much pressure drop is across the cat.
The dyno says its about an 8 HP pressure drop.

Steve
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RK2000

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Re: Modifying the stock headpipe for more power!
« Reply #6 on: February 10, 2009, 07:20:30 PM »
8 HP is pertty significant
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Fullsac Performance

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Re: Modifying the stock headpipe for more power!
« Reply #7 on: February 10, 2009, 07:23:29 PM »
Quote from: RK2000 on February 10, 2009, 07:20:30 PM
8 HP is pertty significant
Yes! And additional fuel (remapping) is required to take full advantage of the additional airflow.

Steve
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wreckman 42

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Re: Modifying the stock headpipe for more power!
« Reply #8 on: February 10, 2009, 07:59:31 PM »
Did you just use the pen mark to line up the pipe after the cut? Did you mig or tig it? I am pretty with a welder and am thinking about the same surgery on mine.
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planenut

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Re: Modifying the stock headpipe for more power!
« Reply #9 on: February 10, 2009, 08:38:21 PM »
thanks Steve for the input

I will call tomarrow about sending mine to you
    thanks
        Jon
« Last Edit: February 10, 2009, 10:31:42 PM by planenut »
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Fullsac Performance

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Re: Modifying the stock headpipe for more power!
« Reply #10 on: February 10, 2009, 10:19:04 PM »
Quote from: wreckman 42 on February 10, 2009, 07:59:31 PM
Did you just use the pen mark to line up the pipe after the cut? Did you mig or tig it? I am pretty with a welder and am thinking about the same surgery on mine.

I draw a line with a sharpie on both sides before I cut. Makes lining it back up idiot proof.  I Mig welded this one. The Tig would have a cosmetic advantage, but for what? Look at Harley's mig welds on both sides. It's all under the shields anyways. After the last pic, I sprayed the weld with a little Hi temp paint.

Steve
« Last Edit: February 10, 2009, 10:23:37 PM by Fullsac Perf »
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JP

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Re: Modifying the stock headpipe for more power!
« Reply #11 on: February 10, 2009, 11:28:11 PM »
So the people here that have used the 1.6 core bit only remove the cat that is restricting the right side tail pipe? The cat is still restricting the left side due to it`s oval shape in the pipe, that the bit could not get. I this correct. Thank`s
« Last Edit: February 10, 2009, 11:30:35 PM by JP »
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planenut

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Re: Modifying the stock headpipe for more power!
« Reply #12 on: February 10, 2009, 11:38:56 PM »
I would say YES     :2vrolijk_21: :2vrolijk_21: :2vrolijk_21:

since the sock pipe keeps eluding me >:(,mine will have to meet the untimely death of steve :o
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Re: Modifying the stock headpipe for more power!
« Reply #13 on: February 10, 2009, 11:42:07 PM »
Takes notes and sends link to my metal fabricating buddy...
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sportygordy

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Re: Modifying the stock headpipe for more power!
« Reply #14 on: February 10, 2009, 11:49:02 PM »
You guys ain't using the 'oval' core bit  ???  :nixweiss: :nixweiss: :nixweiss:
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