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Author Topic: Headers  (Read 1887 times)

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Tivie

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Headers
« on: July 09, 2013, 11:03:50 AM »
I am trying to build my own headers for Hayabusa (Barracuda), wanted feedback about whether I could use 1 5/8 OD as opposed to 1 1/2 OD.  Reason being, I found a very cool prototype system for designing and fabbing headers, but smallest OD is 1 5/8.  Any input would be greatly appreciated.  Would like to go 4 into 2. ???
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Offline MC

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Re: Headers
« Reply #1 on: July 09, 2013, 12:03:10 PM »
The rule of thumb goes the larger the tube size the more PEAK HP you MIGHT be able to make, buy you will pay a price in the low and mid range power.

Also you DO NOT want a 4 into 2 header, you want a tri-y.
« Last Edit: July 09, 2013, 12:05:10 PM by MC »
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Offline fabr

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Re: Headers
« Reply #2 on: July 09, 2013, 01:32:42 PM »
Quote from: MC on July 09, 2013, 12:03:10 PM
The rule of thumb goes the larger the tube size the more PEAK HP you MIGHT be able to make, buy you will pay a price in the low and mid range power.

Also you DO NOT want a 4 into 2 header, you want a tri-y.
+1. or at least a 4 into 1.
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Offline fabr

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Re: Headers
« Reply #3 on: July 09, 2013, 01:37:25 PM »
Quote from: Tivie on July 09, 2013, 11:03:50 AM
I am trying to build my own headers for Hayabusa (Barracuda), wanted feedback about whether I could use 1 5/8 OD as opposed to 1 1/2 OD.  Reason being, I found a very cool prototype system for designing and fabbing headers, but smallest OD is 1 5/8.  Any input would be greatly appreciated.  Would like to go 4 into 2. ???
Have you quoted that proto system? I just bought the full set of the 1 3/4" size. Right at $1450 for a v8 including the cuting accessories. I have built many sets of headers but new car will be a definite challenge and felt the need to spend the bux to be able to design the upswept headers to actually be equal length and look good also since they will be ,more or less, the focal point of the rear portion of the car.Stuff should be here by end of week. I'll post up pics.

http://www.icengineworks.com/icewmain.htm
« Last Edit: July 09, 2013, 02:25:58 PM by masterfabr »
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Carlriddle

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Re: Headers
« Reply #4 on: July 10, 2013, 05:33:49 AM »
If you look at what the aftermarket guys are doing with size and tube ##'s thats probably a good place to go towards.  Giving up mid power for 10k rpm hp is crap in a offroad buggy.  Although in a 1-seat cuda with a busa I doubt there will be any disappointment.  ;D  So I wouldn't stress the header too much.
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Offline fabr

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Re: Headers
« Reply #5 on: July 10, 2013, 05:51:05 AM »
On a normally aspirated engine the header is quite important actually. On a turbo motor ,not so much. Stay with the 1.5" . If you want to buy the prototype kit,I'd just buy the 1 5/8" to model from. It will be very close to correct. I'm going to do stepped headers and using 1 3/4 modeling kit  it will be easy to lay out the step sizes using just the 1 3/4 kit. It just depends on whether or not the sizes will nest together.   
« Last Edit: July 10, 2013, 05:58:24 AM by masterfabr »
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline Carlriddle

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Re: Headers
« Reply #6 on: July 10, 2013, 06:07:07 AM »
Agreed  :-X  A-arm rear kinda gets in way of exhaust a bit, but usually you can run stock header to the merge area and turn it out the side.

BTW Tivie  :wwp: and build thread!  Dont leave us out.
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You can keep your CHANGE, I'd like to keep my DOLLAR.

Offline MC

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Re: Headers
« Reply #7 on: July 10, 2013, 10:44:11 AM »
Theres no way you would be able to tell the difference in top end power between the 1 5/8 and 1 1/2 dia headers, but you would easily notice the lack of low end and mid range power going with the 1 5/8 dia over the 1 1/2.
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Offline fabr

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Re: Headers
« Reply #8 on: July 10, 2013, 10:18:47 PM »
+1 You would never feel the difference upper rpm range. A dyno would.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline MC

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Re: Headers
« Reply #9 on: July 10, 2013, 11:36:15 PM »
Yep, everyone wants to race dynos.
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Offline fabr

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Re: Headers
« Reply #10 on: July 11, 2013, 05:50:49 AM »
LOL!!! SO true!
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

-----------------------------------------------------------
 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"

Offline dsrace

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Re: Headers
« Reply #11 on: July 11, 2013, 02:47:38 PM »
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