header length?

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header length?

Post  gmsmkr on November 16th 2014, 10:28 pm

I'm finally getting started on my front exit headers and need some direction.

I have my flanges with a 2" primary but what length do I need to make my tubes is there a magic length or am I over thinking this just run them and make them collect where I want or what? Thanks for all the help and direction....
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Re: header length?

Post  dfree383 on November 17th 2014, 1:01 am

What's the combo.

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Re: header length?

Post  gmsmkr on November 17th 2014, 9:41 am

Combo is a little 472 with scj-b heads and some nitrous
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Re: header length?

Post  yellowhorse7 on November 17th 2014, 9:51 am

Well this thread is going to get interesting......

Confucius says: "about to be given is much bad info"
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Re: header length?

Post  yellowhorse7 on November 17th 2014, 9:54 am

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Re: header length?

Post  dfree383 on November 17th 2014, 10:01 am

yellowhorse7 wrote:Well this thread is going to get interesting......

Confucius says: "about to be given is much bad info"

So give the good info ohhhh wise one......
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Re: header length?

Post  dfree383 on November 17th 2014, 10:03 am

gmsmkr wrote:Combo is a little 472 with scj-b heads and some nitrous

That's a little vague.
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Re: header length?

Post  gmsmkr on November 17th 2014, 11:23 am

Sorry guys still early for me

472 with 10.8 static
solid roller comp 292 cam with scj-b heads
Victor 460 direct port with a 250 shot and a 1050 dominator

This is the combo for my 2000 mustang chassis have not made up my mind on a trans yet.
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Re: header length?

Post  yellowhorse7 on November 17th 2014, 11:50 am

dfree383 wrote:
yellowhorse7 wrote:Well this thread is going to get interesting......

Confucius says: "about to be given is much bad info"

So give the good info ohhhh wise one......

Sure. But i'll wait until I see some other stuff....ya know...merge collector design, primary diameter and tube length, the "it don't matter on a nitrous engine" comment......
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Re: header length?

Post  dfree383 on November 17th 2014, 11:54 am

I'm guessing race car only? The issue I see is it seems the front exit stuff gets a little short.

2" would work OK, But IMO 2 1/8 or a 2"-2 1/8" step would be a little better. as far as length I'd guess something in the 28-30" range would be a good middle of the road.

Collector selection.... Now things get interesting.  

If you're computer and number savvy Pipemax is a good program for calculating this stuff.


Last edited by dfree383 on November 17th 2014, 12:05 pm; edited 2 times in total
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Re: header length?

Post  yellowhorse7 on November 17th 2014, 11:55 am

http://www.yellowbullet.com/forum/showthread.php?t=716234&highlight=


I started this a while ago on YB, fishing for some people to think a bit.
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Re: header length?

Post  gmsmkr on November 17th 2014, 12:06 pm

Yes it is now a track only car

Yellowhorse that is really what I am trying to ask also but can't find a answer to it my self.
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Re: header length?

Post  gmsmkr on November 17th 2014, 12:07 pm

dfree383 wrote:I'm guessing race car only? The issue I see is it seems the front exit stuff gets a little short.

2" would work OK, But IMO 2 1/8 or a 2"-2 1/8" step would be a little better. as far as length I'd guess something in the 28-30" range would be a good middle of the road.

Collector selection.... Now things get interesting.  

If you're computer and number savvy Pipemax is a good program for calculating this stuff.

Thanks Dave that will get me going a direction
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Re: header length?

Post  fe50stang on November 17th 2014, 6:45 pm

Nothing says front exit like a pair of zoomies!
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Re: header length?

Post  gmsmkr on November 17th 2014, 6:49 pm

fe50stang wrote:Nothing says front exit like a pair of zoomies!

Lol



What kind of power do you guys think it will make with out nitrous?
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Re: header length?

Post  FalconEh on November 17th 2014, 7:27 pm

yellowhorse7 wrote:Well this thread is going to get interesting......

Confucius says: "about to be given is much bad info"

fe50stang wrote:Nothing says front exit like a pair of zoomies!

Might want to try these for protection when tuning that Dommie http://www.4statetrucks.com/exhaust/semi-truck-5in-chrome-rain-cap-flat-top-stack_10267.asp Razz
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Re: header length?

Post  bigblok2000ranger on November 17th 2014, 10:58 pm

I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?


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Re: header length?

Post  dfree383 on November 17th 2014, 11:46 pm

bigblok2000ranger wrote:I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?



I suppose if you where going fast enough it would have a ram effect.

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Re: header length?

Post  yellowhorse7 on November 18th 2014, 8:03 am

dfree383 wrote:
bigblok2000ranger wrote:I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?



I suppose if you where going fast enough it would have a ram effect.


X2. For a drag car you'll be fine. Bonneville.....not so much.
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Re: header length?

Post  DanH on November 19th 2014, 5:21 am

yellowhorse7 wrote:
dfree383 wrote:
bigblok2000ranger wrote:I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?



I suppose if you where going fast enough it would have a ram effect.


X2. For a drag car you'll be fine. Bonneville.....not so much.

what about exhaust that exit on the (f/fender) front or rear side of the tire?

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Re: header length?

Post  yellowhorse7 on November 19th 2014, 7:44 am

DanH wrote:
yellowhorse7 wrote:
dfree383 wrote:
bigblok2000ranger wrote:I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?



I suppose if you where going fast enough it would have a ram effect.


X2. For a drag car you'll be fine. Bonneville.....not so much.

what about exhaust that exit on the (f/fender) front or rear side  of the tire?

The only thing that has been "proven" is that:

1. If the car makes enough steam then the exhaust that is exiting, providing that it is aimed in the correct direction, helps keep the front end down. Bull horns (the idea behind them....they are not new) were meant to be turnable.

2. The weight over the front tires aids as a tuning tool to help control power wheelies; ones that usually cause an "oh shit" response @ the 330 mark. It used to be that we wanted to set the motor back as close to the COG as possible but with the small tires and big power we are actually moving stuff forward.
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Re: header length?

Post  gmsmkr on November 19th 2014, 9:25 am

yellowhorse7 wrote:
DanH wrote:
yellowhorse7 wrote:
dfree383 wrote:
bigblok2000ranger wrote:I have a question perhaps a stupid one but what the hell, I am gonna ask it anyways; does the g-force of acceleration negatively affect exhaust flow on a forward facing header?



I suppose if you where going fast enough it would have a ram effect.


X2. For a drag car you'll be fine. Bonneville.....not so much.

what about exhaust that exit on the (f/fender) front or rear side  of the tire?

The only thing that has been "proven" is that:

1. If the car makes enough steam then the exhaust that is exiting, providing that it is aimed in the correct direction, helps keep the front end down. Bull horns (the idea behind them....they are not new) were meant to be turnable.

2. The weight over the front tires aids as a tuning tool to help control power wheelies; ones that usually cause an "oh shit" response @ the 330 mark. It used to be that we wanted to set the motor back as close to the COG as possible but with the small tires and big power we are actually moving stuff forward.

Shhhhh don't tell everybody about our small tire tricks Laughing the turbo and supercharged guys are still moving stuff back but most are for clearance and now days they change them in front of the core support. That puts more on the nose
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Re: header length?

Post  butterbean on November 19th 2014, 9:33 am

well GMsmkr did you get the answer you were looking for? confused
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Re: header length?

Post  gmsmkr on November 19th 2014, 9:37 am

butterbean wrote:well GMsmkr did you get the answer you were looking for? confused

Yes lol. Dave got me going in the right direction I'm only going to have about 4"s collecting before they come out the side of my front bumper cover. Not really where I wanted them but that's about where they will have to be.
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Re: header length?

Post  cool40 on November 19th 2014, 11:26 am

Go out the hood! You could make them as long as you want and get all the downforce to keep it on the ground. Cool
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