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Old 11-09-2007, 09:37 AM
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Pipes for headers theory...same length?

Have heard that the pipes should be kept the same length-not exactly sure why-sound syncronizing? What's anyone know on the subject and how important do you think it is?

Thanks,

Keith

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Old 11-09-2007, 10:42 AM
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it's kinda important.. helps w/ cylinder scavenging, keeping everything balanced
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Old 11-09-2007, 10:58 AM
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headers by Ed has a great website that helps explain this. But, in summary, if scavenging effects cylinder performance, and you have different scavenging effects in different cylinders, then you need to tune each cylinder separately. I suppose you could find a way to do this with timing, fuel injection, and spark plug heat ranges. But how do you do it with a carburetor? Ed's site is very informative. Search it out on Google, I think you'll enjoy reading his input.

Pat
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Old 11-09-2007, 12:52 PM
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Thanks Matt

Pat-I'll give that a read..Thanks

I wonder how much the ave exhaust sysem joints
pay attention to that?

Keith
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Old 11-09-2007, 01:43 PM
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Take a look at most long-tube SBC headers and it's pretty clear that they don't. But I think all Mass Produced headers are geared to make money and minimize inventories. These are realities of business. Rarely do I see a set of headers that even looks equal length. I bet most are off by 6 inches or more.

Anyway, enjoy the read.

Pat
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Old 11-09-2007, 02:06 PM
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One of the major issues in building equal length headers for a stock chassis is the fitment of the things..In the race cars we can do what we like so those are equal or very close to it..

It can be a real snakes nest trying to get the tubes equal in a stock chassis..

Sam
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Old 11-09-2007, 02:12 PM
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I've never made a set of pipes...but I do weld..
My guess is I'd come closer to equal lengths using
JC Whitney componets than a local exhaust guy...
For no other reason than it's important to me-but not
important to him...

Keith
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Old 11-14-2007, 10:42 PM
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Here are the headers I built for my rusty/ratty 48 chevy truck. Don't know what the actual difference it makes, but I had fun building them.....and they look cool to me.









Here is the main thread.

My rusty/ratty 48 chevy truck build (w/ pics)

Last edited by Flipper_1938; 11-14-2007 at 10:47 PM.
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Old 11-15-2007, 07:50 AM
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I may be confusing some issues between headers and street hookups..

Does it make any difference if the exhaust pipe assembles are not the same lengths?

Keith
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Old 11-15-2007, 09:04 AM
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Here´s some pipe info at ChevyHiPerformance.

"In order to keep the torque curve the same for all eight cylinders, it is important that primary pipes be equal in length. Exactly how equal they have to be is more critical on uncorked race cars than for the vast majority of mild-engined street cars running through mufflers. In most applications, pipe length deviation of 2 to 3 inches on a set of full-length headers is not a problem."
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Old 11-16-2007, 12:23 AM
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Quote:
Originally Posted by Slickriffs
I may be confusing some issues between headers and street hookups..

Does it make any difference if the exhaust pipe assembles are not the same lengths?

Keith
I doubt it.

I think primary tube length is where it really matters so that two pulses of exhaust gas aren't fighting over the same space in the exhaust pipes.
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Old 11-16-2007, 07:06 AM
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Malc-thanks...I did some reading over there yesterday

Flip-I love the no fear spirit of many of us here..
Enjoyed seeing your headers.

Keith
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Old 11-19-2007, 12:43 PM
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Home built headers?

Here is the set built for my Monza.

Bob
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Old 11-25-2007, 09:30 PM
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I forgot to post a pic of what the bed of snakes look like in the truck.





Close up of driver side routing (damn my welds look ugly....it was my first attempt at gas welding)
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Old 11-25-2007, 11:26 PM
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Nice effort, but you really should have laid down a few "miles" of weld practising first on scrap.
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