That and as Calvin has pointed out, for packaging reasons, 180* are out of favor due to the primaries being way too long. For a lower rpm deal, they can make sense. Maybe if the exhaust ports were in the interior of the valley, they could work.
Here is a set of Elston headers for a SBF and a first gen Mustang chassis. 1.623” off the head and they make over 600bhp.
Formula One teams have known the difference between the single cylinder engine and mutlicylinder on the exhaust side for a long while. I’ve cited the Honda white paper numerous times discussing this.
Header Theory by Vince Roman from Burns @ PRI
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Re: Header Theory by Vince Roman from Burns @ PRI
The benefits of not having to weave the system through a stock chassis are obvious.
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Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
Re: Header Theory by Vince Roman from Burns @ PRI
Exhaust art mixed with physics. I love it and thanks for the pics.
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Re: Header Theory by Vince Roman from Burns @ PRI
Something Calvin does, and can be observed if you look at his (and other high end headers) is seperate flange for each port. That way you can install the header in a sequence and are able to fit tubes into an area that you couldn’t with a common flange.
-Bob
Re: Header Theory by Vince Roman from Burns @ PRI
Yes, that's the case with the system in my pic; the primaries all install separately, then the one piece secondaries/collectors are slip-fitted.
Felix, qui potuit rerum cognscere causas.
Happy is he who can discover the cause of things.
Happy is he who can discover the cause of things.
Re: Header Theory by Vince Roman from Burns @ PRI
Me, too! And my headers were only like $400.hoffman900 wrote: ↑Mon Dec 10, 2018 4:28 pm Something Calvin does, and can be observed if you look at his (and other high end headers) is seperate flange for each port. That way you can install the header in a sequence and are able to fit tubes into an area that you couldn’t with a common flange.
paulie
Re: Header Theory by Vince Roman from Burns @ PRI
Now if only header manufactures could grasp this... It amazes many how many headers don't fit the chassis they were designed for.
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Re: Header Theory by Vince Roman from Burns @ PRI
The reverse meg inside the collector is the way to go, IMO. Acts like a A/R collector
-Bob
Re: Header Theory by Vince Roman from Burns @ PRI
Most header manufacturers are paying attention to three or four things when they build and sell header systems.
1. How much will the customers pay for that set of headers? (Marketing)
2. How can they be produced as inexpensively as possible and still offer some measure of value? (Cost Controls)
3. What materials and particular sizes, components and construction methods are required? (Manufacturing factors)
4. What shape do they need to be to fit the customers engine and chassis.( Application costs)
Unless the header user is willing to purchase his headers optimized in all areas and maximized performance and not be bound by chassis and frame restrictions and have cost as a non-factor most headers built and supplied to most aftermarket performance uses are not going to be the ultimate size, shape , materials or performance characteristics.
Seems as though the answer is you determine a budget and cost range and then select the best possible compromise from a standpoint of optimized tube length, bends, pipe and collector lengths, shapes and sizes and materials that will fit the frame and chassis and hopefully deliver the best power and torque outputs they can provide to the engine. It's kind of like Horseshoes, you can hopefully get close to the best ultimate header, but most of the time it's hopefully going to end up close but not perfect!
Alas, sounds alot like the hopeful best in life in general!
1. How much will the customers pay for that set of headers? (Marketing)
2. How can they be produced as inexpensively as possible and still offer some measure of value? (Cost Controls)
3. What materials and particular sizes, components and construction methods are required? (Manufacturing factors)
4. What shape do they need to be to fit the customers engine and chassis.( Application costs)
Unless the header user is willing to purchase his headers optimized in all areas and maximized performance and not be bound by chassis and frame restrictions and have cost as a non-factor most headers built and supplied to most aftermarket performance uses are not going to be the ultimate size, shape , materials or performance characteristics.
Seems as though the answer is you determine a budget and cost range and then select the best possible compromise from a standpoint of optimized tube length, bends, pipe and collector lengths, shapes and sizes and materials that will fit the frame and chassis and hopefully deliver the best power and torque outputs they can provide to the engine. It's kind of like Horseshoes, you can hopefully get close to the best ultimate header, but most of the time it's hopefully going to end up close but not perfect!
Alas, sounds alot like the hopeful best in life in general!
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