Header design

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The majority of torque "lost" from the bottom end of the power band has actually been moved upwards in the powerband, into the midrange. This can help performance during highway driving and towing, and may provide better passing power when needed. A more powerful midrange tends to make the low end seem less powerful, simply because the engine pulls better in a different part of the RPM range. Most people that think they lost low end power are simply noticing that the engine pulls better in a different way, even if NO low end power was ever lost.
 
The majority of torque "lost" from the bottom end of the power band has actually been moved upwards in the powerband, into the midrange. This can help performance during highway driving and towing, and may provide better passing power when needed. A more powerful midrange tends to make the low end seem less powerful, simply because the engine pulls better in a different part of the RPM range. Most people that think they lost low end power are simply noticing that the engine pulls better in a different way, even if NO low end power was ever lost.
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==Summary of header design principles==
 
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#A "shortie" or a "block hugger" header flows better than a stock manifold in most cases, and helps to produce more power than a stock manifold. However, it is not technically considered a header. They are easier to install than long tube headers in many cases, especially in late model vehicles, which makes them attractive.
 
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#Bigger diameter primary tubes are NOT better in most street applications.
 
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#The torque/power boost available from any header will occur over a specific RPM range. This is accentuated when using equal length headers; they tend to have a higher peak at the cost of average power/power under the curve, or the ''width'' of the powerband. Equal primary tube length is important for maximum power output, but not to the point of obsessing over it. A regular Tri-Y or 4 into 1 header will work better than the stock manifolds. Unequal length headers are a good compromise for a street driven vehicle in many cases; after all, engine design is a compromise.
 
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#A long and smooth collector with a moderate diameter will tend to favor the bottom end, conversely a short, large collector tends to favor the upper range.
 
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#Just like header tube size, be reasonable with the size of your exhaust system. Just do not undersize the system. If you're going to err, err on the larger side.
 
  
 
==180 degree exhaust system==
 
==180 degree exhaust system==
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*Wikipedia article on [http://en.wikipedia.org/wiki/Manifold_%28automotive_engineering%29 exhaust manifolds]
 
*Wikipedia article on [http://en.wikipedia.org/wiki/Manifold_%28automotive_engineering%29 exhaust manifolds]
 
*[[Headers]]
 
*[[Headers]]
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* http://www.wallaceracing.com/header_length.php
  
 
[[Category:Engine]]
 
[[Category:Engine]]

Latest revision as of 15:46, 5 May 2022

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