skav said:
What makes the Whipple/screw more efficient than a roots straight lobe? Is it just a newer, better design? Both are available with intercoolers so heat shouldn't be an issue. Would it be correct to call a roots setup "old school"?
I get the whole efi computer deal. My Whipple and mefi is super mellow-if that's the right way to describe it.
It always fires right up and idles at 850 with no surge.
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Screw Superchargers are actually an air compressor which is more adiabatic efficient than a Roots Supercharger. A Roots supercharger, which most originated from a 2 stroke diesel engine, typically a Detroit ie; 8-71 (8 cylinder, 71 cubic inches per cylinder). Centrifugal superchargers are kind of a cross breed between turbos and Screw or Roots Superchargers. All of these are mechanically driven.
Turbo Chargers work primarily on the Radiant Heat/Expansion of exhaust gases not so much exhaust pressure or back pressure. In a Diesel engine they work perfectly. However with a gasoline engine they can cause a snowball effect once the engine fuel/air ratio goes lean as it will case more radiant exhaust heat which will spool the turbo to make more boost which will only further lean the engine, and so on.
All types of supercharging used to increase the volumetric efficiency of the engine which will raise the power output or Brake Means Effective Pressure.
Here are a couple of links that you should find interesting. All of them are pretty basic and short reads but will give you a better understanding of what you are asking about.
Hope this helps.
http://www.superchargersonline.com/index.php?main_page=page&id=12
https://en.wikipedia.org/wiki/Turbocharger
http://kennebell.net/KBWebsite/Common/pdfs/SC_efficiency.pdf
Screw Superchargers are actually an air compressor which is more adiabatic efficient than a Roots Supercharger. A Roots supercharger, which most originated from a 2 stroke diesel engine, typically a Detroit ie; 8-71 (8 cylinder, 71 cubic inches per cylinder). Centrifugal superchargers are kind of a cross breed between turbos and Screw or Roots Superchargers. All of these are mechanically driven.Turbo Chargers work primarily on the Radiant Heat/Expansion of exhaust gases not so much exhaust pressure or back pressure. In a Diesel engine they work perfectly. However with a gasoline engine they can cause a snowball effect once the engine fuel/air ratio goes lean as it will case more radiant exhaust heat which will spool the turbo to make more boost which will only further lean the engine, and so on.All types of supercharging used to increase the volumetric efficiency of the engine which will raise the power output or Brake Means Effective Pressure.Here are a couple of links that you should find interesting. All of them are pretty basic and short reads but will give you a better understanding of what you are asking about.Hope this helps.
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