Informative Research Product Organizer Research Topic: Supercharger VS. Turbocharger Bryan Doyle Focusing Statement: my focusing statement is that the different types of forced induction and when to use them depending on your application Essential Background Information for Introduction: The background: first you have to understand how an engine works to understand the benefits of forced induction. After you understand how an engine works you can understand that an engine is nothing more than an air pump and the more air and fuel you can put in the more power you can get out. The more air and fuel you can get in without using forced induction or larger displacement the more efficient and engine is going to be. When adding turbos (driven by exhaust gases) you can force more air and fuel in to an engine creating more power. Same goes for a supercharger (driven by engines crankshaft) you can force more air and fuel in and create more power without lag. Potential Hook/Grabber (Story, anecdote, quote about your issue): when it comes to performance you can sometimes double your power output by adding some kind of forced induction(turbo/supercharger) Topic 1: How does an engine work Explanation Evidence/Quotes: An engine is an air pump that burns air and fuel in A typical car engine is a four stroke engine it has a intake stroke which order to create rotating power brings air and fuel into an engine a compression stroke which compresses the air and fuel then a power stroke when the air and fuel is ignited creating power and an exhaust stroke that pushes exhaust gases out Explanation Evidence/Quotes: Engines go through a cycle and on a four stroke it is 1 full rotation of a crankshaft will give you 2 strokes because the engine intake compression power and exhaust which takes goes from TDC (top dead center) to BDC (bottom dead center) is one 720 degrees rotation of the crankshaft to complete stroke and only half a turn of the crankshaft Explanation Evidence /Quotes: Engine efficiency An engine is restricted by the amount of air and fuel it can take in and out engine performance and efficiency is controlled by the amount of air and fuel being put in to the engine and the compression ratio which is the difference between how much air is at (BDC) compared to at (TDC) which can change the power output Topic 2: Forced induction Explanation Evidence/Quotes: superchargers Superchargers use the drive from the crankshaft to spin some kind of device to force air into an engine to create more power and efficiency Explanation Evidence/Quotes: turbochargers A turbo uses exhaust gases to spin a turbine at high speeds to spin a compressor that forces air in to the engine Explanation Evidence /Quotes: One common goal The common goal of both superchargers and turbos is to force more air in to an engine in order to create more power at the crankshaft. When building an engine with boost you need to have lower compression ratio to accommodate the added air pressure in the cylinders which adds to the static compression ratio for every pound of boost added Topic 3: Turbos Explanation Evidence/Quotes: How it works there are two sections to a turbo, a turbine side and a compressor side the turbine is spun by the exhaust gases and spins a shaft connected to the compressor and does exactly what it sounds like it compresses air and forces it in to the engine. Explanation Evidence/Quotes: How performance is added average turbo has about 6 to 8 PSI from the turbo and at sea level air pressure is about 14.7 PSI and in theory that is about a 50 percent increase but when you compress air it heats up and an engine wants cold air to run better so you only get about a 30 to 40 percent increase Explanation Evidence /Quotes: The disadvantages The disadvantages of a turbo are that the turbo is driven by exhaust gases and creates a lot of heat under the hood and another is that the lag that the turbo has from the time that the turbo needed to spool up to create boost and also since the turbo is exhaust driven it has back pressure in the engine Topic 4: Supercharger Explanation Evidence/Quotes: Types of superchargers 3 main types of supercharging centrifugal, roots, and twin screw centrifugal superchargers make more power at higher RPM because of its design to spin faster to make boost while a roots or twin screw supercharger make more boost at lower RPM Explanation Evidence/Quotes: How they work A supercharger is usually mounted on top of an engine or on the front. The supercharger is driven by the engines crankshaft to spin the impeller to make boost pressure Explanation Evidence /Quotes: Advantages and disadvantages The disadvantages of a supercharger are it takes about 20percent of an engines power to spin a supercharger but it can make 30 to 50 percent more power. The advantage is that the supercharger is driven by the crankshaft and has no lag Topic 5: What to chose Explanation Evidence/Quotes: installation Superchargers are easier to install because they require less or no plumbing to the engine. Turbos that have plumbing for the exhaust, waste gate, intercooler, intake, and oil and coolant lines. Explanation Evidence/Quotes: tuning Once the computer is flashed to read manifold pressure instead of engine vacuum and to add more fuel, superchargers are easier to tune because the only thing to change is pulley sizes to regulate boost. On a turbo you have the waste gate, blow off valve, and turbo sizes to prevent surging of boost or other running problems. Explanation Evidence /Quotes: Efficiency When it comes to efficiency the turbo wins by far because unlike a supercharger it takes no power from the engine to create power WC HowStuffWorks. "How Car Engines Work." www.howstuffworks.com. Discovery, n.d. Web. 10 Oct. 2011. <http://auto.howstuffworks.com/engine1.htm>. How to Calculate Compression Ratio." Car Craft. N.p., Feb. 2009. Web. 18 Oct. 2011. <http://www.carcraft.com/techarticles/calculate_compression_ratio/index.html>. Harris, William "How Superchargers Work" 24 january 2006. howstuffworks.com <http://www.howstuffworks.com/supercharger.htm> 13 October 2011 Nice,Karim. "How Turbochargers Work" 04 December 2000. Howstuffworks.com. http://auto.howstuffworks.com/turbo.htm 13 October 2011 Superchargersonline. "Supercharger Tech Turbo Vs. Supercharger." Superchargers Online. N.p., 4 Apr. 2002. Web. 26 Oct. 2011. <http://www.superchargersonline.com/content.asp?ID=19>. Garrett Turbos. "Turbo Optimization." Turbo by Garrett. N.p., n.d. Web. 20 Oct. 2011. http://www.turbobygarrett.com/turbobygarrett/tech_center/turbo_optimization.html Paxton Superchargers. Paxton Superchargers. N.p., n.d. Web. 21 Oct. 2011. <http://www.paxtonauto.com/article.php?id=152#q23>. Turbo Systems 102." Turbos by Garrett. N.p., n.d. Web. 19 Oct. 2011. <http://www.turbobygarrett.com/turbobygarrett/tech_center/ turbo_tech102.html#d>. Superchargersonline. "Supercharger Tech Turbo Vs. Supercharger." Superchargers Online. N.p., 4 Apr. 2002. Web. 26 Oct. 2011. <http://www.superchargersonline.com/content.asp?ID=19>.
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