final informative researchproductorganizer.docx - Wikispaces by wuzhengqin


									                                     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:

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

Topic 4:

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

       HowStuffWorks. "How Car Engines Work." Discovery, n.d.
        Web. 10 Oct. 2011. <>.

       How to Calculate Compression Ratio." Car Craft. N.p., Feb. 2009. Web. 18 Oct.
        2011. <>.

       Harris, William "How Superchargers Work" 24 january 2006. <> 13 October 2011

       Nice,Karim. "How Turbochargers Work" 04 December 2000. 13 October 2011

       Superchargersonline. "Supercharger Tech Turbo Vs. Supercharger."
        Superchargers Online. N.p., 4 Apr. 2002. Web. 26 Oct. 2011.

       Garrett Turbos. "Turbo Optimization." Turbo by Garrett. N.p., n.d. Web. 20 Oct.

       Paxton Superchargers. Paxton Superchargers. N.p., n.d. Web. 21 Oct. 2011.

       Turbo Systems 102." Turbos by Garrett. N.p., n.d. Web. 19 Oct. 2011.

       Superchargersonline. "Supercharger Tech Turbo Vs. Supercharger."
        Superchargers Online. N.p., 4 Apr. 2002. Web. 26 Oct. 2011.

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