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Magneto IgnitionMagneto Ignition

SystemsSystems

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Table of ContentsTable of Contents

          I. Introduction to Magneto Ignition SystemsI. Introduction to Magneto Ignition Systems What are Magneto Ignition Systems?What are Magneto Ignition Systems?

What are the different uses for the Systems?What are the different uses for the Systems?

          II. Different Types of SystemsII. Different Types of Systems MBIMBI

CDICDI

TCITCI

          III. SummaryIII. Summary          IV. Review QuestionsIV. Review Questions

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What are Magneto IgnitionWhat are Magneto Ignition

Systems?Systems?          The purpose of an ignition system is toThe purpose of an ignition system is to

provide sufficient electrical voltage toprovide sufficient electrical voltage to

discharge a spark plug at precisely thedischarge a spark plug at precisely theright time to ignite highly compressed air right time to ignite highly compressed air--

fuel mixture.fuel mixture.

          Magneto Ignition systems provide currentMagneto Ignition systems provide current

for ignition without any outside primaryfor ignition without any outside primary

source of electricity.source of electricity.

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Different UsesDifferent Uses

          The primary uses for Magneto IgnitionThe primary uses for Magneto Ignition

systems are in small gasoline poweredsystems are in small gasoline powered

engines such as lawn mowers.engines such as lawn mowers.

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Different TypesDifferent Types

          MBIMBI ± ± Mechanical Breaker Point IgnitionMechanical Breaker Point Ignition

          CDICDI ± ± Capacitive Discharge IgnitionCapacitive Discharge Ignition

          TCITCI ± ± Transistor Controller IgnitionTransistor Controller Ignition

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Mechanical Breaker Point IgnitionMechanical Breaker Point Ignition

          One of the types of ignition systems, theOne of the types of ignition systems, the

MBI system uses a Condenser to preventMBI system uses a Condenser to prevent

current from arcing across the breaker current from arcing across the breaker point gap as the points open.point gap as the points open.

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 Advantages to MBI Advantages to MBI

          MBI does not require a primary source of MBI does not require a primary source of 

electricity in order to produce ignition inelectricity in order to produce ignition in

the engine.the engine.          Through the use of the Flywheel and theThrough the use of the Flywheel and the

condenser, a continuous current iscondenser, a continuous current is

generated and can be easily broken for generated and can be easily broken for 

stopping purposes by use of thestopping purposes by use of thecondenser.condenser.

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MBI in UseMBI in Use

Image courtesy of http://web.telia.com/~u85306919/1912.jpg

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Capacitive Discharge IgnitionCapacitive Discharge Ignition

          CDI is a solid state ignition system, it is one of theCDI is a solid state ignition system, it is one of the

newest ignition systems used today.newest ignition systems used today.

          CDI is breakerless and the moving mechanical parts areCDI is breakerless and the moving mechanical parts are

replaced with electronic components.replaced with electronic components.          The only moving parts are the magnets attached to theThe only moving parts are the magnets attached to the

Flywheel.Flywheel.

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 Advantages to CDI Advantages to CDI

          CDI is very easy to troubleshoot, byCDI is very easy to troubleshoot, by

turning the flywheel and watching theturning the flywheel and watching the

sparkplug gap for a spark.sparkplug gap for a spark.

          CDI is compact and maintenance freeCDI is compact and maintenance free

since the only moving parts are thesince the only moving parts are the

flywheel magnets.flywheel magnets.

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CDI in UseCDI in Use

Image courtesy of www.dansworkshop.com

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Transistor Controller IgnitionTransistor Controller Ignition

          As the Flywheel magnets rotate they pass by the As the Flywheel magnets rotate they pass by the

ignition coil in the system.ignition coil in the system.

          The magnetic field of the magnets induceThe magnetic field of the magnets induce

current in the primary windings of the ignitioncurrent in the primary windings of the ignitioncoil creating the charge for the spark.coil creating the charge for the spark.

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 Advantages to TCI Advantages to TCI

           As with CDI, the only moving parts are the As with CDI, the only moving parts are the

magnets on the flywheel.magnets on the flywheel.

          T

he timing of T

CI is more precise with theT

he timing of T

CI is more precise with theuse of the Transistors.use of the Transistors.

          Does not use Mechanical Breaker Does not use Mechanical Breaker 

contacts, but utilizes semicontacts, but utilizes semi--conductorsconductors

instead.instead.

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TCI in UseTCI in Use

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SummarySummary

          The primary purpose of the ignition systemThe primary purpose of the ignition systemis to provide sufficient voltage to dischargeis to provide sufficient voltage to dischargea spark plug.a spark plug.

          The three types of Magneto IgnitionThe three types of Magneto Ignitionsystems have advantages over the otherssystems have advantages over the othersbut have different uses for each.but have different uses for each.

          Small engines most prominently useSmall engines most prominently useMagneto Ignition Systems for firing theMagneto Ignition Systems for firing theignition of the engine.ignition of the engine.

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Image courtesy of http://home.howstuffworks.com/how-to-repair-small-engines3.htm

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Review QuestionsReview Questions

          1. Name three components of a CDI1. Name three components of a CDI

system.system.

          

2. What is the main purpose of the2. What is the main purpose of theCondenser?Condenser?

          3. Which of the systems has the least3. Which of the systems has the least

amount of maintenance?amount of maintenance?

          4. In the CDI system, what is the only4. In the CDI system, what is the only

moving part?moving part?

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Review Questions cont.Review Questions cont.

          5. What is the main purpose of an Ignition5. What is the main purpose of an Ignition

System?System?

          

6. What doesT

CI stand for and what6. What doesT

CI stand for and whatmakes it different from the rest?makes it different from the rest?

          7. What is an advantage to using an MBI7. What is an advantage to using an MBI

system?system?

          8. How can you troubleshoot a CDI8. How can you troubleshoot a CDI

system?system?

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ReferencesReferences

           Roth,  Alfred C.Roth,  Alfred C. Small Gas EnginesSmall Gas Engines..

Tinley Park: The GoodheartTinley Park: The Goodheart--WillcoxWillcox

Company, Inc., 2004.Company, Inc., 2004.