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Ignition Systems

Ignition Systems . Fuel. Understand the types of fuels Understand emission ratings . Objectives . Refined crude oil Ignition systems don require an explosion but a wall of flame pushing down the piston Normal Combustion Ignited fuel spreads evenly across the cylinder . Gasoline .

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Ignition Systems

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  1. Ignition Systems Fuel

  2. Understand the types of fuels • Understand emission ratings Objectives

  3. Refined crude oil • Ignition systems don require an explosion but a wall of flame pushing down the piston • Normal Combustion • Ignited fuel spreads evenly across the cylinder Gasoline

  4. Preignition • Carbon deposits get too hot and ignite fuel early • This is the same as the spark plug getting too hot • Can cause a knocking sound and have the engine running rough Gasoline

  5. Detonation • Explosion in the chamber instead of a wall of flame • Also ping or spark knock • Part of the mixture ignites too fast then when the other part ignites on time cases an explosion • Causes pressure that damages spark plugs and pistons • Caused by too much heat or a lean mixture (more air than fuel) Gasoline

  6. Gasoline adds chemical to prevent detonation • Called Antiknock Quality • Octane Number • How well gasoline prevents detonation • Octane requirements are displayed in owners manuals of all engines Gasoline

  7. A Older antiknock methods is adding tetraethyl lead • Leaded Fuel • Leaded fuels are not sold anymore and lead additives are added to unleaded gasoline Gasoline

  8. Gasoline stored over time becomes stale • Picks up water • Stale fuel can cause fuel gum that clogs fuel lines • Called varnish • It is recommended to only store a 30 day supply of fuel to prevent water buildup • Sore in a cool ventilated area • Engine if not in use should have a tan empty or full Gasoline Storage

  9. Blend of gasoline and grain alcohol • 90% Gas, 10% Alcohol • If alcohol is at a high concentration it will eat through gaskets and seals • Other issues • Corrosion of metals • Added water to combustion chamber causing overheating Gasohol

  10. Liquid Petroleum gas • Under pressure as liquid but released as a gas • Clean emissions • Has bulky storage and smaller amount of options to fill it • Used on forklifts LP

  11. There is no regulation on emissions on small engines • Major producer of smog in the US • A lawnmower running for 30m min produced the same emissions as a new car driving 173 miles • A 2 stroke chainsaw running 2 hrs is equivalent to a car driving coast to coast Emissions

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