Advantages Of Wasted Spark Ignition. This system has several advantages, including fewer moving parts and more precise control of spark timing, which can improve engine efficiency, emissions and performance. A standard porsche 944 has a single coil which is timed by the dme to give the correct dwell and ignition advance for the engine conditions.
Wtatwta: What Is Wasted-Spark Ignition, And Do I Want It? - Revzilla from www.revzilla.com
The spark delivered on the exhaust stroke, called a “waste spark” has no effect. A sequential setup will have more time for the coil windings to charge and will have more time between ignition fires to cool over a wasted spark setup witch will fire twice in the same cycle and have half the amount of time to cool down. If however the intake valve is open enough during wasted spark ignition that air and fuel reach the immediate vicinity of the spark plug, you run the risk of preignition which can lead to premature engine.
In A Wasted Spark System, The Spark Plugs Fire In Pairs Even Though One Is On Its Compression Stroke And One Is On Its Exhaust Stroke.
Wasted spark with double ended single coil, one plug is always reverse polarity, erodes the electrode quicker. #3 kieran_e1, nov 13, 2010. Quite hard to get to get matched coils that can be put in parallel to produce equal sparks.
The Spark Delivered On The Exhaust Stroke, Called A “Waste Spark” Has No Effect.
The extra spark on the exhaust stroke has no effect and is thus wasted. This system has several advantages, including fewer moving parts and more precise control of spark timing, which can improve engine efficiency, emissions and performance. It's designed to burn off any excess gasses on the extra spark for a more effecient process.
A Sequential Setup Will Have More Time For The Coil Windings To Charge And Will Have More Time Between Ignition Fires To Cool Over A Wasted Spark Setup Witch Will Fire Twice In The Same Cycle And Have Half The Amount Of Time To Cool Down.
The wasted refers to the extra spark. There is also no pressure and the spark uses minimal power to jump across the electrode of the sparkplug on the cylinder the wasted spark is firing so there isn't much power lost for the other spark. In a wasted spark ignition systems there are two spark plugs connected to the ends of one coil ( for 2 cylinder engine )( for 4 cylinder engine two coils are used, each driving two spark plugs ).
There Are Two Main Drawbacks With This System.
In other applications, we are able to retain the distributor for classic appearance or functional reasons, but use the ecu to control the ignition advance curve and/or provide a The spark is distributed to the correct cylinder by the use of a distributor driven from the camshaft. Wasted spark ignition coils are also able to charge very quickly ensuring that a strong spark is present even at very high rpm figures.
Less Wear Parts, No Dizzy, Rotors Etc.
Both spark plugs will therefore fire simultaneously. The extra spark on the exhaust stroke has no effect and is thus wasted. Forum » efi tuning fundamentals » running sequential injection but wasted spark ignition.
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