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SVTPerformance's Chain of Restaurants
Road Side Pub
Pop quiz: Why do boosted engines need a more powerful spark?
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<blockquote data-quote="James Snover" data-source="post: 16195092" data-attributes="member: 67454"><p>Bonus question:</p><p></p><p>On the compression stroke, combustion occurs*, the piston is approaching TDC, and both valves are closed. Temperatures and pressures are at the very highest. But the amount of power the engine is making is ... almost nothing. In fact, at that point the power the engine is making is so low, despite temps and pressures through the roof, that if it were left to itself, the piston would run backwards down the bore.</p><p></p><p>1.) How can it be the engine is making almost no power at this point when the process on which it derives power, is at its absolute peak?</p><p></p><p>2.) And ... considering that, what lets it run, at all?</p><p></p><p>* because having read the preceding post, you were smart enough to design your ignition around a discarded lithotripter capacitor. You have no trunk space, and it scares dogs and attracts lightning, but you do not lose races for failure to ignite!</p></blockquote><p></p>
[QUOTE="James Snover, post: 16195092, member: 67454"] Bonus question: On the compression stroke, combustion occurs*, the piston is approaching TDC, and both valves are closed. Temperatures and pressures are at the very highest. But the amount of power the engine is making is ... almost nothing. In fact, at that point the power the engine is making is so low, despite temps and pressures through the roof, that if it were left to itself, the piston would run backwards down the bore. 1.) How can it be the engine is making almost no power at this point when the process on which it derives power, is at its absolute peak? 2.) And ... considering that, what lets it run, at all? * because having read the preceding post, you were smart enough to design your ignition around a discarded lithotripter capacitor. You have no trunk space, and it scares dogs and attracts lightning, but you do not lose races for failure to ignite! [/QUOTE]
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Pop quiz: Why do boosted engines need a more powerful spark?
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