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State whether following statement is true or false and justify: Specific fuel consumption for supercharged SI engine is more than naturally aspirated SI engine.

written 8.5 years ago by teamques10 ★ 68k

•   modified 5.2 years ago

ic engines

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written 8.5 years ago by teamques10 ★ 68k

• The statement is true. Supercharging results in increase of intake temperature of engine. The increased intake temperature and pressure reduces ignition delay and increases flame speed. The result is greater tendency to detonate.
• This effect leads to use of lower compression ratios for supercharged SI engines. Therefore these low compression ratios along with increased heat losses (due to higher specific heats and dissociation losses at higher temperatures) consequently result in lower thermal efficiencies for such engines.
• Thus supercharged SI engines have greater specific fuel consumption than naturally aspirated engines.

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