Indirect Injection - Disadvantages

Disadvantages

• Specific fuel consumption is high because of heat loss due to large exposed areas and pressure loss due to air motion through the throats.
• Glowplugs are needed for a cold engine start.
• Because the heat and pressure of combustion is applied to one specific point on the piston as it exits the precombustion chamber or swirl chamber, such engines are less suited to high specific power outputs (such as turbocharging or tuning) than direct injection diesels. The increased temperature and pressure on one part of the piston crown causes uneven expansion which can lead to cracking, distortion or other damage.