Re: Glowplugs in diesel tractors...

Posted by DR Cy Kosis on May 30, 2004 at 06:42:27 from (65.174.44.118):

In Reply to: Glowplugs in diesel tractors... posted by Jeremy Cope on May 29, 2004 at 23:38:55:

Direct Injection Diesels do not need glow plugs to start even in the cold. Indirect injection diesels have to have them to assist in a cold start because of the higher surface to volume ratio of the split combustion chamber drawing the heat of compression out of the air in the cylinder. Indirect injection diesels tend to be of higher compression ratio (20:1 to 23:1) for this reason also to provide unaided cold starting ability. The much lower surface to volume ratio of the direct injection engine combustion chambers alows them to start unaided at lower temperatures with lower compression ratios (16:1 to 18:1). Most of the time the mere presence of glow plugs tells you that you are looking at a indirect injection engine.

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