----- Original Message -----
Sent: Friday, April 15, 2005 8:23 PM
Subject: Re: Honda Civic SI Concept Information
Detonation (self-ignition) is the problem there. It isn't an issue in the
diesel cycle because the fuel isn't introduced until the compression has
heated the air charge to the ignition point.
That difference also accounts for the difference in theoretical limit of
efficiency. The otto cycle adds heat at constant volume (less true at higher
rpms than lower rpms, naturally), while the diesel cycle is deemed to add
heat at constant pressure.
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