Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site terak.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!hao!noao!terak!doug From: doug@terak.UUCP (Doug Pardee) Newsgroups: net.auto Subject: Re: Diesel efficiency Message-ID: <436@terak.UUCP> Date: Sun, 10-Mar-85 18:40:41 EST Article-I.D.: terak.436 Posted: Sun Mar 10 18:40:41 1985 Date-Received: Tue, 12-Mar-85 21:09:30 EST References: <216@cmu-ri-leg.ARPA> Organization: Terak Corporation, Scottsdale, AZ, USA Lines: 13 > Why does a diesel give better m.p.g. than a gasoline car. Is it because the > effieciency is greater because of the higher compression ratio or because > diesel fuel gives out more energy when burnt? My (admittedly unknowledgable) beliefs are: 1) The Diesel cycle is slightly more efficient than the Otto cycle in "normal" designs; 2) Most Diesel engines are lower-powered than the gasoline engines they're compared to; 3) Gasoline engines are hampered by emission regulations from which Diesels are exempt. -- Doug Pardee -- Terak Corp. -- !{hao,ihnp4,decvax}!noao!terak!doug