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Page Title: What are the differences between otto cycle and diesel cycle? - Answers
Page Description: Mister Rudolph Diesel was aware of the gasoline engine
([https://en.wikipedia.org/wiki/Otto_cycle Otto cycle]) problems and
wanted to improve it. The gasoline engine inherently has problems
with efficiency and/or fuel. In order to improve the efficiency one
must increase the compression ratio of an internal-combustion
engine (see the bonus section at bottom of this article). However,
in the gasoline engine there is a limit - the gasoline-air mixture
will self ignite once the compression gets too high (because every
compression drives temperature increase). So, either you can have a
low-efficient, low-compression engine that uses a cheap fuel, or
you can have a high-efficient, high-compression engine that uses
expensive, high-refined fuel that wont self-ignite even at high
compression levels (a 120 octane gasoline?). In
[https://en.wikipedia.org/wiki/Diesel_engine diesel engine] this
problem is solved. The diesel engine can use much higher
compression levels than the gasoline engine reaching higher
efficiency. In addition, the diesel engine can use fuel that is not
nearly as refined as the high-octane gasoline fuel (thus cheaper).
To make this possible, Rudolph changed the Otto cycle and created
the diesel cycle. The difference is that during compression phase,
no fuel is present in the cylinder and thus no self-ignition can
happen. The fuel is only injected at the moment the ignition is
wanted - when injected into the hot pressurized air the diesel fuel
self-ignites immediately (the diesel-air mixture, as we said
already, is happy to ignite even at relatively low
temperatures).
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