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What is the efficiency of the engine if it operates in an idealized Otto cycle?

May 13, 2010 by Adelaide | Posted in Physics

A gasoline engine has a compression ratio of 5.00 and uses a gas for which Оі = 1.40.
(a) What is the efficiency of the engine if it operates in an idealized Otto cycle?
%

If the actual efficiency is 19.0%, what fraction

For the Otto cycle e = 1 - 1/r^(Оі-1)

= 1 - 1/5.0^(1.4 -1) = 0.475 = 47.5%

Assuming the same work

we have e*Qh)ideal = e*Qh actual

But Qh = m*Lc (Lc is the heat of combustion)

Now

DH | May 13, 2010

How a Car Engine Works (Internal Combustion Engine)

Four-stroke cycle (or Otto cycle) shown. en.wikipedia.org

The Otto Cycle in a Four Stroke Engine

The Otto Cycle in a Four Stroke Engine phys23p.sl.psu.edu

Mr. Bailey explains the OTTO cycle

BCIT AME 'M" students require a working knowledge of piston engine technologies. In this 6-minute clip, Mr. Ross Bailey (instructor) will ...