Republic of the Philippines
PHILIPPINE STATE COLLEGE OF AERONAUTICS
Piccio Garden, Villamor, Pasay City
Institute of Engineering and Technology BSAeE
AE 315 (LEC/LAB) – Powerplant I
MODULE NO.1
CASE STUDY NO. 2
Alao, Alexis Gene Q.
BSAeE 3-1
Engr. Roy Tristan S. Rosales
Instructor
RATING:
Honesty Clause
As an institution of higher learning, students are expected to display highest degree of honesty and
professionalism in their class work, requirements, and activities; thus, in no case that cheating – or any
form of it, may it be plagiarism, copying other students’ works, and fabrication of materials – shall be
tolerated. The college assumes as a simple and minimal preferred of habits in academic matters that
students be truthful and that they publish for deposit solely the merchandise of their personal efforts.
ALAO, ALEXIS GENE Q.
Signature Over Printed Name
Name: Alao, Alexis Gene Q.
Title: History and Development of Reciprocating
Engines
Instructor: Engr. Roy Tristan S. Rosales
Date: November 1, 2022 Case Study: 2
Signature:
Page: 2 of 5
A. Perform a case study or research about the DIFFERENT design perspectives of the
Lycoming and Continental aircraft reciprocating engines.
Aircraft Engines that are used in general aviations are usually Lycoming or Continental
Engines. Both of these companies produce engines that share similarities and differences in
regards to their designs.
One major design difference is the positioning of the camshaft, for Lycoming, it is
located above the crankshaft while on the Continental, it is located below the crankshaft.
According to Gujjari (2015), Continental Engines number their cylinders from the back to the
front while Lycoming numbers them from the front to the back. Continental Engines also tend
to cost more with parts being more expensive than the Lycoming counterpart.
The Carburetor which is used for mixing air and fuel together is attached to the oil
slump in a Lycoming Engine. The heat of the oil makes it so that the carburetor does
experience carburetor icing. In a Continental Engine, the Carburetor is located in a separate
intake maniforld which means that it does not prevent Carburetor Icing.
Lycoming and Continental excels in different horsepower engines in the market.
Lycoming has engines in the 150-200 horsepower range while they lack in the 125 and 250
horsepower range. Continental has engines that excel in the 125 and 250 horsepower range.
In the end, they compete within the same playing field and dishes out designs that are
systematically similar. However, tests show that Continental tends to wear out their cylinders
faster than Lycoming Engines
These are some of the differences between a Lycoming and Continental Engine design
that can be pointed out when mentioning notable qualities between the two despite being
very similar to each other.
Name: Alao, Alexis Gene Q.
Title: History and Development of Reciprocating
Engines
Instructor: Engr. Roy Tristan S. Rosales
Date: November 1, 2022 Case Study: 2
Signature:
Page: 3 of 5
B. Cite the advantage & disadvantage of Spark Ignition and Compression Ignition
Engine
Type
Compression
Ignition
Engine
Spark
Ignition
Engine
Advantages
Disadvantages
Can Produce more power
Relatively Heavier
Is efficient in fuel consumption
Much more Expensive than petrol
engines
Diesel is much more energy
dense than Petrol
Has a tendency to produce more
vibration
Has higher Thermodynamic
Efficiency
More environmental impact
Has Higher Volumetric Efficiency
Harder to Maintain
Lighter in Weight
Consumes more fuel
High Speed Engines
Less Thermal Efficient
Cheaper than Compression
Engines
Produces less power
Produces less noise and vibration
Petrol is not as power-dense as
diesel
Easier to Maintain
Less economical than CI Engine
Name: Alao, Alexis Gene Q.
Title: History and Development of Reciprocating
Engines
Instructor: Engr. Roy Tristan S. Rosales
Date: November 1, 2022 Case Study: 2
Signature:
Page: 4 of 5
B. Cite the advantage & disadvantage of Two Stroke and Four Stroke Cycle
Type
Two Stroke
Cycle
Four Stroke
Cycle
Advantages
Disadvantages
Can output more power with
twice the number of power
strokes
Has the tendency to waste fuel
and disturb the cycle
Generally lighter engine design
Thermal Efficiency is less than
that of a Four Stroke Cycle
Cheaper
Has a relatively high oil
consumption
Easier Maintenance with fewer
parts
Much more pollution produced
Flexible in positioning
Less fuel efficient
More torque in lower RPM
More moving and complicated
parts
Much more fuel efficient
Much more expensive
Less pollution with less burning of
oil
Difficult to maintain
Can withstand more usage
Less power at higher RPM
Saves oil compared to Two
Stroke
Heavier than a two-stroke engine
Name: Alao, Alexis Gene Q.
Title: History and Development of Reciprocating
Engines
Instructor: Engr. Roy Tristan S. Rosales
Date: November 1, 2022 Case Study: 2
Signature:
Page: 5 of 5
References:
Difference between SI (Spark ignition) and CI (Compression ignition) engines. (2020, October 30).
Student Lesson. https://studentlesson.com/difference-between-si-and-ci-engine/
R.Eng, (.M.U.C.C.). (2018, January 3). Spark ignition VS compression ignition engines.
https://www.linkedin.com/pulse/spark-ignition-vs-compression-engines-chikwado-ugwu/
CI Engine: Working, Application, Advantages and Disadvantages. (2022, August 23). Mech4study.
https://www.mech4study.com/automobile/ci-engine-working-application-advantages-anddisadvantages.html/
What are the differences between Lycoming and Continental engine designs? (2014, January 23).
Aviation Stack Exchange. https://aviation.stackexchange.com/questions/1256/what-are-thedifferences-between-lycoming-and-continental-engine-designs
Knowledge - “Differences, Advantages & Disadvantages of 4 stroke vs 2 stroke engine.” (n.d.).
Viden.io. Retrieved November 3, 2022, from https://viden.io/knowledge/differences-advantagesdisadvantages-of-4-stroke-vs-2-stroke-engine
Baviskar, J. (2019, February 3). Differences, Advantages & Disadvantages of 4 stroke vs 2 stroke
engine –. MechStuff. https://mechstuff.com/differences-advantages-disadvantages-of-4-stroke-2stroke-engine/
What is the difference between Lycoming and Continental engines? (n.d.). Quora. Retrieved
November 3, 2022, from https://www.quora.com/What-is-the-difference-between-Lycoming-andContinental-engines