Single cylinder engine design and optimization

ESTECO Academy has partnered with Aprilia Racing and Gamma Technologies to sponsor the design and optimization of a single-cylinder, four-stroke, 250cc engine. The aim of this project is to utilize modeFRONTIER and GT-Suite in numerically analyzing, simulating, and testing to create the ideal race engine.

Background
Grand Prix motorcycle racing is the premier championship of motorcycle road racing, which is divided into three classes: Moto3, Moto2 and MotoGP. Moto3 replaced the 125cc class in 2012. Moto3 runs 250cc single-cylinder engines as opposed to the 125cc engines used previously. Moto GP has been the testbed for many different new engine technologies including finger follower valvetrains, and air valve-springs

Deliverables
The deliverables for the competition include an optimized airbox volume, intake runner, exhaust runner, exhaust pipe length, throttle valve diameter, and valvetrain timing.

Specifications
Displacement: 250cc Cylinder bore = 81 mm  Stroke = 48.5 mm Rev limit 17,500 Conrod length L = 105 mm Inlet Valve Diameter <=34.5 mm (2x) Exhaust Valve Diameter <= 27 mm (2x)  RPM max 17500 1/min Compression Ratio<= 15.8 (compression rate)</li> Valve Cams timing fixed - NOT variable</li> Natural aspiration</li>

Combustion Program (early design development)
We have been using the combustion program written by........... to start early design analysis for the specifications that we were given to us by ESTECO academy. We started by simply inputting our given conditions and running the program, to begin our design we were only curious about the amount of peak torque expected, variable: T_indicated. With out optimization our expected torque is shown below: the table includes values to be optimized.

Rendering using Rhinoceros 3D and Flamingo nxt
We have been utilizing Rhinoceros 3D and Flamingo nxt to develop photo-realistic renders of an example piston from previous work at the University of Idaho. We are planning to create renders of our final piston and connecting rod designs as well as full renders of our final engine design.

Each of these renders are the result of initial experimentation in Rhinoceros. The metal texture that is applied to these pistons is uniform throughout and is not accurate to forged pistons. The next step of creating photo-realistic renders is to utilize textures that accurately replicate the surface appearances of actual pistons. The SolidWorks file of the piston is from Jason Stirpe's, an alumni of University of Idaho, YZ250 piston file with edited valve ports on the top. The file was a model of a piston created from metrology of the stock piston in a YZ250 engine, but it had unrealistic valve ports and no piston rings. Each of the renders is a result of manipulation in view and lighting and further advances in realism will result in further experimentation with surface textures, lighting and camera position.

reserved for text
reserved for text

Overview
Reserved for purpose if we find one.

Document Archive
Reserved for Docs