Cox .049 X 2 Cylinder Tee Dee Race Engine Designed and Built by Henry Parohl
This 2-cylinder 2-cycle opposed racing engine is made from aluminum, steel, and brass bar stock. The crankcase is divided into two chambers front to rear creating, in effect, two separate engines sharing one crankshaft and carburetor. The carburetor is placed midway on the intake manifold, which spans both chambers to supply fuel to each individual engine during the intake cycle. The connecting rod journals are 180 degrees apart on the crankshaft and both cylinders fire at the same time. The cylinder displacement is .049 cubic inches X2 making the total displacement .098 cubic inches. It burns methanol and castor oil on glow ignition.
Many small racing engines have lapped pistons and cylinders- a process where the piston and cylinder is machined within millionths of an inch to each other. The close tolerances allow the fuel and oil mixture to create a liquid seal in the cylinder, eliminating the need for piston rings. The decrease in friction without rings allows the engine to turn more freely and much faster. Some of these small engines can reach over 30,000 revolutions per minute.
See More Henry Parohl Engines at: www.flickr.com/photos/15794235@N06/sets/72157634219050453/
See More Two-Cylinder Engines at: www.flickr.com/photos/15794235@N06/sets/72157649352645204/
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit Our Photo Sets at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum
Cox .049 X 2 Cylinder Tee Dee Race Engine Designed and Built by Henry Parohl
This 2-cylinder 2-cycle opposed racing engine is made from aluminum, steel, and brass bar stock. The crankcase is divided into two chambers front to rear creating, in effect, two separate engines sharing one crankshaft and carburetor. The carburetor is placed midway on the intake manifold, which spans both chambers to supply fuel to each individual engine during the intake cycle. The connecting rod journals are 180 degrees apart on the crankshaft and both cylinders fire at the same time. The cylinder displacement is .049 cubic inches X2 making the total displacement .098 cubic inches. It burns methanol and castor oil on glow ignition.
Many small racing engines have lapped pistons and cylinders- a process where the piston and cylinder is machined within millionths of an inch to each other. The close tolerances allow the fuel and oil mixture to create a liquid seal in the cylinder, eliminating the need for piston rings. The decrease in friction without rings allows the engine to turn more freely and much faster. Some of these small engines can reach over 30,000 revolutions per minute.
See More Henry Parohl Engines at: www.flickr.com/photos/15794235@N06/sets/72157634219050453/
See More Two-Cylinder Engines at: www.flickr.com/photos/15794235@N06/sets/72157649352645204/
See Our Model Engine Collection at: www.flickr.com/photos/15794235@N06/sets/72157602933346098/
Visit Our Photo Sets at: www.flickr.com/photos/15794235@N06/sets
Courtesy of Paul and Paula Knapp
Miniature Engineering Museum