|A 4-stroke cycle with the Creel Loop engine. Click to enlarge.|
A small engine company, Creel Loop LLC, based in Louisiana, is working with a new patented piston design that, in combination with a scavenging loop engine design, functions essentially as a low-cost, naturally-aspirated supercharger to enhance the overall performance of combustion by increasing power output, reducing engine wear, and by reducing the level of unwanted emissions.
In the Creel design, the piston and air diaphragm of the scavenging pump assembly are co-linearly aligned and rigidly connected, using an air diaphragm connecting member that passes through the crankcase. As the piston compresses a loaded air-fuel mixture in the combustion chamber, it causes the air diaphragm to simultaneously draw an air-fuel mixture into the air cylinder without interfering with or relying on the rotation of the crankshaft.
|Prototype of the Creel piston with an inset of the finished version. Click to enlarge.|
When the loaded mixture ignites, the piston reciprocally retracts from the combustion chamber, causing the air diaphragm to supply the new mixture to the combustion chamber through a routing assembly that routes the new mixture from the air cylinder directly to the combustion chamber, without exposing the new mixture to engine lubricating-oil contained in the crankcase and oil pan.
Creel started by focusing on two-stroke applications, but has shifted to a single-cylinder four-stroke. The company is currently building and testing a 6.5 hp engine. They anticipate delivering better low-end torque and improved fuel economy compared to a conventional engine of the same size.
The company is looking at promoting a two-cylinder application of its engine in a hybrid system.
US Patent# 6907850 Internal combustion engine and method of enhancing engine performance