jedi
Well-Known Member
The Light Flight area at Sun n Fun had a display of a variable compression, Scotch Yoke, opposed piston engine. The engine was displayed in parts but was said to have run and had the typical "high performance" claims. The parts were heavy and clearly concept development hardware.
I could not find a general engine area to this forum so this post is under "New Technology". I will post photos later but wanted to initiate a discussion area for others that may have talked with the developers.
The variable compression is accomplished with a hydraulic valve lifter type device within the base of the piston to Scotch Yoke connecting rod. With low compression (claimed 10:1) it is a spark ignition. When the compression is raised to 20:1 it becomes a compression/detonitation engine. It is a two cycle with some interesting air flow scavenging and has gone through several development stages. It currently has an overhead intake valve in addition to combined cross flow and opposed loop scavenging ports.
I could not find a general engine area to this forum so this post is under "New Technology". I will post photos later but wanted to initiate a discussion area for others that may have talked with the developers.
The variable compression is accomplished with a hydraulic valve lifter type device within the base of the piston to Scotch Yoke connecting rod. With low compression (claimed 10:1) it is a spark ignition. When the compression is raised to 20:1 it becomes a compression/detonitation engine. It is a two cycle with some interesting air flow scavenging and has gone through several development stages. It currently has an overhead intake valve in addition to combined cross flow and opposed loop scavenging ports.
