News

In the early 1900s, the sliding sleeve valve engine had some advantages over tappet valve engines of the time. For example, sliding sleeve valve designs allowed larger intake and exhaust ports, a ...
The follow-on 350 horsepower 7-cylinder R-794 was a dedicated sleeve-valve design and incorporated a supercharger. The U.S. Navy ordered five R-794s in August 1934 and tested them, but the type never ...
The Navy later sponsored a number of unconventional engine designs; however, few entered production. In the case of the 1939 XR-1740-2 development, the outcome was apparently typical of single-sleeve ...