RAM engines are converted from Subaru automobile engines and are built and marketed by RAM Performance, Ltd. of Clinton, Ohio. RAM markets EA-81 conversions with many variations as can be seen on their RAM Performance Website. Most Subaru conversions require reduction of propeller rpm from that of engine rpm; i.e., a Propeller Speed Reduction Unit (PSRU). RAM offers Autoflight gearboxes, which have versions giving a reduction to 0.476, 0.455, 0.352, or 0.287 of crankshaft rotational velocity and come with the propeller centerline either above or below the crankshaft. RAM also offers turbocharger kits. RAM Performance conversions are also available for boats, hovercraft, and dune buggies. All of these engines are non-certificated engines for use in experimental, homebuilt aircraft.
OL-109 - - {3.622 / 2.638 / 108.7} / {92 / 67 / 1782}
4cyl; EA-81; 100hp@N/A rpm; 1995-present; Wt = 160#.
Liquid-cooled, long-block version of a geared engine; dual carburetors and electronic ignition. Another version has MPFI (Multi-Port Fuel Injection) and single direct-fire ignition with fuel and ignition controlled from the cockpit; it yields 118hp@5200rpm.
Ram Website.
Applications: None found.
4cyl; EA-81; 140hp@N/A rpm; 1995-present; Wt = 170#.
Liquid-cooled, long-block version of a geared engine; MPFI, an EFI (electronic control for fuel injection) management system and dual direct-fire ignition. Other versions with throttle-body fuel injection or a carburetor are available and give 130-140hp. There is a version with MPEFI that delivers 160hp@5400rpm and weighs 197#.
Ram Website.
Applications: None found.