This is Ram Performance Ltd. in Clinton, Ohio. It modifies Subaru engines that it sells under the reference EA-81 adding PSRU or turbo.

“EA-81, 108-115 HP”

“EA-81, 140-160 HP”

-The two powers are a function of the accessories such as the electronic ignition, carburetors or fuel injection and the rpm.

-The mentioned systems are the EFI or “Electronic control for Fuel Injection” and the MPFI or “Multi-Point Fuel Injection”.

-When the Rotrex turbocharger is coupled to the EA-81, the power rises to 200 HP, not requiring intercooler since it is a light MP increase.

“EA-81, turbocharged”

From Appendix 6: This American company offers two engines and they look like Subaru based. Although many parts have been rebuilt and redesigned by Ram, for example forged and lighter pistons, new pro-flow valves, “tuned” intake manifold and many other improvements.

-For all these reasons, the EA series are 115-140 HP and the EJ are 200-300 HP. (see Subaru).

-The 115 HP, has 1.8 liters of displacement, multi-point fuel injection, and EC3 controller. It has mechanical reduction with bases for accessories.

“Ram Performance, 115 HP”

-The 140 HP version is the same 115 HP engine with turbocharger.

-We see the 140 HP in development in the illustration below. The left plate holds the turbocharger.

"Ram 140 HP with the turbo on the left"

From Appendix 10: Ohio Company that converts the Subaru EA-81 into its RAM-115A model, for example.

“Two Subaru engines adapted for aviation”

-The RAM 160AQ is a modified Subaru of 2.2 Lts. SOHC.

-The same as the RAM 115 SC,

-In a recent publication appears the installation of an engine assigned to RAM Performance but it is difficult to distinguish and assimilate its upper parts with the engines of this brand.

-We offer it below. It has a Marcotte gearbox, and it is indicated that it is a Subaru EA-81.

“RAM Performance adapted EA-81”