Revolutionary Engine Debuts @ Miami Show

The Dyna-Cam​

Prepare yourself for a look at the future...​

The engine is 13" in diameter, 40" long and weighs 265 pounds with basic accessories. It has unique features and major benefits over conventional engines of similar weight and power. The benefits include lower manufacturing costs in equal production, 50% smaller size, 50% fewer replacement parts, better fuel economy, smoother operation, lighter weight, plus nearly 100% higher torque enabling the engine to turn high efficiency propellers with lower noise output.

The engine has two identical cylindrical blocks that each have six cylinders arranged parallel around the main shaft located in the center. Cylinders of both blocks line up so that six double-ended pistons can fire back and forth between the aligned cylinders of each block Each free floating piston is cut away on the central interior side and fits with precision around a 9" diameter, four lobe, sinusoidal cam that is keyed to the main shaft.

As the pistons fire back and forth, the main cam rolls through the pistons causing the central shaft to turn. All moving surfaces are roller bearing surfaces. Another smaller 5" cam is attached to the main shaft at the outer end of each block. As each valve cam turns, it pushes against hydraulic lifters which push against the poppet valves inside each cylinder head.

The engine is a 4-stroke engine. Because of the design of the main cam, each of the twelve cylinders fires with every revolution of the shaft, in contrast to three times with conventional six-cylinder engines. The engine can be described as a free piston, axially cam-drive engine.

Specifications...

12 Cylinder, 6 Piston
13" Diameter x 40" Length
265 Lbs Dry Weight
373 Cubic Inches
40% Less Friction Horsepower
50% Less Components
25% Quieter with similar exhaust systems
20% More fuel efficient
50% Less space required for installation
Vibration Free Operation
Assembled/Rebuilt in 1/3 time of conventional engines
Liquid Cooled
Fuel Injected
Multi-Fuel use
TBO of 2500 Hours

Horsepower...

Naturally Aspirated Rating of 200 Horsepower
Turbo-Charged up to 350 Horsepower
Turbo-Intercooled up to 450 Horsepower

Torque & HP Ratings...

200 HP @ 2000 RPM
175 HP @ 1600 RPM
650 ft.lb torque @ 1200 RPM
525 ft.lb. torque @ 2000 RPM

1100 ft.lb. torque w/ Turbo
1400 ft.lb. torque w/ Intercooled Turbo

Here is the first in a series of pictures....

The flip side...

From another angle...

The engine has six double-headed pistons which compress and fire at each end. As one end fires, it compresses the other end. This back and forth movement forces the roller cam to rotate and since the main shaft is keyed to the cam, rotational power is developed. Trunion rollers are housed in the middle of each piston that ride along the cam.

The resulting engine operation has a pure harmonic motion and is so perfectly balanced that almost "zero" vibration is developed. Counterweights, vibration dampeners and flywheels are not needed!

This internal drawing gives an idea of how the piston are positioned...

There are many less moving engine parts in the Dyna-Cam, as compared to conventional engines. This engine has less than one-half the parts of other equally powered engines. There are two engine blocks (identical), six double-headed pistons, one main cam shaft, trunnion rollers, valves and valve cam thrust bearings. With the exception of the exhaust system and fuel system... that's it!

Here's a picture of the parts...

This is the DynaCam main engine blocks split in half...

The DynaCam Engine has already been proven successful. The original developer, Dr. Karl Herrman, in conjunction with the Navy, spent millions developing and refining the design, which was used successfully to power Mark 46 torpedos for over 20 years.

The design reached FAA certification in the late 1950's. By the 1980's, it was further refined, retrofitted with new accessories and successfully installed and demonstrated in a 4-place Piper Turbo Arrow.

Over 40 prototypes have been built and tested. Hundreds of thousands of hours later, (40 years!) the engine has finally moved into production at Aero-Marine's new facility located in Ronkonkoma, New York.