The REVETEC Engine design consists of two counter-rotating “Trilobate” (three lobed) cams geared together, so both cams contribute to forward motion. Two bearings run along the profile of both cams (four bearings in all) and stay in contact with the cams at all times. The bearings are mounted on the underside of the two inter-connected pistons, which maintain the desired bearing to Trilobe clearance throughout the stroke.
The two cams rotate and raise the piston with a scissor-like action to the bearings. Once at the top of the stroke the air/fuel mixture is fired. The expanded gas then forces the bearings down the ramps of the cams spreading them apart ending the stroke.
The point of maximum mechanical advantage or transfer is around 20-30deg ATDC (when the piston moves approximately 10% of its travel) making the most of the high cylinder pressure. This compares to a conventional engine that reaches maximum mechanical advantage around 60-70deg ATDC. (after the piston has moved through just over 40% of its travel, losing approximately half of the cylinder pressure).
The effective cranking distance is determined by the length from the point of bearing contact to the centre of the output shaft (not the stroke). A conventional engine's turning distance is half of the piston stroke. The piston acceleration throughout the stroke is controlled by the cam “grind” which can be altered to suit a wide variety of fuels, torque requirements and/or rev range.
The piston assembly slides rigidly through the block via an oil pressure fed guiding system eliminating piston to cylinder-bore contact.
This reduces wear and lubrication requirements in the cylinder, and also reduces piston side shock making ceramic technology suitable.
One module can either comprise of two trilobate cams and either two, or four pistons in an “X” configuration.
The counter rotation is performed by a reverse gear set at a 1:3 ratio shaft providing two strokes of a piston to 360 degrees of output shaft rotation.
The same as a conventional engine.
The Revetec engine is not just highly efficient, the performance and acceleration is outstanding.
During all dynamometer testing we have experienced an excellent torque curve due to the early and prolonged torque lever produced. This was achieved without the use of features such as forced induction.
In tests using asymmetrical Trilobes, we have achieved almost 90% of peak torque from the earliest in RPM we could start the dynamometer tests.
We designed and built our X4v2 gasoline prototype and optimised the engine to be most efficient at 2,000rpm. We had the X4v2 Independently tested at 2,000rpm and the result was 207g/kW-h or 39% efficient making it the world leader. Revetec engines are the most efficient gasoline engines in the world, and because our technology is non fuel specific, we will soon prove that it will be the most efficient in the world running on diesel.
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