Pneumatic SYS inline 3 cilynder engine
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The LPEpower team is most proud to present you this new inline 3 power plant, we consider it to be an epitome of efficiency.
Compared to its predecesor it is more powerful, smaller and lighter.
SYS I3 has two completely new features:
- The new crankshaft concept in combination with the Scotch Yoke principle of operation. The first and last crank pieces are constructed from 36 toothed bevel gears and are interconnected with a very rigid longitudinal shaft that prevents the crankshaft from twisting, which in terms greatly improves the torque output.
- The new camless valvetrain. Sliding yokes directly move the valve rockers - there are no shafts, cams or pushrods in the new camless valvetrain, therefore a huge amount of torsional friction has been eliminated - the new SYS I3 has ONLY eight moving parts! (For comparison: a standard conrod inline 3 with pushrod valvetrain would have arround 17 moving parts)
The maximum speed on 4 bars (60 psi) of pressure is an amazing 1500 rpms, but this engine is not about its max speed, it is all about the torque that comes from such a small package!
We compared the SYS I3 torque output in practical aplication directly against one of the older V8 engines, yes you hear it right, we dared to put the new SYS I3 against the 2005 V8 that originally powered Alex's huge and 5 kg heavy Ford Mustang model. Alex luckily still has the Mustang assembled. And guess what, the small inline 3 cylinder outperformed the V8!! Watch the videos for proof. All of the videos from the outdoor filming session can be found on the LPEpower and nicjasno YouTube chanels.
| Mustang powered by old V8 | Mustang powered by SYS inline 3 |
Specifications:
| Cylinders: | 3 |
| Bore: | 2 studs |
| Stroke: | 2 studs |
| Crank-throw: | 1 stud |
| Main bearings: | 4 |
| Valves: | 1 valve per cylinder (camless) |
| Lubrication: | Silicone-based lubricant |
| Max speed: |
1500 rpms (4 bars / 60 psi) |
| Recommended operating pressure: | < 6 bars / 90 psi |
| Max tested pressure: | 8 bars / 120 psi |
| Min operating pressure: | 0.3 bar / 5 psi |
| Length: | 13 studs |
| Width: | 8 studs |
| Height: | 12 studs |
| Weight: | 240 gramms |
The engine ships fully assembled!



