Engine performance improvement.
What hydrogen-oxygen enhancement changes inside the cylinder, and how to measure the change on your own engine.
How does hydrogen enhancement affect engine performance?
Hydrogen has a higher flame speed and wider flammability range than diesel. Adding a small hydrogen-oxygen stream to intake air accelerates the flame front, so more of the injected charge burns within the useful part of the power stroke instead of finishing late or leaving soot. Rated power and the factory fuel map do not change.
- Mechanism: faster flame propagation, more complete burn of the same fuel charge
- Unchanged: rated power, ECU calibration, injectors, after-treatment
- Commonly reported: smoother load pick-up, less visible smoke under load
- Runs only while the engine runs (vibration-sensor start / stop)
- Verification: like-for-like baseline before and after, same duty cycle
- Engine types
- Diesel & natural gas
- Displacement
- 1.0 – 16.0 L
- Control input
- None — intake only
- Reversible
- Yes, no engine modification
Three effects inside the cylinder.
Flame speed
Hydrogen ignites and propagates faster than diesel vapour, shortening the time from ignition to full flame coverage across the charge.
Burn completeness
A faster, more even flame front leaves less unburnt and partially burnt fuel — the fraction that otherwise shows as soot or late-cycle heat.
Heat-release timing
More of the heat release lands in the crank-angle window that produces useful work rather than exhaust-side heat.
The engineering discussion is set out in the expert article on thermal efficiency.
How to test it properly.
- 1. Fix the duty cycle: same route, load profile, trailer weight or generator load bank.
- 2. Record a baseline over at least two full weeks or 50 engine hours before fitting.
- 3. Fit the matched unit and commission it — see the installation guide.
- 4. Record an equal post-install period with the same fuel supplier and drivers.
- 5. Compare litres per 100 km or litres per hour, not tank-to-tank impressions.
Structured evaluations are run through fleet trials; the arithmetic is on the fuel savings calculator.
Questions.
Does hydrogen enhancement increase power output?
- The unit does not raise rated power. It changes how completely and how quickly the injected fuel burns. Operators most often report smoother load pick-up and reduced smoke under load rather than a change in rated kW.
Does the ECU need remapping?
- No. Nothing is changed in the ECU, injectors or fuel rail. The gas is introduced into the intake air only, and the engine's own closed-loop control continues to meter fuel.
How should performance change be verified?
- Log a like-for-like baseline before fitting — same route or load profile, same fuel, same driver or operator — then compare an equal period after commissioning. Single-tank or single-shift comparisons are not conclusive.
Is it suitable for engines under continuous full load?
- Yes. Units are rated for continuous operation while the engine runs and start and stop with engine vibration. For continuous heavy load, match the unit to displacement — H-900 up to 7.0 L, D-900 up to 16.0 L.
Continue reading.
Hydrogen combustion enhancement
What it is, how PEM gas reaches the cylinder, and what it does not do.
Fuel efficiency
How to baseline and measure litres per 100 km or litres per hour.
Emissions reduction
Soot, particulate and unburnt-fuel behaviour, and how to test it.
Installation guide
Nine-step fitting sequence: mounting, wiring, gas line, commissioning.
Safety & compliance
On-demand gas, no storage, alarms, shutdowns and reversibility.
Troubleshooting
Alarms, low gas output, water quality and no-start diagnostics.
Case studies & field results
Published operator data and trial methodology.
Compare PEM systems
A-450 to D-900 side by side: displacement, output, current draw.
FAQ
Answers on fitment, water, warranty, freight and duty cycles.