Does Hydrogen Injection Actually Work?

What is consistently reported

• ▸Faster flame propagation and shorter combustion duration
• ▸Reduced unburned hydrocarbons and carbon monoxide
• ▸Reduced smoke opacity and particulate mass at mid to high load
• ▸Improved brake thermal efficiency in most bench studies

What varies widely

Fuel-consumption improvement is the number operators care about and the number that varies most. Published bench results span low single digits to the mid teens depending on enrichment rate, load point, injection timing and baseline engine condition. Field results on real duty cycles are typically lower than bench results.

We cap our own stated expectation at up to 15% and treat anything above that as unsupported. Results vary by engine, duty cycle, fuel quality, maintenance state and baseline. Any figure quoted here is an upper bound observed under favorable conditions, not a guarantee for a specific vehicle.

The NOₓ trade-off

Higher peak in-cylinder temperature can increase NOₓ formation. Several studies report a smoke/NOₓ trade-off rather than an across-the-board emissions win. Operators in NOₓ-regulated applications must account for this and should not assume simultaneous reductions in every pollutant.

How to test it properly

• ▸Baseline at least 60 days or 10,000 km/6,000 mi on the same routes and drivers
• ▸Log consumption from ECU telemetry or full-tank method — never from trip computers alone
• ▸Run A/B by disabling the unit for alternating periods rather than comparing seasons
• ▸Record load factor, idle share and ambient temperature alongside consumption