[cfg83]

Hello -

Here's another article :

Effect of H2/O2 addition in increasing the thermal efficiency of a diesel engine
http://smacksboosters.110mb.com/HHOdiesel.pdf - 2008-2009

4. Conclusion
The impacts of using a small amount of H2/O2 mixture as an additive on the performance of a four-cylinder diesel engine were evaluated. The required amount of the mixture was generated using electrolysis of water considering on-board production of H2/O2 mixture. Hydrogen which has about nine times higher flame speed than diesel has the ability to enhance overall combustion generating higher peak pressure closer to TDC resulting in more work. The experimental results showed that with the introduction of 6.1% total diesel equivalent H2/O2 mixture into diesel, the brake thermal efficiency increased by 2.6% at 19 kW, 2.9% at 22 kW, and 1.6% at 28 kW. The brake specific fuel consumption of the engine reduced by 7.3%, 8.1%, and 4.8% at 19 kW, 22 kW, and 28 kW, respectively. However, adding H2/O2 beyond 5% does not have significant effect in enhancing the engine performance. The emissions of HC, CO2 and CO were found to be reduced due to better combustion while NOx increased due to the higher temperature reached during the combustion.

The 5% is in agreement with a 1989 ICE + H2/02 study from Israel. That study concluded that anything above 5-6% H2 has no positive effect. Too bad about the Higher NOx.

CarloSW2