Quote:
Originally Posted by gone-ot
...you can do the same/similar "improvement" with 'shots' of NOX too, because all you're doing is introducing a different fuel into the combustion process, one that either "boosts" power (NOX) or economy (CNG, propane, etc.).
...however, the REAL effect is simply that you're adding more fuel, albeit a different fuel, into the engine.
...add both fuels together, and your net "gain" is seldom above zero.
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Firstly:
NOS is
not extra fuel; it's extra Oxygen/Oxidant.
You need to send in lots of extra fuel to make use of the extra oxygen to get any power out of NOS.
The extra power a diesel engine gets from CNG or Hydrogen or HHO is due to the diesel fuel burning more completely and faster.
Completely:
There's a quench distance of around 2.5mm in an ICE.
ie: The flame in the combustion chamber never gets more than 2.5mm from the cylinder wall, leaving a 2.5 mm thick virtual tube of unburned air-fuel against the cylinder wall.
Hydrogen will het to 0.5 mm from the cylinder wall.
That means a the 2 mm thick tube of mixture that normally isn't burned, is...
Then unburned HCs are a part of any exhaust stream.
If you look at any of the Peer Reviewed, Published Studies from Universities etc you will see that HC and CO are down and CO2s are up when adding H2.
That means that a more complete combustion of the fuel has taken place, giving you more of the ideal exhaust gasses; N2, H20, CO2.
ie: If you add the H2 or CNG and Diesel together; you are still using less fuel for a given amount of power because more of it is actually burning completely; providing said power.
Faster:
Ignition is X degrees before TDC because there's an optimum crank angle where the 'Burn' results in power getting to the crankshaft.
A faster burn, at the correct degrees after TDC therefore means 'more crank turn/torque' rather than wasted heat in the coolant and exhaust...