Old HHOers used the 1:95 stoich of HHO to AF mixture. But I believe it is much smaller than this.

1 part of HHO mixed with 10 parts of ambient air will still give a big explosion under pressure.

The quick burning characteristic of HHO enables or facilitates combustion much nearer the power stroke.

This is why many DIYers felt power increase even with a .1LPM HHO on board gen.

In my data, a 0.35LPM gen can give about 20% Mileage gains on a 1300cc engine driven daily and normally.

A 0.5LPM gen can give about 30% to 50% extra mileage provided the alternator can handle it.

Torque results normally dont appear in favor of an HHO enhanced engine in the threadmill since the power gains are not that huge to be obvious.

As what Philmagi said, addition of this gas into the air stream enhances the combustion characteristic of the ICE.

The experience with Carburated N/A cars can be felt right away. With regards to Forced inducted engines, the turbo puts more pressure in the Manifolds and therefore, an HHO induction system cannot be placed after the turbo... only before, at the air cleaner area.

On a 150cc 4 stroke motorcycle, 0.01LPM gen. can give at least 20% extra mileage.

Unlike additives... HHO does not enrich your fuel. It only enriches the air.

You can find many examples how an HHO flame is enhanced with the addition of ambient air. (not pure O2)

Another characteristic of HHO is is doesnt radiate heat. However, it's flame will heat any object it gets in contact with.

The reason why HHO-enhanced cars run cooler is because HHO explodes at the rate of close to Mach 7 per second. Much faster than normal H2 or O2 alone. This quick burn hastens the slow burning property of gasoline or diesel.
This quick burn creates a cooling effect since there is only a shorter heat radiation time. Unlike slow burning fuel alone will have longer heat patch which of course will raise engine temperature in effect.

HHO does not really lean your combustion... however - if you read your EGT, it will be higher and will be interpreted by an ECU as running lean. Higher because there the hot spots are now displaced much farther away from the combustion chamber and more nearer the tail pipe. In effect, the heat energy is partly converted to mechanical advantage - but not that groundbreaking.

This is why a MAP/ MPAF or EFI enhancer is needed to mitigate the altered readings in an OBD1 or OBD 2 car.

The good thing with HHO is this quick burn allows the engine to be relatively burn fuel cleaner... even if it has a lose compression or if some piston pumps oil, it tends to also combust the oil fumes inside the cylinders resulting to a much cleaner exhaust.

Significant improvements can be seen with old cars since they are less efficient already due to wear and tear. But even newer cars can benefit provided the installer knows and understand what he is doing.

A good knowledge on how a vehicle works will really help. The best installers for HHO are car enthusiasts or race mechanics since they know engines more.

Recently I trained 3 mechanics... they all graduated from Automotive courses... they were surprised with what they learned regarding this... because - they said: "It's not taught in school"... Of course not!

I wont go in the details why... but more research and development is needed so the public may understand it and appreciate it's advantages.

I can say some right now:

1. HHO is a quick fix; it does not suggest a completely new platform or infrastructure; It can be retrofitted easily in the already existing and used platform... therefore: Not costly.

2. HHO can be a sustainable solution: It is right now only an enhancement, but the possibilities can be further expanded. More research are currently being made as we speak.

3. The source for HHO is infinite... Nobody can own exclusive rights from its' source, it's public domain. Big corps. feel threatened with any development that may happen to this technology - this is why it's suppressed in the first place. Even if there will be 10 more Ondoys or Parma that will hit our country or any country whatsoever, they will stick with their skepticism and instead of allowing development to take place in this less explored path, they will even block every attempt that favors it's progress.

The truth will be realized only when it's already too late.

For those who want information...

1/2 LPM of HHO in a 1600cc car and below will give at least 30% extra mileage.

1/2LPM is = 30 Liters of HHO gas in 1 hour.

If you have 30 Liters of HHO gas in storage and you use it as your fuel... will yo car not move? Of course it will.

30 Liters of HHO gas will not be consumed without air.

The way fuel is consumed... with the stoich 14.7:1 ratio AFR, HHO can be injected with also a stoich proportion... this still needs to be established as to what is the best ratio in order to be able to fully utilize this controversial gas.

Since this will take time and money to develop further to be used as pure fuel alone, it will be more practical to use it as supplemental fuel to enhance and maximize the power potential of your basic fossil fuel. 30 Liters of HHO spread over the length 1 hour duration of driving will definitely give you a more enjoyable ride.... with less guilt.

I am not saying Fossil fuel is bad, the slow and incomplete burning and of fossil fuel is bad. Making it burn more thoroughly can make and help fight air pollution... or global warming in general.

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