H2+0.... Steve !
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Manta is correct in most things, and this is probably Not the exception...he could be Right here too!....
here's why I say that...
Imagon the smallest 4 stroke engine you can get/make or Obtain... more than likely it will be very small on the order of 1/2inch c.I.D. so small as to hardly have any HP power at all...
now imagon the largest Altenator that it can turn and still run.... again very small, probably on the order of less than 5 amps....
Now you can start to see the problem. can that small altenator generate enough electricity to make enough Hydroxy gas to power the tiny motor....
and as Manta suggests ...the answer is NO. there is just not enough electrical power there
even though the LPM is very small, even with a Hydroxy cell that gets 1.5LPM at 10 amps,
scaleing it down to the available power looses efficiency in a big way.
... HOWEVER... the larger the engine is the more effecient its running can become, and the same thing goes with the Altenators....
....
lets take a example... a 10hp Briggs and Stratton, hooked to a 100amp altenator, powering 4-20amp cells that put out 2LPM each....
with this setup it is far different than the smallest unit you can imagon,because it is of KNOWN VALUES....
the motor can turn a 100amp altenator at full load ( and we are only loading it with 80 amps not 100amps...) the cells we know can produce that much hydroxy gas,for a total of 6LPM
the big question now is can the 10HP motor be powered with a mear 6LPM at 100% hydroxy gas...

and its a toss up.... it should be able to, but it may not be able to because its just too lean.
....
with that example we have a MARGINAL system... it might and Might not work.
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One more example, a 2.4Liter engine turning a 300amp Altenator, powering 4 Cells at 50amps each
getting 5LPM each...
thats a total of 20LPM for only 200amps and in theory it is more than enough to power my truck engine, even under load.
...
the next step up would be a 5LTR V8 turning 2-300amp alternators powering 10cells at 50 amps each
.... is 50LPM enough to power a big V8 on 100% hydroxy gas ? I dunno but it should be!!!!!
can the engine turn 2-300 amp alternators.... yes obviously!
....
so you can see that as you get bigger in size with the units we begin to have EXCESS horse power and excess electrical power, and excess HYDROXY GAS.....
but everything has to be perfect to do this.....
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Most people calculate the Hydroxy gas NEEDS for an engine all wrong... they go by engine displacement and then times the RPM.... and thats totally wrong.... simply because the engine is ONLY useing all that displacement in a FULL THROTTLE siduation.
most of the time your only pushing on the accelerator a tiny amount.... so how much LPM is that going to take ? your only useing say 40hp of the available 150hp.... how much hydroxy gas does it take to make 40hp..... not 150hp, because I don't drive at full throttle!
so what I need is some sort of storage tank, to capture the un used HHO and save it for when I accelerate!....
... I'm sure it will work !
...
Bob........