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Old 02-18-2021, 11:52 PM   #7 (permalink)
Isaac Zachary
High Altitude Hybrid
 
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 448

Avalon - '13 Toyota Avalon HV
90 day: 40.73 mpg (US)

Prius - '06 Toyota Prius
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Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
I guess you have seen something about HHO systems before. That's too energy-intensive for little to no actual benefit.
Electrolysis is way too energy-intensive using way more energy than could be produced from it. Oxygen absorption from air should require less energy, but can still be quite energy-intensive.

Of course oxygen could be produced from electrolysis or absorption or some other means off the car from some energy neutral source (solar, wind, hydro) and bottled and then put on the car. But it would be better to use that energy in a BEV instead of bottling oxygen.

Quote:
Originally Posted by some_other_dave View Post
Umm, how do you propose to remove all nitrogen from the air going into the engine? N2 is roughly 70% of what goes into the engine to start with. Even after adding hydrocarbons and then combusting them, you'll still have around 70% of it is nitrogen of one form or another, mostly N2.

Just routing exhaust gas (cooled or not) into the intake won't substantially change the amount of N2 going through the system, since you'll be displacing 70% N2 air with 70% N2 exhaust.

If you could eliminate NOx, that would enable lean mixtures for good fuel economy. But it's hard to see how this would accomplish it.

-soD
If you first charge the intake/exhaust circuit with pure CO2 to start with then only add oxygen and fuel it should theoretically not have any nitrogen in it ever again. Even if you don't with every cycle it should add more and more CO2 which will eventually displace all the nitrogen until there isn't any.
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