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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
magnet18 wrote ...
.
Also, from a physics standpoint, friction is irrelevant of surface area. Less area means more force on the applied area, things equal out.
Letting air out of your tyres does give you more grip in on ice or snow, maybe because road tyres have 'tread'. (more 'treads' in contact with the road?)
Registered Member #3781
Joined: Sat Mar 26 2011, 02:25AM
Location:
Posts: 701
Ash Small wrote ...
magnet18 wrote ...
.
Also, from a physics standpoint, friction is irrelevant of surface area. Less area means more force on the applied area, things equal out.
Letting air out of your tyres does give you more grip in on ice or snow, maybe because road tyres have 'tread'. (more 'treads' in contact with the road?)
yep, more tread in contact with road = more surface area = more friction = more grip
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
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Posts: 624
I think it has more to do with the static friction thing, softer tires will roll and form more, so instead of breaking the static friction they maintain it longer.
Registered Member #14
Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383
Ash Small wrote ...
If you ran the electrolysis off a wind generator, and used the generator to pressurise the hydrogen and stored it in a tank you could run your car for free! (after you buy the wind generator, pump and tanks, but they'd take up all the room in the boot/trunk if you wanted to go far)
Actually it is illegal because this way you don't pay fuel taxes, at least in italy (where is illegal using anything but taxed fuels for autotraction, even self-prepeared biodiesel).
Regarding the HHO device , it is very controversial. The authors claim that the presence of some hydrogen helps to raise the efficiency of the burning gasoline so the effect is not the energy brought by the hydrogen but the effect on the efficiency of the thermal engine. Of course there's no study showing positive effects on the fuel efficiency (or it is too small to be detected) so it must be considered a complete scam...
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
TheMerovingian wrote ...
Ash Small wrote ...
If you ran the electrolysis off a wind generator, and used the generator to pressurise the hydrogen and stored it in a tank you could run your car for free! (after you buy the wind generator, pump and tanks, but they'd take up all the room in the boot/trunk if you wanted to go far)
Actually it is illegal because this way you don't pay fuel taxes, at least in italy (where is illegal using anything but taxed fuels for autotraction, even self-prepeared biodiesel).
.
While we do have similar laws in the UK regarding bio-diesel, I believe electric cars are tax-free as far as the electricity is concerned. This is because the government is trying to encourage 'clean' fuels.
While I don't know for certain, I imagine similar tax incentives would probably also apply to hydrogen, for the same reason.
Registered Member #509
Joined: Sat Feb 10 2007, 07:02AM
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TheMerovingian wrote ...
Regarding the HHO device , it is very controversial. The authors claim that the presence of some hydrogen helps to raise the efficiency of the burning gasoline so the effect is not the energy brought by the hydrogen but the effect on the efficiency of the thermal engine. Of course there's no study showing positive effects on the fuel efficiency (or it is too small to be detected) so it must be considered a complete scam...
I was going to post something along the lines of that, but got dis-interested ~1/2way though. Hydrogen, or hydrogen and oxygen affecting something like combustion temperature, flame front propagation speed, affecting the burn chemistry so non-stoichiometric mixtures yeild different end products etc... (not saying any of those are true, just pulling effects that could possibly happen, and maybe have an effect on engine efficency, out of thin air) All could be believable, but a study would definitely be needed. An electrolysis cell shouldnt even be coming into the picture until its proven that hydrogen, or hydrogen/oxygen added do anything. I.E. an instrumented test engine, some hydrogen and oxygen cylinders, and an engine dyno. If you find your boost in efficiency, then start figuring out if you can get the gas you need without consuming more energy then you help generate.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
I recall reading that the H2+CO mixture (aka carbon arc under water) can run some petrol engines.
High risk due to CO being extremely toxic but it could be interesting if you obtained a cheap source of batteries (cough recycled large format Li-Ion cells /cough) as long as they hold >60% of capacity you might get some useful life from them.
Someone else suggested reprogramming the memory chip (IIRC e2prom or a variant) via the ECU diagnostics connector to adjust fuel to air ratio, or faking out the signals from the lambda sensor so the engine burns a custom mixture.
Interestingly this can avoid the need for an expensive sensor if the lambda has gone bad, as you can somewhat compensate for a slow response by feeding a false sense signal until it warms up, or substitute a length of nichrome wire wrapped below the sense tip and sealed with fire cement.
I wonder if some of these new 10W+ infrared diodes could be used to optimise the timing by replacing the spark plug a la laser ignition.. sounds like something that can be DIY'ed with minimal risk if you use safety precautions.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
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Posts: 624
Ash Small wrote ... If you ran the electrolysis off a wind generator, and used the generator to pressurise the hydrogen and stored it in a tank you could run your car for free! (after you buy the wind generator, pump and tanks, but they'd take up all the room in the boot/trunk if you wanted to go far)
You really think that by pushing blades through the air you can get them to spin and then convert that spinning into electrical energy and then use that to break chemical bonds and the burn the resulting chemicals back into their original configuration and use the resulting expansion caused by heat to push a piston which then turns a shaft which pushes a 2000 pound car along with the blades on top and somehow actually GET energy from the process?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
magnet18 wrote ...
Ash Small wrote ... If you ran the electrolysis off a wind generator, and used the generator to pressurise the hydrogen and stored it in a tank you could run your car for free! (after you buy the wind generator, pump and tanks, but they'd take up all the room in the boot/trunk if you wanted to go far)
You really think that by pushing blades through the air you can get them to spin and then convert that spinning into electrical energy and then use that to break chemical bonds and the burn the resulting chemicals back into their original configuration and use the resulting expansion caused by heat to push a piston which then turns a shaft which pushes a 2000 pound car along with the blades on top and somehow actually GET energy from the process?
Good luck with that.
Where did I mention mounting the wind powered generator on the car?
If you did that you wouldn't need to pressurise it.
What I put was' use a wind turbine to produce the hydrogen and pressurise it'.
Registered Member #3766
Joined: Sun Mar 20 2011, 05:39AM
Location:
Posts: 624
Ash Small wrote ...
magnet18 wrote ...
Ash Small wrote ... If you ran the electrolysis off a wind generator, and used the generator to pressurise the hydrogen and stored it in a tank you could run your car for free! (after you buy the wind generator, pump and tanks, but they'd take up all the room in the boot/trunk if you wanted to go far)
You really think that by pushing blades through the air you can get them to spin and then convert that spinning into electrical energy and then use that to break chemical bonds and the burn the resulting chemicals back into their original configuration and use the resulting expansion caused by heat to push a piston which then turns a shaft which pushes a 2000 pound car along with the blades on top and somehow actually GET energy from the process?
Good luck with that.
Where did I mention mounting the wind powered generator on the car?
If you did that you wouldn't need to pressurise it.
What I put was' use a wind turbine to produce the hydrogen and pressurise it'.
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Running a car off HHO
