Custom Nos Setup But Compressed Air

[trav_555]

ok now i have been thinking about this for many years

 

and i was thinking having an alloy air compressor small one, cause they only weigh like 3.5 kg, in boot. and it hooked up to a switch, these compressors only use like 8 amp or something, so not much power loss, now when i switch on compressor it fills up in boot. then a line goes to carbi and it blows air into the carbi

 

now an aircompressor usually goes up to 135 psi ish, a turbo goes to like 30psi max

 

now once compressor is full i flick off switch and have a second switch that makes it push air from compressor into carbi, like those fan dangled nos setups off fast and furious,

 

 

so technically it would be a turbo nos compressed air setup ish

 

and cops can't go man get rid of that turbo cause i don't got one i have an aircompressor i can say i take to work out on site :P

 

so yeah, any imput from people? i would put a regulator on it to set psi,

 

anyone see any obvious reasons why it wouldnt work/ no about electrics cause the bit thats got me stumped is makin it get rid of air into carbi with the touch of a button, but on top gear the guy spray paint out the back of his car which I'm guessing was hooked up to a compressor so it should be possible

 

anyway cheers

 

Travis, o and on a worked 4k as well

 

:dance:

[Teddy]

% is not about quantity, but ratio. The same goes for fuel and air. Economy to Power Fuel to Air Ratio is 14.7:1 for a general water cooled internal combustion engine. If you wanted power over economy, you would be aiming towards 12.5:1. That being 12.5 parts of air, for every 1 part of fuel.

 

The lower that number (12.5) the richer the mix - ie. The more fuel there is to 1 part air. The higher the number (about eg. 12+) the leaner the mix - less fuel for 1 part air. Keeping this ratio correct is critical for how the motor runs. There are numerous factors to this. I could ramble on for days.

 

Injecting silly amounts of air into the combustion chamber, on any motor would have horrific effects. Sure you could come back and say i have figured out a way to add the correct amount of fuel to this system, provided that you were able to strictly regulate the amount of air going into the motor under all conditions from a primitive backyard-invention. Problem now goes from the incorrect air:fuel ratio, to internal strength.

 

a 4k motor is strong. But its not strong under boost, let alone enough to cut steel in half.

 

I think you need to keep the compressor strictly for work purposes :dance:

[Hiro Protagonist]

I have seen air-compressor set-ups before (one that springs to mind was in a Sigma). Always in paddock bashers, always incredibly crude, and always blew up very quickly. Best one I ever saw had a low-rated pressure regulator on the output, so that it was putting out supercharger-like pressures.

 

Still requires obvious things like a boxed carby though, otherwise it physically won't work (postive air pressure in open carby means no fuel gets sucked through the jets.

[Jason]

How long does it last is the only thing.

 

Been thinking of the same kind of thing only with nitros and dedicated bottles / cylinder. And heat exchangers :dance:

 

:P

Edited November 26, 2008 by Jason

[trav_555]

ok, so its backyardy then,

 

ok so i would have to figure out how to keep ratios the same, i didnt mean push 135 psi in, i would keep it down around 5 or 6.

 

and it would be regulated

 

well i have a liteace top to pod at the moment ahaha

 

but yeah so it would have to be made like a turbo setup as in airbox wise

 

and like with a down draft single weber i think.

 

more thinking is needed

[godlovesugly]

i have an airhorn in my engine bay that doesnt have the horns connected at the moment. i should plumb the air pump to the carby and see what happens....

[trav_555]

do it, how do air horns work?

[white_sandshoe]

Technically, is it worth it?

 

Say you've got a decent sized compressor... a 2hp jobbie with a 21L tank... pretty standard sorta setup right?

 

You've got that pumped full of your 140 odd psi... making that a sum total of about 195 litres of air jammed into your tank.

 

At full noise, how quickly do you think you'll go through that amount of air?

 

with each cylinder using 0.35 litres per revolution, at 6500rpm, you're going through 2275 litres of air...

 

So, putting standard atmospheric pressure into the engine, you'd have about 5 seconds worth of air.

 

With a bit of boost pressure, say 7psi?

 

You'd have about 3.6 seconds on the bottle before running out of puff.

 

 

Keep in mind, you'd need to have fittings big enough to flow 80 odd CFM, as well as some sort of setup that can switch from fully enclosed, to open to atmosphere, otherwise you'd need to run on the bottle the whole time, and really, your compressor won't keep up with that.

 

You could also hit some minor problems with fueling, unless you feel like putting a solanoid controlled fuel line into your carb throat and regulating it for the extra air. (similar to the wet nos shot anyways...)

 

What i'd do if it was me... have a switch that activates three solanoids...

 

One, the air valve. - Lets the bottle flow through the pressure regulator into the carb enclosure.

 

Two, the intake enclosure system. - Closes a pipe in the inlet that would normally be open for N/A driving (could be throttle body style?) to seal the inlet for boost.

 

Three, the on-boost fuel solanoid. - Turns on a boost regulated fuel line tapped into the throttle body that's set for just the right amount of additional fuel. (So you don't need to dick around re-setting the jets and stuff.)

 

 

But, after all that, with a few seconds of boost, it's not really worth it...

 

I'd be looking at a diving tank, 18L, but holding about 4000psi (take into account, that's big for a dive tank...)

 

That'll give you about 1 minute 45 at atmospheric pressure, and about 1 minute 10 seconds on 5-7 psi...

 

But again, how much can that bottle flow per minute??? 80-90 CFM minimum is what you'd need.

[LittleRedSpirit]

Careful you don't turn you car into an oxy welder.

[irokin]

We've got a compressor at work that will do the job! It flows 200cfm at around 150psi, is the size of a side by side fridge freezer, has its own refrigerated air dryer, has a tank attached to it about 500 litres in volume, draws 30kW of 3 phase power to run and cost over $20k to setup.

 

Good luck hooking that up to your car!

 

 

On a side note, read up about how nitrous oxide actually works because its got nothing to do with the pressure its under inside the bottle.

[Roo]

why not just buy a sc12 supercharger for $200, and have boost all the time? then *** around with this air compressor shit

Edited November 26, 2008 by Roo

[white_sandshoe]

We've got a compressor at work that will do the job! It flows 200cfm at around 150psi, is the size of a side by side fridge freezer, has its own refrigerated air dryer, has a tank attached to it about 500 litres in volume, draws 30kW of 3 phase power to run and cost over $20k to setup.

 

Good luck hooking that up to your car!

 

 

On a side note, read up about how nitrous oxide actually works because its got nothing to do with the pressure its under inside the bottle.

 

 

Hear hear...

 

If the concept was effective and worth doing, i'm sure it'd be done more often. Fact of the matter remains, if you want to push more air into your engine, a bottle of compressed air really isn't the way to go...

 

Though, i'd love to know the price on a regulator that can flow 100CFM at 7PSI...

[trav_555]

cheers guys, exactly the answers i was looking for

 

i thought there would be some reason why it wouldnt work

 

thanks for the imput, i guess all we can do is dream..

 

cheers

 

Travis :dance:

[rundell]

that short burst would prob blow headgasket and if you lowered it to the psi of a supercharger for that brief moment wouldnt be all the hassle of setting it up and stuff when you could just wack on a turbo or supercharger and run boost all the time :dance: haha

[trav_555]

i wanted to get past p plate crapiness for better track power :dance:

 

ahh well :P