Bleeblobz

iTrader: (1)

I'm just throwing this out there, this may be a completely stupid idea. Has anyone ever ran compressed air directly into a carb of a rotary motor? I know in a piston motor, doing this would not be good, but how about a rotary? I'm not talking 140 ft/lbs either, if you could meter it somehow. This is basically what a super/turbo charger does, right? Again, this is just a thought.

Jeff20B

iTrader: (13)

The closest thing I've seen involved some internet car video guys installing a few leaf blowers in some piston car and actually getting slightly faster times. Seemed like a ton of work and money for a tiny gain.

Here's a better thought. Get a "super/turbo charger" like you said.

DivinDriver

iTrader: (15)

Back in 08 or 09 I suggested something similar; I'd been messing around with calcs based on HP scuba tanks which hold 100-120 cu.ft. of compressed air at around 4000PSI.

Pretty much got laughed off the forums.

Bleeblobz

iTrader: (1)

I ran across a website that had 2 leaf blowers on a corvette and I agree that looked like a lot of extra work.

Did you ever have any luck with the tanks? I'm not going to laugh at you at all, it's just a idea.

Husky

It could also double at making your car amphibious.

j9fd3s

iTrader: (3)

a turbo or supercharger increases FLOW by increasing density. pressure is an easy thing to measure, but we really care about the mass airflow.

compressed air would work, but you need a lot of it. to wit, a stock Nikki carb can flow 330 Cubic Feet of air per minute (CFM), which is rather a lot, the 110 cubic foot, scuba tank would run the engine for, ~20 seconds.

this is why we use a turbo/supercharger, there is no tank, only spoons

garagemahal76

there have been older used methods of using compressed air , not nitrous, but in their tanks perhaps, to help spool up turbos from the cold side. I think this was a Gale Banks or Smokey Yunick trick.

j9fd3s

iTrader: (3)

that does work, or you can inject water into the exhaust before the turbo, when it turns to steam, it expands 18x, so this helps a lot

diabolical1

iTrader: (3)

holy crap! really? that's pretty neat.

Bleeblobz

iTrader: (1)

Thanks for the info, I understand that a lot better than its won't work. It looks like large diesel motors also have aftermarket compressors, like you said, it should be used with a turbo. I think bendix has some products.

rotaryjunkee

http://en.m.wikipedia.org/wiki/Compressed_air_car

Check the link, its to a car that runs on compressed air

Sent from my samsung gs4 using RX7Club app

rotaryjunkee

Look up also di pietro motor on google or youtube

Sent from my samsung gs4 using RX7Club app

Bleeblobz

iTrader: (1)

Citroen and volvo both have one along with many small builders. Here's a story I came across last week.

http://www.engadget.com/2014/10/03/c...cept-hands-on/

Jeff20B

iTrader: (13)

I'm bringing this back because I just ran across the video I talked about above. Enjoy.

DivinDriver

iTrader: (15)

Which is why I had proposed it for drag racing use... only need a few seconds, & a tank, valve, and lines would be far simpler and much lighter than a blower or turbo.

One added benefit is that as you release a compressed gas to a lower pressure, you get a great deal of charge cooling also - which increases mix density. All mechanical cooling systems depend on this effect.

You might even need to heat the mix to prevent icing - - opposite of the issues that turbos have trying to get the mix cool after compressing it.

Not anything I'm not likely to ever actually try, as I don't race, but still looking for reasons why it shouldn't be tried.

NCross

iTrader: (18)

Just hook the air pump straight to the carb!! 200 horsepower gain! Search air pump supercharger.

LongDuck

At the video, 23:15 says it all, "On this episode of Roadkill, we prove the internet is right and leaf-blowers don't work!" - there, I just saved you all 24 minutes of your life.

By their own admission, the only gains they found were on the chassis dyno and aerodynamics prevented their $1600 worth of leaf-blowers from being able to make more than 2mph difference over a timed 1-mile test course.

Not sure what kind of racing this method of 'boost' would apply toward, but it better be low speed, and preferably tied down to a chassis dyno! Interesting experiment, nonetheless...

Aaron Cake

iTrader: (1)

I've experimented with pre-turbine water injection.

The results are fairly dramatic.

Thing is that no one makes a system so it's a matter of cobbling together parts. I found some stainless compression fittings and welded the threaded end solid. Then drilled a tiny hole to make them into a nozzle. Tapped manifold, threaded in. Then ran copper line.

Ideally the nozzle would have some sort of check valve because the heat will boil away the water in the lines so the pump ends up refilling them.