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Old 06-30-2009, 05:02 PM   #1
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Question Momentary F/I via compressed air?

I had an idea, and I've never heard of it before. Don't know if anyone's ever tried it, but with some info from you F/I guys, I would be willing to guinea pig my car.

The hypothetical setup is simple. Run an electric air compressor, which keeps a small air tank charged. When you hit a WOT switch, the air tank force feeds some of its contents into your intake.

I don't expect this will actually make boost, even if you direct the flow of the air toward your engine, because your intake is still open on the filter end.

I don't know if this would require an upgraded fuel system. Unless there was some kind of slow release valve, the fuel system would have to be able to react in the airflow spike.

I also know this will be a momentary thing, 'cause as soon as your reserve air tank is empty, you gotta wait for it to fill back up again.

I imagine the right gauge setup for this would be A/F ratio, Vac/Boost guage or just Vacuum, and a tank pressure gauge.

Comments, ideas, input? Tom, I'm lookin' at you... =)


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Old 06-30-2009, 05:26 PM   #2
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I don't see where this would benefit you unless the compressed air was colder than you can get from outside temps it's not like it make boost
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Old 06-30-2009, 05:39 PM   #3
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I just said in my first post that I wouldn't expect it to make boost. However, you're tapping a source that exceeds atmospheric pressure and shoving it into your intake. That's gotta do -something-.

Take a ram air induction system for example. Boost? No. Gains? Yes. Small, and speed-dependent, but there are gains.

Found this on an invention website: "You are all too late. The idea has been used successfully three times i know of. In the early 60s Gm experimened with a ventura device and a small air comressor and reciever on six cylinder cars (Chevy II) and it appeared in Mech\ Illust . Appaerently is worked well for passing but never made production. The late Mickey Thompson used it in a Mustang funny car with Danny Ongias driving. That was carried in many popular hot rod mags, (power was reportedly almost uncontrolable)"

I'm talking about feeding this air at a higher rate than your engine would pull it in naturally, which will decrease intake vacuum. Boost would be tough if not impossible on my proposed setup, because there's no air pump keeping the forced air from just coming back out the filter like there is on superchargers and turbochargers.
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Old 06-30-2009, 05:46 PM   #4
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My goal here is safe, instant, and almost free power. Granted when your tank is below nominal pressure, you'll be increasing load on your alternator to run the air pump, but you'll only have to deal with that after using the system.

I'm talking about assistance with passing, getting onto an on ramp, or just for fun when you stomp it. System only activates on wide open throttle.
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Old 06-30-2009, 06:01 PM   #5
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go for it then
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Old 06-30-2009, 06:06 PM   #6
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I might. Waiting on more info from experience.
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Old 06-30-2009, 07:04 PM   #7
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only benifit this may have is cooler air in the intake, it will add no pressure whatso ever. the cylinder is only going to draw in what it normally does.
good way to screw up an engine since you are adding air after the maf which will cause a lean condition. any extra air will go right out the intake.
theres a major difference between ram air and what your talking of doing, and reasons its not being done. mainly the cost for a very minor if any gain.
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Old 06-30-2009, 07:10 PM   #8
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Quote:
Originally Posted by goinloco1 View Post
only benifit this may have is cooler air in the intake, it will add no pressure whatso ever.
Wouldn't that depend on the size of the line going from the tank to your intake, and the PSI of the tank?

Quote:
Originally Posted by goinloco1 View Post
good way to screw up an engine since you are adding air after the maf which will cause a lean condition. any extra air will go right out the intake.
I never said I was adding it after the MAF. I have a K&N FiPK, and was actually considering ducting it into the lower "U" bend between the filter and the MAF.

Quote:
Originally Posted by goinloco1 View Post
theres a major difference between ram air and what your talking of doing, and reasons its not being done. mainly the cost for a very minor if any gain.
Ram air uses the speed of the car to push more air into the intake system than it would naturally pull in. My idea accomplishes the same thing, just by different means.

I wish someone would actually -discuss- this with me instead of just shooting it down.
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Old 06-30-2009, 07:23 PM   #9
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Sounds kind of like some of the years of the lightning that used the AC for like a 50hp temporary boost in power when you were at WOT, lasted like 10 seconds and took a little bit to recharge.
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Old 06-30-2009, 07:36 PM   #10
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1 any psi that did go to the intake would be let out through the filter so no gain to the engine unless the engine gets psi

2 It would take a tank larger then you could put in the car and a compressor the size of the car just to try to keep up , an engine takes a very large cubic feet of air at WOT

3 this is why things like the electric blowers and weed eaters dont work they cant make boost and move enough air to maintain psi

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