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Compressed air injection

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Old Feb 7, 2021 | 03:21 PM
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Compressed air injection

Looking for feedback, my idea is to inject compressed air into the intake manifold on each of the intake runners. Purpose is obviously to increase hp., My thought is if I could put high pressure air injectors about 3 inches above the fuel injectors and have them kick in at max throttle for 10 to 15 sec. , it might give me that extra boost to pass on the highway. Just a thought, Whats yours ?
 
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Old Feb 7, 2021 | 03:48 PM
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You stand a good chance of creating a lean condition and burning holes in pistons.
 
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Old Feb 7, 2021 | 04:15 PM
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Would love to see the air storage for this. However this has already been done, it's called forced induction so look up supercharging or adding a turbo.
 
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Old Feb 7, 2021 | 08:01 PM
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Compressed air injection

Originally Posted by ford390gashog
Would love to see the air storage for this. However this has already been done, it's called forced induction so look up supercharging or adding a turbo.
this idea is on the economy side, less than 500 bucks, not insearch of 1000hp, maybe a extra 25hp for 20 seconds or so at full throttle. Something around 10psi /2cfm into each intake runner before the fuel injectors. It's just a idea.
Thank You
 
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Old Feb 7, 2021 | 08:10 PM
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Compressed air injection

Originally Posted by 85e150
You stand a good chance of creating a lean condition and burning holes in pistons.
not sure it would burn a hole in the pistons, only injecting 2cfm@10psi.
Thank You
 
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Old Feb 7, 2021 | 08:57 PM
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Going lean under high load and high rpm. You need fuel with that air. In the long history of the ICE, almost everything has been tried.
 
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Old Feb 8, 2021 | 09:50 AM
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Originally Posted by Speckman62
Looking for feedback, my idea is to inject compressed air into the intake manifold on each of the intake runners. Purpose is obviously to increase hp., My thought is if I could put high pressure air injectors about 3 inches above the fuel injectors and have them kick in at max throttle for 10 to 15 sec. , it might give me that extra boost to pass on the highway. Just a thought, What's yours ?
Not to discourage you, but doing it the way you're describing doesn't seem plausible. With a supercharger or turbo the system is after the air intake to keep the pressure flowing towards the cylinders. With an injection system like you've described, there is nothing to keep the pressure from heading back to and through the air intake (filter.)
 
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Old Feb 8, 2021 | 04:38 PM
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Compressed air supercharging is a thing and is used in some racing venues. It is used in the same way that nitrous is used, max effort short duration.

the problem with compressed air supercharging is that all of the air going into the engine has to come from the air tanks and the entire intake tract has to be sealed between the tank and throttle body. You can’t just hook a compressed air line up somewhere upstream of the cylinders because the air will just go out the wrong way through the filter.

it’s a neat idea but it takes a quick acting ball valve to switch between compressed air and atmospheric.

For the amount of trouble you are talking about doing, a small 50hp shot of nitrous would do the same thing and would actually work the way you are talking about
 
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Old Feb 8, 2021 | 07:27 PM
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Compressed air injection

Originally Posted by meborder
Compressed air supercharging is a thing and is used in some racing venues. It is used in the same way that nitrous is used, max effort short duration.

the problem with compressed air supercharging is that all of the air going into the engine has to come from the air tanks and the entire intake tract has to be sealed between the tank and throttle body. You can’t just hook a compressed air line up somewhere upstream of the cylinders because the air will just go out the wrong way through the filter.

it’s a neat idea but it takes a quick acting ball valve to switch between compressed air and atmospheric.

For the amount of trouble you are talking about doing, a small 50hp shot of nitrous would do the same thing and would actually work the way you are talking about
Thank You for your reply and everything you said is understandable, but what I'm wanting to achieve is just a small gain at max throttle. Injecting 2cfm@10 psi just before the fuel injectors in the intake manifold. Let me know if you still think this is a waste of time. Thank You
 
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Old Feb 8, 2021 | 07:32 PM
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Compressed air injection

Originally Posted by meborder
Compressed air supercharging is a thing and is used in some racing venues. It is used in the same way that nitrous is used, max effort short duration.

the problem with compressed air supercharging is that all of the air going into the engine has to come from the air tanks and the entire intake tract has to be sealed between the tank and throttle body. You can’t just hook a compressed air line up somewhere upstream of the cylinders because the air will just go out the wrong way through the filter.

it’s a neat idea but it takes a quick acting ball valve to switch between compressed air and atmospheric.

For the amount of trouble you are talking about doing, a small 50hp shot of nitrous would do the same thing and would actually work the way you are talking about
Thank You for your reply, point taken, just trying to get a small gain at max throttle with out investing a butt load. Thank You again
 
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Old Feb 8, 2021 | 11:02 PM
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Originally Posted by Speckman62
this idea is on the economy side, less than 500 bucks, not insearch of 1000hp, maybe a extra 25hp for 20 seconds or so at full throttle. Something around 10psi /2cfm into each intake runner before the fuel injectors. It's just a idea.
Thank You
Well.. how do you propose keeping the pressure in the intake? Better check the math, if you plan on hitting that engine with 10psi you will be picking up parts. The stock internals hold 6psi on average. Also to get 6psi you need roughly a 3.0L supercharger and move a extra 140 cfm at WOT.
 
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Old Feb 9, 2021 | 04:54 AM
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Compressed air injection

Originally Posted by ford390gashog
Well.. how do you propose keeping the pressure in the intake? Better check the math, if you plan on hitting that engine with 10psi you will be picking up parts. The stock internals hold 6psi on average. Also to get 6psi you need roughly a 3.0L supercharger and move a extra 140 cfm at WOT.
thank You, Excellent point
 
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Old Feb 9, 2021 | 09:49 AM
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The only way I could see this idea generating any more horsepower is if there was a significant restriction on the intake snorkel or filter. If that were the case, then perhaps the additional airflow could compensate for the restriction.

I love the idea of compressed air supercharging. It is a really cool idea and it does work, but it takes a dedicated system to make it work.

It takes quite a bit of air just to do a quarter mile. I realize you are talking about short bursts, but the amount of air an engine consumes at 5,000 rpm is mind boggling.
 
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Old Feb 9, 2021 | 06:58 PM
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Going to need a way of increasing fuel flow when the compressed air is injected into the intake manifold, other wise the extra pressure in the intake will effectively reduce the ability of the fuel pump/fuel injectors to squirt fuel into the higher pressure in the intake runners. That makes the engine go lean and go boom.
 
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