Dave: I have been requested recently to make a video about how the air induction systems on automobiles work or manifolds are air input whatever you want to call it. Will start off with the explaining it on a Honda, because this is a very common tuner type of car and lots of people put call their induction pipes and swear by them. Can I induce you to do, come always get kiddies pop into my videos. Well anyways that the business. So we have a typical stock induction system on this 1995 Honda. Multiport fuel injection with the fuel feed rale. These long tubes are called runners, this air storage box is called a planum and people like to put shiny, smooth pipes in a different air cleaner box and the intake snorkel. Well as you notice the intake snorkel has a few ribs on it because your motor flex is back in forth and it's not that largest diameter could be and of course this room that where you could actually make it longer.
Well, the theory behind adding one of those fancy chrome tubes is, yes it does increase performance a little bit only noticeable under high RPMs. Yes, when you have a exposed air cleaner like electric K&N and that one of those plastic boxes you get adhere engine will sound or sort of sucking sound too it some people like. So the theory is true, if you have a long, smooth, shiny metal pipe yes there is less aerodynamic drag inside of there when the engine is running at high RPMs, so you will get slightly more air flow and if you have a cone-shaped and air filter on the front that's less restrictive in an air box and it allows the engine sounds to emanate and of course it increases flow too. So you won't really notice anything into your RPMs start to get merely passed 3000 to 3500 RPMs and then you will notice the slightest increase in top end performance may be the slightest increase in top-end fuel economy.
Not a big deal but kind of looks nice under head with a lot of black. Well, now to show you how it works on a agenda. I had to use conventional warfare to win the battle to get near this car because they were living in the mirror, those talked in, these are bad. I got stumped twice this week. Well any ways we got a typical two wheeler gas or engine in here VW style and this has a combination intake planum here that gently turns into runners. And the runners continue underneath to have good effective tune runners for your engine it should have smooth curves, fairly smooth innerwalls, you can polish and make them better and the volume from about like here to here if the whole inside in CCs should be close to the same volume as your cylinder is when your piston goes down.
The idea being in between every stroke of the piston when it's waiting for it's new charge before the valve opens already a pocket here as collected in that tube and it's they are waiting undisturbed ready for the next charge just to get sucked in so that makes the engine top gear at low RPMs and at high RPMs it has another advantage too. In the higher roads, it has what called the RAM air effect. Air moving in has velocity to it means it's just travelling, it's dynamic, so the faster you are rubbing your engine or the RPMs are the faster the air is rushing in well since something that has velocity and mass that also has kinetic energy which means the energy of motion that means if you have a mass of air and it's flying along and hit something it compresses against and builds up against in a little pressure wave.
Well compressed air and a pressure wave is good for an engine that means when the valve is closed waiting for the next charge during high RPMs the pocket of air has already moved to pile itself up against the closed intake valve and then when the intake valve opens the air has it's own dynamics of motion and wants to push itself in almost like it's a little bit super charge or pressurized. That's good for performance that good for performance on those old fashion V8 engines that years gone by which I am not too particular found that will be cheap. They had things called tunnel high raises well basically the higher you made your tunnel high raise that better that engine performed at high RPMs so long as you had a Cam and exhaust system that will allow the air to flow out in match sticks you know the tuning properties of that intake system.
Some people like to add power body spacer or carb spacer. If you are going to put one on a fine engine like this may 3.896 minivan future diesel you will take off the total body here with two balls and had spacer right here or close to the intake planum. This short of just changes your characteristics of performance a little bit, it doesn't actually give you any horsepower but it sort of changes the power band notice the good size long runners on this engine, its well designed. Now lets talk about forced air induction systems when we are talking about air induction in tuning cars that flow. Turbo cars and supercharged engines are a compressor they are blowing compressed air into the intake manifold system, runners and planum whatever and so when the intake valve opens a charge of pre-compressed air that's very above atmospheric pressure rushes in and hindered. Most fuel injected cars have what's called a map sensor, it's got a little diaphragm in there and a little chip to diaphragm presses against and it measures air pressures called manifold absolute pressure sensor.
A vacuum holes goes any place to intake manifold so that it can read the pressure in there. If your car wasn't designed to run at pressures above zero PSI, it has a normal map centre that means your engine has not supercharge or turbo charge. Zero PSI may sound confusing but air pressure is actually air pressure. The 16 pounds per square inch of air pressure at sea level pressing down in every inch of your body and every inch of everything. So an engine is running it's not actually sucking air in it just creating a vacuum and air pressure pushes itself in. Well on a typical engine with no forced air induction system you can never get quite to 0PSI where air exists unhindered maximum flow.
So if you were to add a supercharger or turbocharger that gets next farm -- going to destroy then somewhere on the intake system you would have a supercharger or turbocharger adding pressurized air to the planum. Well without a completely different computer, map sensor electronics to this car and bigger injectors this Toyota or any other car would not work properly. The intake mixture would be way to lean, your car couldn't understand pressure is above 0 PSI and know how to give it more fuel or have the capabilities with larger injectors to do it. So your car would work terrible. So if you are planning to add a four steer induction system of any sort to your engine you have to be aware of a map sensor that reads pressures up to say 15 PSI like I run my car on you see four steer induction map sensors have a different range of pressures that they can read some only go up to10 PSI, some 7 PSI, some 30 PSI you never know.
Then you have to have the appropriate computer that can read those different readings it sending it. And higher rate of flow fuel injectors and may be in the gas tank even higher volume, higher pressure fuel pump so unless you are starting with a whole complete kit that was engineered for the engineering using it, you are almost set of luck. If you want to increase the performance on your car by adding sir induction that's forced has likely your grocery won't work right, will burn the valves has white spark plugs, preignition and lots of problems and may be even less horsepower.
Now lots of people have thought of putting a RAM air tube in front of their car and may be even a cube for something like that this is a little more innocuous because it's hidden under the line of the heard. Well if you have a carburetor car that can work out not bad but you may have to rejected for this speeds that you might be driving at when you are using that. So if you have a fuel injected car and it has a good intake system were you are allowing lots of air to RAM and then it's also be confuse the computer and map sensors in cars your car may be not to run too good. There is a limit to how much air you can force in there that your computer can read before it causes your car to run poorly, so you might want to forget about adding a pressurized air system to your vehicle without doing serious modifications and having a understanding of electronics.
Unless you are a guy like me and you can pretty much pull off anything. One final thing if you manage to get a kit and you get it all working right and you have a typical engine with a steel crank, I mean with -- steel crank shaft with a cast iron crank shaft with a low volume, lower pressure, oil pump you know with the weaker pistons that they come with stock that they are made of cast aluminum. Well, your engine probably won't last long you will damage the crank shaft, skin bearings, crack pistons may be even bend rods, it's almost waste of time to build up an engine that isn't designed from the bottom end up.
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