Do Cold Air Intakes Increase Horsepower?
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- čas přidán 12. 03. 2013
- How cold air intakes work. How do cold air intakes increase horsepower? What is the relationship between air temperature and horsepower? This video explains the theory behind cold air intakes.
Note: This video assumes pressure remains constant for all situations, and that air density is strictly dependent on air temperature. This video also assumes air is dry, containing 79% nitrogen and 21% oxygen.
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Not gonna lie, spaced out a bit while u were teaching. Will rewatch the video
Shaun Whitehair Some times I'm monotonous. I make up for it when the cameras are off. :)
Shaun Whitehair Me too dude, I've learned a lot off of these videos and some of them have also helped with my insomnia. It's a win win situation, thanks Engineering Explained!
thought that was just me.
+Shaun Whitehair 3.3%
+SpaceManSpiff 03 That's his plan. More views for him.
I graduated with a BS in mechanical engineering. Most of my videos I've learned myself by reading and watching everything I can find on autos.
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I ran a duct from my intake, out through the hood , wrapped it around to the inside of my open drivers window to just in front of my A/C outlet. I blast air conditioning freezing air into it and get 100 extra horsepower
Bingo Bango leems segit
Genius
Bingo Bango holy crap someone tht actually knows wtf he's doin lol
or you install a turbo
Wow. So hows the perpetual motion machine coming along?
Feel free to ask questions - I try to make my videos clear to any age group. That said, many things can be confusing if not watched in a particular order, or without pre-existing knowledge. I try to make videos which explain all of the details that work as a system, rather than individual videos that repeat information. Let me know what questions you have, and I'll try my best to help.
I have learned more from watching 10 mins worth of your videos than I learn in a whole 7 hour school day
Lol right? What teachers should actually be doing right here. I took 2 years of auto class in high school and this guy taught me more than any of that.
Ong
They don’t teach you about cars for 7 hours in school. Maybe that’s why genius.
Thats the most ignorant comment of all time
@@TheBanjoShowOfficial in my country where the type of high school i go in, has the option to teach a profession sich as engineering, electronics, medical stuff and more. That might sound good but in reality out of 7 hours (in Wednesdays, where we do only engineering stuff) they took 4 hours to explain how a clutch works.
Best free teacher ever. Need to make myself a plaque!
I tried to keep it pretty simple, it's always good to learn new things my friend!
You're very welcome, thanks for watching!
Yes, they have an excellent video on the subject, hence I tried to take a different approach.
Haha me too! Glad you enjoy the videos and learn from them!
Rain water shouldn't be too much of a problem, but if you were to ever run over a puddle or get into decently deep water, you could risk hydrolocking your engine - filling the cylinder with water and then braking the weakest link, usually the connecting rod.
Glad to hear it, thank you!
Yes, the volume remains the same. All I'm saying is that 4 liters of air at 300K has the same amount of oxygen as 4.13 liters of air at 310K (with the given assumptions). Thus, 10 degrees equates to 3.3% more air.
Just confused. Aren’t we supposed to feed cold air not hot air, hence the cold air intake system. But based on your ideal gas eqtn, you actually heated the air by 10C not cooled. 310k -273 is 37C.
Volume sir is not MASS.
As mentioned before, the automotive engineerings who design the air intake system do a good job at designing the intake system to meet their goals. However squeezing hp out of the engine is rarely their goal. In most modern application emmison rules drive a large majority of the design. Another large concern is sound level. Even performance cars have fairly low intake noise. Therefore, cold air intakes increase horsepower by changing the design to focus solely on performance. Some of these gains are from decrease charge temp and others are from improved flow characteristics.
Basically, pick whichever you would like. Based on what I discussed in the video: 10 degrees cooler = 3.3% more power; 10 degrees warmer = 3.3% less power.
Awesome, thanks for sharing!
Thanks for subscribing, cheers!
What parameter would you change in order to make the most of a CAI? Shouldn't the ECU know when there is more oxygen present?
Most of the restriction is the paper filter element and tiny stock snorkel intake opening. For manufacturers paper elements are cheaper, and the small inlet opening to the air box is in the interest of quietness. So if you use a wide-open high flow filter located in a separate cool part of the engine bay you can get a 5-10% power increase and a racy intake howl when the revs get up. Cooler air is denser and contains more oxygen.
you are well spoken and clear, I just stumbled on your site. nice work!
It is a shame that most kids that put these on their engines have them installed to pull in under hood temp air. Completely defeating the purpose of it.
***** I think you are referring to an intercooler which is different. An intercooler is designed to lower the intake charge after it has been heated by forced induction.
@@walkerscranger No, I think ScannerDanner is actually referring to removing the stock air filter system and replacing with a cold air system. Putting an open air filter inside the engine compartment without getting outside air will use air in the engine compartment. That air will eventually warm up and expand.
@@MrHarr0073 The person I was referring to has been deleted or remove their comment. I was not replying to Scanner Danner, it was some @***** person. I teach automotive classes at a technical college and I see tons of students doing this misleading addition to their vehicles. I tell them there is no such thing as cold air going into the intake... only ambient air if it is picked up outside of the engine compartment. Yes, the market calls it "Cold Air Intake" but like anything else people take it literally without investigating.
Thanks, please do!
Interesting, thanks for sharing.
Thanks for subscribing!
Great video however, keep in mind I have to take off my boots just to count to 20.
Underrated comment
What are you going to retune? The engine can calibrate A/F ratio accordingly based on how much air is coming in, as well as using an oxygen sensor to close the loop. It should be a fairly automatic process.
It's good to see you still posting videos. I have learned a lot thanks man.
It's basically the volume of the engine (the amount of space displaced by the pistons). Check out my video on engines. Obviously larger engines have the potential for more power, but you want to size the engine based on what you want the vehicle to achieve (high power vs good fuel economy, etc.).
for Honda guys, instead of putting the metal tube for a cai, or short ram, just get a factory type r intake tube. it has smooth walls and radius. don't let the outside fool you, it flows very good, then just put your cone filter on it, and get fresh air from outside of the engine bay, then get rid of the lower portion of the air box because it's very restrictive, and you lose a bit of unneeded weight too. for added smoothing of the air, get a velocity stack, they aren't heavy, and it helps smooth out the air
Thanks Mike!
You are correct.
You could just leave it as is, or some make splash guards for the filter to prevent any issues.
Same amount of air by volume taken in, more air by mass since it's more dense. You are correct.
It might suck up a curious kitten and you'll get a cat-back exhaust.
Perhaps, though turbochargers typically have intercoolers to cool the intake charge.
If it is moved away from a heat source (the engine). Most cars do this anyways.
Lies! I checked your channel, you've been subscribed for a month. Cheers
Probably so, yes. Check your electrical system as well, plugs/wires/distributor. Obviously if there's a check engine light that would help.
Ultimately I would say most are pointless unless the factory tubing is restrictive - I would guess that the vast majority are not restrictive, and that the only "positive" (for a car guy) effect of a SRI would be a louder engine - but this is simply because the silencer box has been removed. They may be of more value once the engine is more heavily modified and requires more air - possibly.
I simply explained the logic hear. It's very likely that many times you won't gain anything. It's important to find (or create) good data showing the improvement.
Depends if the fitting is the same. If it fits properly it could still work.
I believe you mean large bore vs large stroke, displacement remaining the same. Likely longer stroke would ultimately give more torque, but with a smaller stroke you can typically rev higher, thus creating more power. That said, there could certainly be engines which do the reverse of what is typical.
Awesome video man! love the theoretical explanation!
Did you ever get it dynoed?
If only I had a vtec and dyno at my disposal. Any donors? :)
Not exactly sure; could be EGR or just a way to heat the engine up. Warm engines are more efficient.
they normally do not workas well as they say they do. a buddy of mine did test on a Dino and found some awesome results. (5 runs each filter. giving you the average) he started with a cheap frame air filter, 208 HP. next he used a K&N high flow high filter, 215.5 HP. took out the stock air box and installed a cold air intake made by K&N, 215 HP
Toyota Tacoma
So a high flow air filter did the same as a cold air intake?
@@StoicOutlaw17 A stock air box will almost always provide colder air and better airflow than an aftermarket intake. It is only recommended to buy an aftermarket intake when an intake that houses the filter and MAF/MAP sensor is not present. A K&N stock filter replacement will flow just as much air as any pod filter. So if you have the stock air box and the engine is N/A then spend $50 instead of $200.
I simply subtracted 1 from 1.03 to find the percentage change.
It acts as feedback to close the loop on the system. If there is oxygen left over, the ECU adjusts accordingly.
Perhaps, it relates to thermodynamics.
I love it, its oil burning tendencies and all. :)
Why?
Is it worth trying to combat heat soaking of of the cold air intake system. Pulling in the cooler air (relative to the engine bay) is good but the CAI gets heated by the engine and warms the air being pulled through.
Theoretically it could increase fuel economy if thermal efficiency was improved with more oxygen burning, but the opposite could hold true as well.
Let me ask you this. My car has a long ass plastic tube, running from the back of my engine compartment, to the front of the grille. I’ve been told that the air flow/pressure works better if it has to travel a long way. But wat if i take out all of the piping, and put a smal pipe straight up directly through the hood and smooth it out with the hood. I mean the air doesnt have to travel all the way through a pipe in a warm comportment. But gets injected cold directly.. any idea’s?
I wouldn't say most CAIs have no bends. Larger piping perhaps for high revs.
If I want to change air intake on motorcycle, with stock throttle body and no mods on exhaust, and I don't want to gain more horse power, do I need to do tune, dyno for the bike ?
This is the best channel I've ever subscribed to. Keep doing what you're doing!
Im trying to improve my performance on my 2012 lancer gt cvt.... What should i do?
Your videos are GREAT! You have all your information prepared so you don't "uuumm" and pause at all, keeps it interesting. Good work, thanks for the videos!
Hello i got a question. My intake manifold has a leak or needs a gasket. Being that im low on cash right now to fix it. Will a cold air intake help reduce the heat of my engine temporarily until i get it fixed. I have a 2002 saturn sl2
Thanks man! Keep up what you're doing !
Hi, i have a 2018 Mustang ecoboost and i see some retailers claiming à power gain in installing a cold air intake because the OEM septup is too restrictive. I find it hard to believe that a turbo engine would be able to breathe more air with a CAI than with the stock airbox and filter. Can CZcams help me clarify this Matter ?
I just visited your website. You have good lessons on there! I'm an IT guy so I mostly tinker with electronics of that nature but I really enjoy learning all you share about cars almost as much as I enjoy learning about IT.
I love running my car in the winter at night! My engine temp stays at around 200 degrees and it pulls strong all night long. When that California heat kicks in, I don't even bother because 2-3 pulls at WOT and my engine temp creeps up to 225! And immediately I can feel my power drop off! So yes, your deduction is correct. A sports car, and actually, any car, will perform better in the cold because it is getting cold dense air!
It just feels better and fuller to breathe cold air over hot air in general.
My question is if i had an air box for my intake would it create gains? minimal or substantial? if everything installed/tuned properly
what if you ran a pure oxygen line into your intake tube with an adjustable nozzle, would it work similar to nos, but not as powerful? since pure oxygen is more volume of oxygen and its combustable
Is it going to increase the HP if we expose the intake to the AC evaporator?
Thanks
I'm always happy to see your videos!
My buddy's got the same Acura, he took out his headlight and converted it to a ram-air style intake :p
Thanks for the reply. I love your channel, keep up the good work!
So basically, Cold air intakes to Naturally Aspirated engines are like intercoolers to a turbocharged engine?
Isn't there anything to make the air cooler than the ambient air? Like a separate channel for a radiator, like to ensure more cooling?
How about if we buy performance air filter from KN will it work ? Because I couldnt find any cold air intake for 1.8T passat
I think the volume is the constant, "n" is the one that varies.
Still the results would have been the same.
So is it worth for a 160cc 15hp motorcycle?
You could likely remove the air filter box and have the same effect. That said I certainly wouldn't recommend it as the filters are likely cheaper.
Just the video I was looking for. Thank´s. Great video, and channel!
Thanks, glad you like the channel!
I have seen system that have a "flap" that redirects hot air (from the exhaust manifold) to the intake when engine is cold, and until it warms up enough. Why is that?
Awesome video it all made sense I'm actually glad to have taken chemistry now!
Question, I have a stock engine, planning on buying a PRL Cold Air Intake, what should I do before and after installing it? I've heard that do a reflash with the flashpro before will help me, and I also have heard that tuning the car after is not necessary but I don't really know what to do, so what would you recommend me to do before and after installing the CAI to get the most of it? and thank you for all ur videos, they are really helpful!!
I have a 4 cylinder turbo engine. Would you reccomen a cold air intake?
Does anyone know, do you get more bhp from a different air filter???
Has it been proven on the rollers???
@ 661easton89
yes it does. i gained 2mpg city and 4 hwy . k&n cold air intake for a 2013 tundra.
Ice cans have been used by racers also blocks of ice on intake to cool the air into carburetors some run copper tubes around ac lines to freeze air in the intake tubes as well . ever notice you get better mpg when it's cold and raining?
Well, you'd have to know the oxygen density at different tempperatures, but yes there could be a small difference.
How sensitive is the output power to the change in (outside) temperature?
So in theory cold air intakes provide an increase? trying to produce prevailing temperatures below the engine compartment or equal to outside temps, a 50°F (10°C) change is quiet significant and doesnt appear to be feasible. Is this correct?
I was just driving in the polar vortex here in the Midwest with -20 f before wind-chill and my ait was -5f and my car didn't feel noticably faster, after that experience I won't bother with a cai again, but they can make ur car sound nice.
Hi, would you make a video explaining intakes heat shield, how important they are if they are and how it works...thanks
does a cold air intake have more effect on a turbo diesel ?
But ehat about the milk jug that comes on most Subaru's intakes? Does it in fact make a performance difference when removed?
Finally. Someone that deserves the amount of subs he has. Great video brother. 10/10 explanation.
Do you have a video explaining the purpose or value of an intake resonator?
so, the colder the temperature of outside will result in higher horsepower?
i know this might be a stupid, please enlighten me
There was a company back in 2002 2001 that made a cryo intake system don't know if they are still surround
What about in a WRX 2016? This kind of car it's already improved in the intake and the placement. So what's for REAL the kind of MOD to feel any difference other than sound from intake or exhaust? Just ECU?
Don't have a video on twin-chargers yet. Or twin-turbos. Or twin-scrolls. Or VGT's. Haha, I've got some work to do on forced induction.
My car is a non-turbo diesel engine with no intercoolers. Any suggestions to increase power?
Mechanical engineering, most of this stuff I've researched on my own though.
is there different cheap and expensive airintake?
I believe EcoBoost just means turbocharged and direct injection. Allows for more power in a smaller more efficient package.
ok my 93 teg GS would turn off immediately after i turn it on yesterday and that was the 2nd time that happened in 2 wks. i checked online and looked at my air filter and found out that the housing isnt even fastened to the filter and there is no base for the actual filter to sit on. its just there in the space. its been like for years probably, wouldnt that effect the quality of air coming in and clog something up? plz HELP.