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Questions tagged [air-intake]

The point at which air enters the intake tract of a motor vehicle or stationary engine

29
votes
7answers
15k views

When is a cold air intake system beneficial?

Cold air intake must be one of the popular mods there is, and one subject to the most controversy as well. Manufacturers of such systems advertise 5-20 HP gains, yet there are claims that this mod ...
18
votes
7answers
9k views

Why or why not increase engine efficiency by running the car “fuel-lean” (using a turbo or supercharger)?

Everyone wants their cars to use less fuel, right? I read the following passage about running the car fuel lean from this website: Run the engine fuel-lean, that is, use excess air. It is well ...
15
votes
2answers
2k views

Yamaha R1 intake tract configuration

Interesting Configuration The Yamaha R1 has a very strange intake design. Notice the intake horns in the image below. They sit above the throttle bodies and are not attached directly to them ...
14
votes
3answers
46k views

What is the difference between a MAP and a MAF sensor

Generally a car uses either MAP or MAF to determine the air flow index the engine is getting and that older cars used to have MAP and newer ones often use MAF and cars like the Mitsubishi EVO uses ...
12
votes
6answers
20k views

Cold Air Intake and Engine Wear

I'm contemplating whether or not to retrofit my car with a cold-air intake and performance air filter. Will doing so lower the lifespan of my engine? That is to say, increase likelihood of engine ...
12
votes
2answers
8k views

How do variable-length intake manifolds work?

I have heard many vehicle manufacturers have been using this to improve power and torque figures. They do this by altering the length of the manifold, I am hoping for better diagrammatic explanation.
12
votes
3answers
10k views

Cold air intake causing rich condition

This is a follow up question to my initial question which can be found here : LTFT and STFT values are off and don't make sense Car is a 2015 F10 M5 Mods : Cold air intake, aftermarket rear ...
10
votes
2answers
655 views

Why Have More Than One IAC Type Device On an Engine?

I've had two Mazda's, a 97 323 and 98 626. On both these car's engines there was only a single IAC mounted on top of the throttle body, and no other device for adding air flow on the intake side. ...
9
votes
3answers
28k views

What are the pros and cons of installing a high-performance air filter on a bike?

What are the advantages and disadvantages of installing high performance air filters (K&N,Green cotton,etc.) over original filter? What are the changes/working occur internally?
8
votes
7answers
1k views

Do air filters purify air better with age?

I have been reading in a few places that air filters get better with age, is this true? And how much better? Would it have any effect on quality of the oil or make oil dirty faster? Or is there ...
8
votes
1answer
798 views

What is this U shaped tube sticking off the intake hose?

On the intake hose for a 2001 Honda Prelude SH there is this U shaped tube with one closed end (sorry about blurry shot): (The tiny thing sticking up on the top left isn't a tube it's just a solid ...
8
votes
2answers
1k views

ITBs with a charged engine

Are there any benefits of running independent throttle bodies with a super/turbocharged engine, as opposed to running a single throttle body on the same engine? If so, what are the benefits (and how ...
8
votes
1answer
377 views

Is it possible to extend the length of the shaft on an existing turbocharger, further distancing the compressor from the turbine?

I'm toying with turbojet engine ideas, and over the course of my research it occurred to me that the combustion chamber could be more power-efficient and space-efficient if it was aligned in the ...
7
votes
1answer
104 views

Dirty air filter seal

Whenever I have had work done in the past that I can't perform myself, timing belt etc every garage I have been too has made a real mess with my air filter. When I check the filter there is always ...
6
votes
2answers
2k views

How much horsepower to expect from a cold air intake in Dodge Ram

It's a 1999 Dodge Ram 1500 4x4, Laramie SLT, automatic transmission, 5.9l magnum engine, and crew cab (222k mi). I have a friend who could put a cold air intake on it, with a new hood. But I have a ...
6
votes
3answers
10k views

After Replacing EGR valve and tube: repeat of code P0401 for 98 Accord V6

About 13 months and 7500 miles ago, my mechanic replaced the EGR Valve and Tube and cleaned the intake to solve the low airflow problem. Now I'm again getting an insufficient flow warning with my ...
6
votes
2answers
61k views

Effects of driving through deep water WITHOUT hydrolocking (car still bogged down and died)

So, yesterday we had very heavy rains, and unfortunately I was driving in an unfamiliar area of town. I drove through high water, which caused my car to sputter and so I turned around. The car behaved ...
6
votes
1answer
4k views

Oily Sludge in the Intake Manifold

When taking off the throttle body to clean my IAC, I noticed that there was a thick layer of oily sludge coating pretty much everything inside the intake manifold: I have two queastions: How did ...
6
votes
1answer
38k views

1991 Chevrolet S10 - Sputtering, hiccups, stalling, bad acceleration

I'm having a problem with my pickup; It's a 1991 Chevy S10, 2WD P/U, 2.5L I4 engine with around 185,000 miles on it. It's the Iron Duke engine, a throttle body injection motor. I'm not a mechanic, ...
6
votes
1answer
17k views

How to access the Idle Air Control Valve, Renault Clio mk2

I have an idling issue with my Renault Clio mk2 1.2L 2002 - the engine stalls as I slow down at lights and roundabouts etc... I have been searching the web for solutions to this problem, Most answers ...
6
votes
1answer
632 views

Is this a right MAF signal?

I've just bought this MAF sensor for the injection setup I'm going to build, and first I was struggling to figure out how to connect it. It's used for several BMW cars.(E38,E39,Z3) On the connector it ...
6
votes
1answer
586 views

Help me diagnose the cause of this intake valve burn

I would like some help diagnosing the probably cause of this intake valve burn as seen in the picture. 167fmm engine. 229cc OHV push rod type. Now here is the rub. this is engine originally 9:1 CR, ...
6
votes
1answer
369 views

What does a wet intake port (direct injection) mean?

Car: Audi S5 4.2L V8 FSI I have my intake manifold out to clean carbon of the intake ports. When I was removing the port separators, I noticed some were really dry (light grey carbon), others were ...
5
votes
3answers
2k views

Why do most mass-production motorcycles have their intakes facing backwards?

Almost every motorcycle I have seen has its air intake mounted such that it is sucking in air from the direction opposing travel. According to fluid dynamics, if the intake is made to face forwards, ...
5
votes
4answers
3k views

Can 100% calculated load be reached in neutral?

While searching for information about how is engine load calculated I came across this question which contains an equation for the ECU load calculations. As I understand it under fixed atmospheric ...
5
votes
2answers
7k views

Honda S2000 with cold air intake; rain driving

I recently purchased a cold air intake kit from Injen (SP1305P, seen below) at the recommendation of my mechanic and am planning on installing it in my 2001 Honda S2000. However, it is my daily driver,...
5
votes
1answer
548 views

What would happen if i took the throttle plate off my 5.3L V8 engine?

The throttle body helps regulate air right? Can't it also restrict air as well. For example put your hand over your mouth and try to breath in. If I took it off wouldn't I be able to get more air in ...
5
votes
1answer
536 views

Oiling lawn mower air filters

Why does the air filter on a lawn mower need to be oiled? Is it true that major engine damage will occur if the intake air filter is not oiled?
5
votes
2answers
3k views

1993 Jeep stalls on acceleration, floods, hard to start

My 1993 Jeep Wrangler has about 200,000 miles, in good shape. It usually starts right up, but it's started intermittently flooding, so that I have to crank and crank with the accelerator all the way ...
5
votes
1answer
823 views

Where does the Toyota Vitz air intake take air from?

I am just curious where my engine air filter is taking air from. Below is a picture of my car's (Toyota Vitz 2007) engine (not a picture of my exact engine). As I can see, the air filter should take ...
5
votes
1answer
745 views

Planning to fit an oil catch can into my car. Any problems with this setup?

I own a 2007 Ford Fiesta ST150, I have modified it a little, one of the mods is a cold air intake. I want to install an oil catch can setup, but as the PCV vent is behind the intake manifold and ...
5
votes
1answer
4k views

How to clean the MAF sensor on a 1997 Nissan Altima?

I have a 1997 Nissan Altima sedan. I’ve been told the issues I’m having with my car is from the mass air flow sensor. I was wondering how to clean/repair this sensor and contact points the best? What ...
5
votes
0answers
152 views

How much oversize should you target when choosing a throttlebody?

This is in addition to my previous question about throttle bodies. I know it may sound a bit subjective, but I think it has a clear technical aspect, and I have done a considerable amount of homework. ...
4
votes
2answers
540 views

KTM Duke 200, Broken Airbox

My duke generates an odd noise and when I looked under my seat what I saw was an open air filter box because of the broken screws. When I took my bike to the service center what they told was to ...
4
votes
1answer
643 views

Effect of smoke ingestion on fuel injected car engine?

My father asks, can smoke in the air from wild fires cause a fuel injected engine to choke? (He seems to think this was once true for carbureted engines - was it?) My personal guess is that we can ...
4
votes
1answer
8k views

High pitch whistle at a very particular throttle level

The symptom: while accelerating, at a very particular throttle level/pedal angle my engine recently started whistling in a very high pitch. If I let go of the gas or push it in more the sound goes ...
4
votes
1answer
89 views

1991 BMW E30 - knocking when put into 1st

I knew I had a minor vacuum leak, but it got worse all of sudden while at a stoplight. In trying to get through to the next block, the engine started to knock. (My guess is preignition thanks to the ...
3
votes
3answers
951 views

Could taking coolant through the intake filter realistically cause permanent inability to start?

Diagnosing failure to start on a 2001 Honda Prelude SH, still in brainstorming phase. Leaving out list of other thoughts because this question is specifically about this possibility, rather than ...
3
votes
2answers
5k views

What is an oil catch can for?

Some RX-8 owners have been recommending installing an oil catch can, to prevent problems from "overfilling" the oil. I assume this doesn't mean spillover (does it?), but instead, too much oil in the ...
3
votes
2answers
88 views

2012 Mitsubishi Galant SE

So I have a 2012 Mitsubishi Galant 2.4l and I'm looking for a cold air intake system but there isn't one for my car. I've been looking at a lot of websites but there's nothing. I searched and I found ...
3
votes
1answer
990 views

Found a lizard in my car, I have not driven it for 20 or more days

I went on a vacation for three weeks. When I came back and opened my car, I found a lizard in the car. I have had the air re-circulating knob set to ON. I am still guessing how this lizard entered my ...
3
votes
4answers
307 views

Does cooler air improve turbo performance?

When modifying NA cars I've always been advised to try and protect the intake from heat soak from the engine bay because the engine performs better with cooler air. This makes sense. I now have a ...
3
votes
5answers
11k views

What do hood scoops do to prevent water being ingested in to the air intake system?

I'm planning a modification to my 1998 Toyota Corolla, replacing the stock air intake with something along the lines of forced air induction via a cone air filter. Air will be drawn in to the car with ...
3
votes
1answer
544 views

Why is this hollow plastic piece attached to the Karizma's air intake?

I was helping my cousin with a motorcycle teardown a while back (planning for a café racer build) and was puzzled by something on his '07 Karizma. The red arrow in the picture above points to a ...
3
votes
1answer
172 views

2002 Honda Civic Si Air Box

I am about to replace a cracked air box on my 2002 Honda Civic Si. The one question I have is how do I get the old air box bolts out of the old air box top half and into the new one since it did not ...
3
votes
1answer
5k views

Clearing a P0507 on a Dodge Stratus

My 06 Dodge Stratus (4 cylender) is showing a P0507 off of the Torque app. My idle is sitting at near 1100 rpm versus the standard 800. I read up on the code and started looking for a vaccum leak ...
3
votes
1answer
41 views

Focus 2003 1.8 TDCI starts, but struggles to start in the morning

I have a question, well two. Basically I have bought 2003 Focus TDCI but it is struggling to start in the morning? It's not exactly cold, so I don't understand why it would struggle. It has been about ...
3
votes
1answer
63 views

10/89 (1990) Subaru Legacy EJ22 - OBDI Code 45

10/89 Subaru Legacy EJ22. NA. Multiport Fuel Injection. Throwing... Code 45: Pressure duty solenoid (turbo)/atmospheric pressure sensor circuit (non-turbo) Where is this thing located? I ...
3
votes
1answer
60 views

after replacing icv,intake boot,valve cover gasket and return to stock air box from CAI,car will not hold idle 325i 1994

Car will not idle after re-installing stock air box from previous cold air intake. I replaced idle control valve also replaced intake boot as well as valve cover gasket along with spark plugs, BMW ...
3
votes
0answers
186 views

China yy50cc qt-6 scooter fires up but when throttled it will choke out and stall

I can't get it to fully open wide and run. 2013 model, any help would be great. P.S. had a 80 cc modification done and also the jets were upgraded as needed. I'm thinking all my air hoses are out of ...