Honda Civic Forums banner

1 - 20 of 71 Posts

·
Registered
Joined
·
5,006 Posts
Discussion Starter #1
This article aims to answer all questions about air intake systems, and gives a comparison between the two main types, "Short Ram" and "Cold Air".

Let me explain the basic principal behind performance air intakes first. Imagine you are told to jog around a race track, but you have your nose plugged up, and you're only allowed to breathe through a small straw. The only air entering your lungs comes through this straw.



No matter how hard you suck, only a small amount of air will come in and you will loose breath quickly, because a restricted amount of air is entering your lungs.

But then you replace the straw with a cardboard toilet roll:



Suddenly your air flow is no longer restricted. You can breathe as much air as you like into your lungs, and therefore jog around the track with ease (although you will look a little silly with a toilet roll sticking out of your mouth).

Now obviously this is an extreme example, and with cars a performance air intake will only slightly increase the air flow, but that's the idea. More air is allowed into the engine, meaning more air can mix with the petrol, which means everything happens faster and better.

Now I will take you through the two main air induction systems, "Short Ram" and "Cold Air".

Short Ram intake systems



A short ram intake basically replaces the OEM (Original Equipment Manufacturer) air intake (often called an "airbox") with a short (usually metal) pipe and air filter inside the engine bay. This slightly boosts performance levels in a car by increasing air volume intake.

As you can see in the photo above, short ram intakes are quite, well... short. Because of this, they are relatively close to the engine, which everyone knows can get very hot. So the air that goes into the intake has been warmed up slightly by the engine. I don't want to get into physics, but cold air is denser than hot air, that's why hot air rises. You want the densest air (coldest) possible going in to your air intake, and this is a slight disadvantage of short ram intakes.

When it comes to driving in wet weather or through puddles, a short ram intake is better. They are higher up and closer to the engine than cold air intakes, and so usually keep well away from any water.

Cold Air intake systems



A cold air intake is a system used to bring down the temperature of the air going into a car for the purpose of increasing the power of the engine, and it also allows for higher air flow as explained above.

Cold air intakes are very similar to short ram intakes, but you can see in the photo above that they are much longer. This is because the point of a cold air intake is to catch the coldest air possible, which is not right next to the engine. Cold air intakes usually have their filters positioned at the far front of the engine bay, near or under the grill, where all the air comes into the engine bay before it has been heated up by the engine. This means the air going into the filter of a cold air intake is colder (and denser) then air going into a short ram intake, which is a good thing.

However, when it comes to wet weather or puddles, cold air intakes don't do as well. The filter is often quite low, some so low that if you go through a ford or large puddle, the whole filter can be submerged. This is very bad. If you suck water in instead of air, you have serious problems, and your engine will be flooded.

Conclusion
In conclusion, short ram intakes are cheaper, easier to install, more common and won't get flooded. However the air going into the filter may be hotter than you would like.

Cold air intakes are more expensive, often difficult to install (on most Civics the front bumper has to be removed), hard to come by and there is a high chance of getting water in your engine if you drive in wet weather.

What is best in my opinion, taking all these factors into consideration? Short ram.

So there you have it folks! Any questions, just reply below.
 

·
Registered
Joined
·
5,006 Posts
Discussion Starter #3
I didn't forget it, I just spoke about the main ones instead.

Feel free to write an article on the Gruppe-M intakes. People should know good ones cost around £600 though :roll:
 

·
Registered
Joined
·
116 Posts
nickyboy said:
Ah but you forget the K20 Gruppe M!

Cold air but no hydrolock issues!

It`s the big carbon box on the right hand side of the engine. It draws air from just in front of the windscreen, using a scoop
I got mines for £370 delivered and its all legit, hoya does a forum discount. Well worth the extra money, to guarantee the safety of the car, something the AEM CAI for example cant give. Hydrolock was always a worry and in the end I forked out the extra for piece of mind.

Nick - what strut brace is on the car above?
 

·
Registered
Joined
·
5,006 Posts
Discussion Starter #11
Many different strut brace manufacturers do that kind of sharp box style, could be anyone. It's not my favourite type to be honest.
 

·
Registered
Joined
·
142 Posts
TerryCTR said:
I was thinking it has to be spoon?
It's not a spoon one mate, the plates for bolting to the struts on a spoon are black anodised and flat.

Don't have a clue what make it is though lol
 

·
Registered
Joined
·
1,624 Posts
are there any decent induction kits for around £100-£120? I wouldnt mind an aem v2 but im abit hard up at the moment.
 

·
Registered
Joined
·
142 Posts
Injen gear is considered as good as AEM as far as I know mate, just make sure it's genuine and you're sorted ;)
 

·
Registered
Joined
·
116 Posts
Alec said:
Many different strut brace manufacturers do that kind of sharp box style, could be anyone. It's not my favourite type to be honest.
I know there is better looking about but the gruppe m limits it :'( Ill just need to bite the bullet and order up a spoon one, then fit some pipe lagging so it dont damage the m - will look amazing lol
 
1 - 20 of 71 Posts
Top