CAI, which is better for Civic

[RSX type R]

Injen
or
AEM

[delsolguy]

There is very little difference between the two. Just choose one, it'll work just as well as the other one.

[PoisonFangs]

I just installed an AEM short stack in my civic on fri, and it works so nice. The sound makes me spluge my pants and you do notice an increase in response. I have not used an injen myself but a dude i talked to at AEM said that there is not much of a difference

[kicker1_solo]

not much of a difference, but I'll say AEM

[1995HondaCivic]

Iceman

yep, sorry, i'm the outkast

iceman is better because it is plastic

metal attracts heat

[pric]

like everyone has said not much difference go for the cheapest one that's the better one.

metal does not attract heat it conduct's heat and so does plastic.

[ric]

Originally posted by 1995HondaCivic
Iceman

yep, sorry, i'm the outkast

iceman is better because it is plastic

metal attracts heat

even at idle a 1.6 liter engine ingests more air in one second then could possibly ever be heated from simple underhood heat dissipation.

ive seen dyno's (real ones not manufacturers ones) side by side comparing the two and they are almost identical but the aem usually has a very small gain (less then 1 hp) over the iceman because of its equal sized and shaped tubing as opposed to the iceman which is not. it only leads me to belive that that gap would increase as air ingestion does with a more modified engine.

[RICE GOD]

intakes restrict airflow. go to home depot and get gutter tubing and duct tape. and some raw chicken dump-valves

[pric]

even at idle a 1.6 liter engine ingests more air in one second then could possibly ever be heated from simple underhood heat dissipation.

How do you think a radiator works?

[ric]

Originally posted by pric


How do you think a radiator works?

can i ask what exactly that has to do with anything?

[pric]

can i ask what exactly that has to do with anything?

Sure you can ask. In your statment " even at idle a 1.6 liter engine ingests more air in one second then could possibly ever be heated from simple underhood heat dissipation. " are you trying to say that air temp flowing through the intake does not heat up because it's moving to fast?

If so you would be incorrect. That's why I asked "How do you think a radiator works? " The faster the air flows across the radiator the more heat it disipates and " simple underhood heat dissipation. " is alot more than you maybe think. and if that is not what you meant please explain?

[nemesls_2000]

AEM. Simply for the fact that they've been in the business longer.

[ric]

Originally posted by pric


Sure you can ask. In your statment " even at idle a 1.6 liter engine ingests more air in one second then could possibly ever be heated from simple underhood heat dissipation. " are you trying to say that air temp flowing through the intake does not heat up because it's moving to fast?

If so you would be incorrect. That's why I asked "How do you think a radiator works? " The faster the air flows across the radiator the more heat it disipates and " simple underhood heat dissipation. " is alot more than you maybe think. and if that is not what you meant please explain?

yeah thats exactly what im saying. have you ever ran a car with an obd2 scan tool attached and monitered the intake air temp sensor? at idle there is a very small increase in intake air temps due to underhood heatsoak. at post idle throttle levels and up that temp goes down very quikly and even more so if the initial air you are sucking is colder.

ok lets do this for a 1.6 liter engine

figuring the cfm of air ingestion in an engine is easy its (ci/2)*rpm*ve.

a 1.6 liter motor holds 97ci and idle should be 750rpm with a normal engine operating at 85% volumetric efficiency.

(97/2)*750*.85=30918 cubic inches per minute and there are 1728ci in a CF(cubic foot)
so the 30,918/1728=17.89cfm

now lets go further. now calculate the area of the intake piping for future use (aems for civics are 2.5").
area is equal to pi * radius squared so
(3.14*(1.25*1.25)=4.89sq inches

now lets figure out the flow rate.

thats easy, its your CFM divided by the cross sectional area of the intake tubing so 17.89/.033sqft=542feet per minute or 9 feet per second over any given point. which equals out to be ruffly 6.1 mph.

that is only the velocity of air inside the intake tubing during idle. do you have an idea what how much heat it takes to change the temp of the air moving past it in a given space at that speed or higher? 150-190 degree underhood temps arent going to be enough to do anything near noticable especially with an average crusing speed of 2000-3000rpm making thise numbers i did jump WAY up. also remember this is all assuming underhood air is not your source for air.

now its 3:30 and im going to bed. maybe if your lucky i'll come back on and give some calculations of thermal conductivity to prove how much underhood heat does not actually effect the intake air temps anywhere noticable enough to justify using thermoplastics or polished aluminums etc.. or maybe i'll just datalog some numbers from an obd2 scan tool and post them...maybe i'll do nothing.


oh one thing i forgot to say about your radiator theory. compare the amount of surface area on a radiator to the actual fluid flow and acceleration though it vs. the amount and acceleration of air through the surface area of an intake. you'll be sad to see the intake comes nowhere close to the radiator.

[ric]

oh one thing i forgot to say about your radiator theory. compare the amount of surface area on a radiator to the actual fluid flow and acceleration though it vs. the amount and acceleration of air through the surface area of an intake. you'll be sad to see the intake comes nowhere close to the radiator.

[SleeperCivic]

I like this guy....