Carb Intake - Cold air or Short ram LX - DX

[A20A1]

It's a bit smaller then I wanted... I couldn't get 3" pipe at the time so I used 2.50"

1.50" Secondary bore @ Throttle plate
1.25" Primary bore @ Throttle plate

so a 2.75" - 3.00" is the best bet.

As for the larger opening... when you go from a small area to a large area the air will slow down... but a if you have a slightly larger area then the intake opening it will help draw in air.

the intake is hardly a good idea for top end... a velocity stack would be better... but space is limited to those not willing to cut holes in the hood.

[mindlos]

So convection in the big box = bad. Straight through = good! How did I miss that? Oh, Mike, I was actually pointing out another bad about the airbox rather than your setup.

BTW, your calculation is not quite straightforward but still put you in the clear. Assuming equal air flow and velocity at the bores total compared to the piping, low theshhold for restrictive air conduit I assume, you can add the cross sectional areas of the bore then use that total to find the minimum desireable pipe radius.

sqrt ( ( pi*1.25*1.25 + pi*1.5*1.5 ) / pi ) = 1.95"

Since the world aint a perfect place it will have to be higher so I would say you are good there at 2.5". Its also not worth the calculation anyway since you always want to overshoot. I'm just compulsive I guess.

Oh, restriction of air flow in a passage is related to the surface area to volume ratio, which decreases with radius/diameter so I guess bigger is always better until you reach some diminishing returns.

Oh shoot me now coz I'm wandering!!!

[shepherd79]

mike what is the vacuum line goes from intake to the carb. what is that for?

[A20A1]

It's another futile attempt to increase the vaccum at the venturi in the secondary barrel.

[A20A1]

Oh some cool/Good stuff I did.

the large vacuum hose that comes with the intake... which is actually from a 1991-1993 Accord not a civic. Well i hooked that up to the large vacuum port on the left side of the intake manifold. and I ran it as far as I could towards the distributor... all that extra area inside the tube helped the vacuum advance out a bit. I also reworked the powervalve... and hooking both vacuum advance ports to manifold vacuum does increase the amount of advance... as POS CARB mentioned a few times before.... I never really notticed the difference untill now, even though I normally do have both hooked up.

[shepherd79]

so what you are saying is you ran a bigger diameter vacuum line from each side of the manifold to the distributor? hmmm, i wonder why it maked so much diff.

[Mantis88LX]

man that looks awesome A20A1, when are u gonna start selling the adaptors????? i neeed one!!!!!

does it help low end? and does it help more than flipped air lid

[Tim Yoak]

One good place to hook up your intake is to use one of the vent openings on the underside of the front bumper they have a snap off grill.

[89accordboi]

Originally posted by Mantis88LX
man that looks awesome A20A1, when are u gonna start selling the adaptors????? i neeed one!!!!!

does it help low end? and does it help more than flipped air lid

dude flipped lids barely help, i dont think i can tell a difference at all despite what i have heard, im not being negative or anything (to those who hate me) but i can hear a throatier sound at idle and high rpms. i cant feel any better acceleration though, but it does sound ok.

[hondaman87]

open carb and automatic secondary rules

[hondaman87]

hey 89accordlxi666 come by my house And i'll let you dive my car and you'll see how much pull ther is on that engine for being an bs1

[89AccordLXI666]

Hey HondaMan87 I'll stop by your house, and take that Sweet Hatchback Accord of yours for a little test drive.... Guy's HondaMan87's ride is definitly insain, it's a sweet ride, and open carb does sound sick in his car, I've heard his car before and it sounds sick. Hey HondaMan87 we got a big project headed our way when I get that 87 Accord soon.... I'll let you know when I get it, so we can set a day to meet up and work on it. ahhh working on the 3rd Gens like the good old days huh HondaMan87.... :lol Lataz guy's and I want to give a big Thank you to my best friend HondaMan87, You rule Man!

[A20A1]

I sometimes run without and intake or filter when I go to tracks

I'll make more adapters if it gets a good review from the person buying it from me

[iloveJDMblackrims69]

LOOKS AWESOME im jealous

[88accordlxcarb]

I might buy one if the price is right, and if it is not i will use your measurments to make my own!

Jason

[meanaccord]

when you take off the stock air cleaner, what do you do with all of your vaccum hoses?And your sensors, i have an already made intake but cant figure out what to do, and if my car is gonna run different

[dXsquared]

MIKE!!! i need a box for a Weber... i have to make a WARM AIR INTAKE... the carb runs horriblw when its like -15celcius... its runs real rich and hesitates and shakes below 2400 RPM.... whats the prob? should i turn the idle mixture in? i get out of the car and i smell like GAS!

Travis

[A20A1]

hmm. if you had heat resistant material... like that silvery stuff used for a turbo wrap. You could drape that over the top of the air filter to the sides of the intake manifold... that way the air would have to pass thru the base of the manifold up to the filter. Also it will trap in the heat.

[A20A1]

Originally posted by meanaccord
when you take off the stock air cleaner, what do you do with all of your vaccum hoses?And your sensors, i have an already made intake but cant figure out what to do, and if my car is gonna run different

What were the vacuum hose numbers/lables that you have to remove to get the stock air box off?

I sort of forgot.

- 5/32" Vacuum Hose, Hot-air door control diaphragm #8
(Metal diaphragm that sits on the stock intake pipe)
*PLUG @ HARDLINE
**NOTE: THIS WAS PART OF A PRE-HEATING DEVICE.

- 5/32" Vacuum Hose #17
Upper Right Corner Near Brake Cylinder
*CONNECT TO NEW INTAKE

- ??15/32"?? Large Vacuum Hose #?
Upper Left Corner Near Charchol Canister
*CONNECT TO NEW INTAKE

- 5/32" Vacuum Hose, Air Bleed A #8
*PLUG @ HARDLINE

- 5/32" Vacuum Hose, Air Bleed B #33
*PLUG @ HARDLINE

- Air Suction Tube (Silencer)
**NOTE: SILENCER REDUCES OPERATING NOISE FROM THE AS-VALVE.

- 5/32" Vacuum Hose, Air Suction Valve #5
*PLUG @ HARDLINE
**NOTE: AS-VALVE MAY NEED TO BE ENABLED DURRING EMISSIONS TESTING.

- PCV System Filter Hose
**NOTE: REPLACE HOSE WITH AFTERMARKET PCV FILTER (Valve Cover Breather Filter)


Please copy and paste if you need to and fill in the "?" next to vacuum hose #.

[meanaccord]

so would i be better to get an civic pipe and fix it that way, or get somebody to bend me some metal and make it cold air. And i am making my own intake adapter to run it. Is my intake going to e as loud as my friends which has cold air del sol?

[A20A1]

the short rams will make a louder sound the the longer intakes... but you need the tube so the intake can resonate, which will make it sound louder.

[socal3rdgen]

remember guys that these adapters are one of a kind and they do take time to make. so i would not even expect to pay anything less then 60-90 USD. its a20a1 call obviously, i also do not know the dynamics involved with such a task. but i do know that the time he takes out for doing this is also time he could be working making his normal pay.

[shepherd79]

i don't even know if he is going to make them.
if he will, ha can charge as much a s he can.

[Mantis88LX]

so A20A1, whats the news? gonna start selling em?

[meanaccord]

I am piecing things together, today i got my fiter and should get the honda intake pipe sometime soon. Its 3 inches so is that big enough to make it loud and bring out peek performance.