Also it is highly recommended that if you had problems before or can't figure something out to rebuild the carb, it is twenty some years old.
To educate yourself a bit more, link on carb parts and rebuilding it (not specific to 1st gen CRX or 3g Civic but still honda carbs of about the same year.):
http://www.3geez.com...read.php?t=5350
Some additional info links of others:
Scoobiewrxsti devac thread
HONDA KEIHIN CARBURETOR REPAIR
Darkhand Carb mods
Bike Carb setup info:
Bike Carbs
EuphoricBlue bikecarb How- to
Side Drafts:
Official Side-draft mikuni/weber thread - OG Wagon
Weber 32/36 install:
Weber 32/36 - ydennek
I am now in the process of doing a devac, and i'm having alot of trouble finding solid answers, and a good write up as to how to do it, i've searched through everything. So since i am in the process of doing a devac i may as well do a write up. Now i want this write up to be as detailed as possible, with pics, everything so that even someone who has never modded a car can get it done. Also it would help me devac my own car correctly. So i have several questions, and if you just have ANY tip or something that you found interesting, or anything from experience please tell me!
This first pic is my 100% stock engine bay before i started the devac. The red circles show the two black boxes that i removed and all the vacume lines that where connected. The green line shows where the one vacume line from the dizzy to the carb would run <-- more on it later.
These next pics are what i modeled how my carb should like when devaced (if i am correct they are CRXfantic's pics, i hope you don't mind)
1. This one is from the front view of manifold with the carb, it shows two yellow vac caps on, two block off plates, and three vac lines connected together, brown circled one, blue circled one, the third is on the next pic.
2. This pic shows the right side of the manifold with the carb, it shows where the third vac line is connected, with a yellow circle around it. it shows five capped places, one yellow all the way on the lower left one on blue the mid right, and then three bunched close together (top right), with the yellow closest and two blues right behind it. the port that has the blue tape on it is the fuel line <--- don't cap! or just keep fuel line attached.
3. This pic shows the rear of the manifold and carb on top. It shows seven capped ports, a blue all the way on the mid left (same as previous pic). Then on the top mid, there are three from the previous pic that where all bunched together, left to right: yellow, blue, blue. Now right in the middle there is one red cap circled in a light brown color (question about that one later). right under it there are two other yellow caps.
4. This next pic show the left side of the manifold and carb on top. it also shows six vac caps, same three bunched together from the two previous pics, two yellows on mid right from the first pic and one blue above it also from the first pic, i have to check but i'm not quite sure if the yellow directly to the left of the right blue cap is also another vac cap. There is also two wholes that i circled in green all the way to the left.
5. This last pic shows the top view of the carb and the manifold. with eight vac caps, two yellow on the left, top mid has the two blues and one yellow, right mid has one blue, bottom mid has one blue and one yellow. it also shows where the three vac lines are connected with the "T" in the middle.
Now when i did my devac i capped, and connected everything exactly according to this, i even have the same color caps for each part, so in essence this is how my carb looks like in my engine bay except that the manifold is connected to the engine and the fuel line is connected. One of the most informative threads that i've read is this one:
http://www.redpepper...e...20idle&st=0
So now some questions:
- in picture 3 (rear view of the mani and carb) it has the red cap, from what i read isnt that the "gas tank vent line"??? wouldn't capping this lead to bad flooding, and strong smell of gas? well it happened to me.. my carb overflowed with gas so much that i could see half an inch of gas in the carb. So should this just be left open?
- In the last 4th pic (left side of mani carb) i have the two out lets circled in green, if i am correct this is the "fast idle diaphragm" should this be capped? quote from DarkHand: "With the car running, connect a vacuum hose to that fast idle diaphragm again, just the port on the right (looking at the carb from the angle in that last pic), and suck on it! While holding vacuum, blip the throttle a little. This will make sure you're off the fast idle cam in the carb by applying vacuum to the diaphragm. The left port (further from the carb) turns fast idle on, the right side (closer to the carb) turns it off. If still no luck, try holding the choke plate completely open and blip the throttle... Perhaps the choke isn't opening enough." <-- very helpful but when i tried my high idle (2800-3000rpm idle) seemed to become unsteady and go lower then higher and back and forth, so i don't really understand the correct procedure for turning off the fast idle.
- Now i'm wondering about the places where the remaining vac lines should be connected, in pics there are absolutely no vac lines going to the dizzy, should there? also should it be hooked onto the top or bottom place on the dizzy? like this??:
green shows the vac lines, blue the "T"
is there anything that is capped that shouldn't be? or something that isn't capped that should be be?? Any info would be be highly helpful
also, the purpose of the devac is to: make the engine bay alot cleaner looking, better fuel mileage, maybe a bit "peppier" feel? is there more? is this correct?
Also i heard that i have lean out the fuel/air mixture, but i first want to know that everything is where is should before i start playing with that. This is kind of like a rough draft, hopefully with good input i will have enough detailed information to then make another thread with a detailed step by step how to devac.
I hope that this thread will have many pics and be very informative and help other with their devac job instead of stumping around blindly for answers.
Thanks for the help!
Edited by anassa, 05 October 2009 - 11:03 PM.