jono20

I spent my last hour reading about removing the charcoal cannister and other related topics. Im currrently rebuilding my engine and at the same time removing as many unnecessary parts as I can (from the engine itself).

I understand the importance or the charcoal cannister to filter the fumes, and Im not very comfortable just plugging the lines and letting the tank blow up like a baloon.

Anyways, I dont know many details on the crankcase venting system or anything, or the details of the purge control valve. I know the crankcase needs to be vented, and I know I want the purge valve and the vacuum line to the dynamic chamber gone and plugged.

ANYWAYS! basically, I was wondering if it would be ok to leave the charcoal cannister in place, but remove the line that runs from it, to the engine. I just want the filtered fumes to vent into the engine bay.

After that is done, what do I do with the crankcase venting system, and that means I can plug the vacuum lines to the dynamic chamber right? thanks guys

Aaron Cake

iTrader: (1)

The charcoal canister doesn't really filter anything. It just stores the fumes until the purge valve allows them into the intake to be burned. So if you leave it open, you will still get gasoline fumes in your engine bay.

If you are planning to keep the canister and purge valve (which I recommend) it's easy to hook up. You will see that the purge valve and canister both connect to the crankcase. Just leave that in place. The top of the purge valve goes to a vacuum signal, and the bottom small connection goes to a vacuum nipple IN FRONT of the throttle plates.

jono20

is there any other way to remove these hoses? can I jsut vent the fumes from the cannister out the side of the car? are they THAT potent?

GodSquadMandrake

The problem isn't that the fumes are that potent. The problem is that it needs to be a contained, sealed system. If you had a roll over gasoline would come pouring out of the gas tank vent if you just disconnected the carbon canister, or left the carbon canister lines disconnected. Also if there was a fire in the engine bay it just creates one additional danger.

What you should do if you decide to delete the carbon canister is install a fish stone.



These will allow the tank to vent excess gas pressure, but they won't let gas or very much gas, leak out if you roll over. These just install in the hose that's coming from the tank and you use a fuel system clamp to clamp it on. You can either install this in the engine bay, or trim back the vent hose from the gas tank itself and install it back there where you won't smell the fumes.

Get it?

jono20

how concentrated are the fumes though? if I were to leave this in my garage overngiht, would I be able to breath in the morning?

what about this. if I get a plumbing valve for natural gas or whatever, leave it closed when it is parked over ngiht, but have it open and going into a filter like shown above the rets of the time.

would the pressur built up overnight be of any danger to me or my car?

GodSquadMandrake

The amount of gasoline vapor produced by the gas in your gas tank sloshing around is not really that much. If you left it capped, it's enough pressure to blow off a rubber cap (I know from experience hehe). If you leave it vented it only produces a small odor from the spot where it is venting.

I wouldn't consider it a danger to leave it parked in a closed garage, or even a danger to open flame is you use the fish stone.

Let's put it this way. The amount of vapor coming out of that vent hose is much smaller than what happens when you are at the gas station.

jono20

so if I jsut eliminate the CC altogether and put that small filter on the end (id cut the hose further b ack toward the tank so it doesnt stink up the bay or the insde of the car) ill be ok? and that means I can get rid of the CC?

what do I dso about the crank case ventilatiion?

GodSquadMandrake

So yes you can do exactly what you said. Remember that your car will no longer be STREET LEGAL at that point however and it will FAIL inspections. Also you will have to own up to what you did if you ever try to trade this into a dealership. They will probably ask you and make you sign a form stating you didn't disable any emissions systems etc. The carbon canister prevents poisonous fumes being released into the air and so you are letting those float out. For all I know this is a race car so that is up to you. Information is power, it's just how you use it.

I don't know about the crankcase vent. I'll let someone else handle that since it is a bit more complicated.

jono20

No emmissions where I am, and I never, EVER plan on givivng this car to a dealership. EVER. I hardly let other people LOOK at my 7

Syonyk

I removed the charcoal canister a while back, and while the amount of vapor coming out of the vent isn't that much, it was enough that with the A/C in recirc, I'd get a good solid gas smell inside the car after 20-30 minutes. I'm positive it was from that vent, becasue it disappeared completely when I ran a vacuum line from that vent to vent it elsewhere.

Lessons learned: Don't vent it into the intake. While this seems like a smart place to vent gas fumes, the car flooded the next few times I tried to start it. I just routed it down behind the radiator now, and I don't smell it, and it's out of the way.

-=Russ=-

jono20

cool thanks russ.

Bluebase

What's the purpose behind removing the charcoal canister? Weight savings? LOL

jono20

no. im just on a big remove-everything-that-doesnt-make-me-go-faster-or-stop-faster craze.

gsmithrx7

Good point, it never occurred to me that when the stored gas vapors are pulled into the engine it might cause a flooding incident if you shut it off before it warms up and all the vapor has been cleared from the cannister.

I read that the primary reason for the cannister is to store vapor from the gas tank when parked overnight.
These vapors are purged from the cannister when up first start when the engine is cold.
Is this one of the reasons that upon cold starting the RPM's surge up for a bit?

Deleting the purge valve will stop the removal of blow-by gases from your crankcase. These gases must be allowed to escape, back in the day there was a pipe going down to the slip stream under the engine where the gases were pulled out. Then came the PVC valve which was a one-way valve using engine vacuum to pull the gasses into the intake manifold.

The purge valve works much the same but note that all three types use some kind of vacuum to evacuate the gasses!

If you just leave the port on the filler neck open, there is nothing to pull the blow-by gasses out.

If left this way the gasses somehow will get mixed into the oil and dilute it to the point where it does not lubricate as well as it should.

Under these conditions how often would you need to change the oil.

One member of our forum stated that he always has more oil come out when he does an oil change than he put in! That would do it.

What do you think?