theoldsrocket

There is a hose coming out of my Carb going into some thing and the hose reads "anti smog hose" what is this.

Lady72nRob71

A picture might help on this one...
Not much performance gains for pulling off stuff like this, but if the hose goes to the TCS solenoid at the front of the intake, bypassing that can improve general drivability.

Search "TSC solenoid" for more info - a lot has been said about that thing.

joe_padavano

The mind reading still isn't working, so besides a photo, telling us the year, model, and engine would be helpful. In any case, simple ripping off emissions equipment typically will make the car run worse, since the rest of the system is designed to have this equipment in place. There is no magic piece of emissions equipment that, once removed, will measurably increase horsepower.

henryk8398

LOL, another good one from the professor! I really wish more people understood this simple concept.

MDchanic

Now I'm in suspense... I've never seen a hose labeled "anti smog hose," and I really want to know what it is.

Maybe it IS that magic piece of emissions equipment .

- Eric

oldcutlass

Must be a California car, it allowed the smog to disapate so you can find your car in the mall parking lot!!!!

Lady72nRob71

Funny but not far from the truth!
We in dallas are not too far from that...

theoldsrocket

yes it is a California car

theoldsrocket

Pictures

IMG_2423.jpg

IMG_2424.jpg

IMG_2425.jpg

MDchanic

Is that a METAL canister?

I was under the impression that evap. canisters were all plastic, and were located in the front, behind the headlights.

Of course, you don't show us where either of those two hoses goes...

In the middle picture, though, it looks suspiciously like the hose on the right side of the car goes off toward your power brake booster.
The fitting on the hose on the left side of the car looks like the check valves used at the vacuum port of power brake boosters.

Does your engine run relatively low vacuum?

If I were you, I would follow those hoses and draw your own conclusions .

- Eric

ps: sorry for the tone, but... come on...



as my idol: would say, "Throw us a bone here."

theoldsrocket

That canister has 2 hoses one goes into the brake booster and the other one labelled "anti smog hose" goes into the carb. Does that help ?

MDchanic

Yes.

Look, you're telling me that you want to throw out the hose that leads to your brake booster. That doesn't sound like a good idea to me.

Somebody put an extra vacuum reservoir between the intake manifold and the brake booster, presumably because they were having problems with the engine making adequate, consistent vacuum.
What is your vacuum at idle?

This seems like an odd modification to me, because if the car runs consistently low on vacuum, then the vacuum to the booster will be low anyway - it's a reservoir, not an amplifier - and if the vacuum is high enough, then this should be completely unnecessary.
Also, at zero manifold vacuum, this reservoir should be good for one, maybe two stops, tops. Doesn't seem worth all the trouble.

Perhaps another member has had experience with these and can shed more light on the rationale.

- Eric

64Rocket

It was put there because it has a mild cam. It is vacuum reservoir for the brake booster. They must have thought that the cam was to big for the brakes.

Gene

Lady72nRob71

INTERESTING!
So this is not even an emission control device. It was just plumbed in with generic emission type hose.
If the big cam is still in the engine, leave that system intact.

MDchanic

Actually, I talked to him on the phone, Rob.
It sounds like he bought this car with an engine "rebuilt" by the previous owner, but he is not absolutely clear on what was done.
He is very new to working on cars, and really doesn't understand a lot of the details.
He says he was told it has a "mild cam," which I wouldn't think would really need a reservoir, but remember, the previous owner / rebuilder is the same guy who put catalytic converters on it (different thread), and, according to the current owner, the PO got po'd at him when he questioned the need for the cats in a phone conversation after he had bought it.

So, looks like an idiosyncratic prior owner put in some odd parts, and it's not clear whether they were really necessary.

I told him to route the hose right from the manifold to the booster and drive it, and if the pedal got hard, put it back the old way, and if everything worked fine, then get rid of the reservoir.

I still don't get the cats.

- Eric

Bluevista

Those vacuum cans ain't worth the powder to blow them up.
I've been through the whole deal and if you want to have brakes that stop the car in every stopping situation you have to supplement the vacuum if it's low.
Better off with hydro-boost or an electric brake vac pump from an 80's GM 4 banger if you have low vac because of a long duration cam.
I heard that manual brakes work too.

Lady72nRob71

Understand, I talked to him a month or so ago about some different things. He is very young, working on a nice old car learning the details (and doing a darn good job at it, too!
When I was his age, I was just getting into working on go-karts and minibikes, learning the details on those!

MDchanic

You said it better than me .

I said, "It's a reservoir, not an amplifier" - much less catchy!

- Eric

joe_padavano

As usual, a picture is worth a thousand words. That's an aftermarket hose. Some hose vendor has labeled it "anti smog hose" to differentiate it from fuel hose, which is different and manufactured for higher pressures. The label is meaningless.