Remember, no stupid questions... I found out that my heat riser tube is disconnected from my choke. Here is my question. What type of chokes are there (besides electric, I know I dont have one of those). Does this heat riser tube work with some kinda automatic choke? I have this huge handle in side the car below the headlights/wipers. I assume that is for a manual choke? Do i need the heat riser if I have that huge manual choke handle? Or do they work together some how? Thanks.
From the pictures you posted, I think you have an automatic choke. That big handle is the parking brake.
A manual choke doesn't use the heat riser, it is opened and closed with the cable. It is the simplest form of choke and gives the driver the most control over the amount used and for how long. The down-side is that if you forget to shut it off it can run rich enough to wash the oil off the cylinders and foul plugs.
Even with an automatic choke, you don't need that heat riser. I remove it from almost any vehicle I have owned. With the heat riser tube your still getting heated air at all tempature RPMS fed into the air cleaner.
Speaking of air into my air filter, shouldnt there be a flex type hose connectiong the housing nose to something? Mine just kinda points to nothing.
You don't have to have one. I dont remember if they came factory with one or not (not into factory cars really and never owned a stock one)
Up here, and in Ohio, I'd keep your heat riser tube, you'll need it, if your not use to a carburetor, in cool weather. Ford put it on for a reason.
I believe your original question was about the choke heater tube. You do need this to work for correct choke operation. ITs a small tube running from the choke housing to the exhaust manifold. The heat riser is another component. You will need the heat tube the goes from the exhaust manifold to the bottom of the air cleaner snorkel in our climate. It prevents the carb from icing up when temps get around freezing. Unless of course the car is in storage by then.
Sorry, I failed to read his location. That would make a big difference I'm assuming, but down in my weather they get removed a lot.
Thanks for the feed back. The chock heat tube: goes where in the manifold? I could not find a hole or anything. Its a 170 I6. I assume the hole is near the top of the manifold? Or is down lower? So what is a heat riser then, if its not the choke heat tube? I will be storing it and not driving it in the winter. Would I need the heat tube to the air filter then?
There is a heat riser that feeds hot air into the air cleaner to keep the carb from "icing" in cool wet weather but the actual reason for the hot air is to keep the inlet air at 180 - 200F for better gas mileage and emission control. There is a thermostatically controlled valve in the snout of the air cleaner that regulates the incoming charge to an "optimum" temperature for clean combustion.
Do all cars use that same setup? All the GMC trucks I've seen just had a flap in there, and I always just sealed it off and disposed of the tube. So was wondering if you know if those were thermostatically opened or not as well.
Yes, that flapper valve is controlled by a vacuum solenoid to regulate the temperature. They are no good for performance but are hard to beat for mileage.
Hmm. I have no flap, no tube. Guess i need to find a new filter housing. Im probably missing whatever the air filter tube is supposed to hook too also. is it like a canister?
