choke tubing to carb

[uncletee52]

i have a 1972 f100 pickup and had taken the tubing of the carb to the exhaust manifold for choke . what year was the last year that ford used this on a 2100 carb.

[fordman]

you can get new stove pipe someplace if you ned it. i dont know what the last year was that they used it. i think the first year was 70 in the trucks.

[Dragon]

They stopped using heat tubes on trucks when they stopped using the carb.

[uncletee52]

do you know when the last year was they made the carb.thanks

[ToughOldFord]

Been a while since I looked, but there used to be a universal kit in the HELP section in the parts stores.

Just a guess, but I'm going to say that carbed was used 'till the early to mid 80's.

[Dragon]

I found a carb on a 351 F250 in 1988 but that was a Colorado High Altitude and Alaska truck.

F150s and rangers were fuel injected in 1986. And E series with 460s had a cylinder cut out Fuel injection system for a short time that year. It did not save enough gas and owners complained the lack of power when they first punched it to pass.

[uncletee52]

how hard is it swap to a electric choke on this 2100 autolite.

[fordman]

i think you just bolt it on and wire it up. i am considering the same thing. but i want to hear more about how they hook up too. i know to wire it you run the wire to the stator terminal on the alternator. i dotn know about any linkage changes. im not sure there are any.

[Dragon]

how hard is it swap to a electric choke on this 2100 autolite.

If you have a hot air choke the cap comes off and the electric cap goes on. Instant electric choke it just needs wired. I never wire to the stator. You want to confuse the regulator? I run my hot wire to the ignition Red Green wire before the pink resistor wire. The ground wire stock goes to a carb screw but you can ground it to anything.

This will convert an autolite hot air choke. http://www.holley.com/45-226.asp Or
http://www.autozone.com/autozone/catalo ... ccessories

[fordman]

so it will mess witht he regulator operation if you hook it to the stator terminal?

[Dragon]

so it will mess witht he regulator operation if you hook it to the stator terminal?

The regulator depends on small amounts of current at 12 volts to control the Voltage and Current of the Alternator. We are talking about 1 amp max. The heater in a choke is .4 of an amp at 12 Volts so 3 watts. If you steal .4 from 1 amp the .6 that the regulator sees has to be ramped back up to get the proper output. Ramped up to more than it was set for. This causes the Alternator to put out the wrong current for rpm.

Look at the 69 Charging starting and gauges #2 schematic. The unnamed wire on the alternator is the stator, F is field (rotating) B is rectifier output. The Stator gets tapped in the near center of it's windings and has one excitation coil that is regulated as the field rotates inside of the stator it gets charged by the excitation circuit. That is the stator wire feeding the excitation circuit. Remove 40% of the excitation circuit and you lose 40% of the alternator output.

Holley said to use the stator wire long after our puny little 65A alternators were gone.

[fordman]

ok i see. i was told (and im not questioning you) that the alternator just need a qucik one tiem excitment to start charging. so you are sayign alternators have to have constant or peridic excitment whiel doing theier job. this is when the alternator is contiuosly running. without he engine being shut off.

[ToughOldFord]

The problem with using a keyed hot is the choke is going to warm up whenever the key is on whether the engine is running or not. The stator terminal is perfect for choke use since it is the only supply that will be hot only when the engine is running.

[mlheppl]

Holley's electric choke installation instructions say to connect the + terminal to any ignition activated 12V source. They caution not t use the 12V side of the coil for your power source. they say that connecting the + terminal to the coil will result in unacceptable choke operation, and could result in misfiring resulting in possible engine damage.

I know that connecting to the coil was not mentioned, I just felt it proper to include their warning. I tried to link to their instructions but they were in PDF and I couldn't make the link work. However if you do a google search on holley electric choke installation, you will get a link to their installation complete with pictures etc...

[ToughOldFord]

Well actually I was considering wiring it to my brake lights.