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Old 08-25-2006, 10:49 PM
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Electric Choke

What happens if I do not provide 12v power to my electric choke?

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Old 08-26-2006, 01:16 AM
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Originally Posted by ffcagle34
What happens if I do not provide 12v power to my electric choke?

Thanks

Doc here,

The Choke does not open, it runs extremely rich, fouls the plugs, and basically runs like crap in a can while returning about 4 MPG..

On the other end of the scale, If you wire the choke open, It will become hard to start in cold weather, and may after a long sit in the cold , leave you waiting for a jump start in a mall with a weak battery.

Traditionally , The Electric Choke is wired through a relay driven from the Alternator Field wire..
  • relay coil to field wire #85
  • relay coil to hard ground #86
  • Normally open to 12 volts switched, fused. #87
  • Center-wiper to the Choke Heater Element. #30
  • 87a not used (unless you want a choke lamp)



In this configuration, the choke only begins to open IF the alternator has an output..(Engine must be running) . In this manner, the choke can not open should you happen to sit with the key on, not running, for an extended period of time..(Clearing windows, Buckling Kids in, listening to radio) Defeating the purpose of the choke.

Doc
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Old 08-26-2006, 05:03 AM
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Electric Choke

Doc,

My experience with electric chokes has been on marine 2-strokes.

Outboard engines use a solenoid to close the choke, on power applied.

Thank you for the sharing your education!

Jon P
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Old 08-26-2006, 05:14 PM
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Doc here,

Well, I've learned something too...

Having limited exposure to Marine Apps..I assume with a solenoid it's all or nothing at all..on the choke, as opposed to the gradual opening during warm~up (usually 3 minutes) on a heating element? Or do they use some kind of mechanical detent system (steps) to open/close?

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Old 08-26-2006, 05:37 PM
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Electric Choke

Doc,

Jon here

The 2-stroke marine engines (with electric chokes) that I have wired on get either full choke, or nothing. Typically the ignition switch is coupled mechanically to a separate set of momentary contacts (actuated by pressing the key and cylinder inwards) that when closed, slam the solenoid on and full choke is applied. The choke butterflies have a small air bypass hole in them. The key can be turned independently of the momentary contacts; the choke contacts only have power when the key is in the "on" or "start" position.

The solenoids "bang" on actuate, and you can hear the butterflies smack closed through the fiberglass engine cover.

I have seen a staggered choke on a boat, but I did not get to see what made it work. Probably a detent switch and a multiple coil solenoid, like you mentioned.

The "all or nothing" choke has flooded many an outboard. On a medium temp restart, those unfamiliar with the need for just a touch of rich mixture would hold the choke closed and crank and crank. Johnson and Evinrude used these, and Alan Jackson mentions this type of setup in his hit song.

It seems to me the electric choke wire to the field on the alternator is very smart. I do recall seeing a "choke lamp" and did not know why it worked. Thank you for expanding my knowledge!

Jon P

Last edited by ElegantInventor; 08-26-2006 at 06:15 PM.
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