carb freezing or Icing ?
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Elder User
Joined: Mar 2003
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From: Colorado
carb freezing or Icing ?
I've been trying to find posts about carb "freezing" or Icing" - with no success. Is this a fairly rare phenomenon? I'm a little concerned as I am about to switch out my stock exhaust heated intake for a single plane Clifford, which has NO heating provision. Does climate have an affect on "icing"? It's generally quite dry here. Thanks for post referals or info.
Hotshot
Joined: Aug 2002
Posts: 12,679
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From: BC, Canada
carb freezing or Icing ?
Climate has a definate effect on freezing. Most carb icing seems to happen at just above freezing temperatures on wet days.
If you can keep a Hot Air Door working on your air cleaner that will probably be all you'll need. What manifold are you going to use? In the 60's and 70's Ford used heated carb spacers on quite a few engines. I've seen them in 2 and 4 barrel versions. They have a port on each end of the spacer that the heater hose attaches to. The warm coolant goes through that before it goes to the heater.
If you can keep a Hot Air Door working on your air cleaner that will probably be all you'll need. What manifold are you going to use? In the 60's and 70's Ford used heated carb spacers on quite a few engines. I've seen them in 2 and 4 barrel versions. They have a port on each end of the spacer that the heater hose attaches to. The warm coolant goes through that before it goes to the heater.
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Elder User
Joined: Mar 2003
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From: Colorado
carb freezing or Icing ?
I picked up a used Clifford single plane intake right after my rebuild. I'm just getting around to installing it. Would running the heater hose through a metal tube along the base of the intake be a waste of time?
Hotshot
Joined: Oct 2002
Posts: 18,488
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From: The Big, Oregon
carb freezing or Icing ?
Do a search on E-bay for "heated carb spacer". Chas1234 just picked one up for his 360, and it looks like it's not engine specific. It looks like an EGR spacer, just with coolant lines running through it. But carb icing is a pretty climate-specific thing. There needs to be a good deal of humudity in the air to cause it, along with freezing or near freezing temperatures. It is caused by the expansion of the air-fuel mixture as it leaves the pressure of the atmosphere, and enters the vacuum of the intake.
Freshman User
Joined: Mar 2003
Posts: 44
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From: around Salem OR
carb freezing or Icing ?
Carb icing is most common when the engine coolant is cold, thought a heated spacer does help if their is icing under normal warm driving conditions. From personal experiance I can tell you that you probably want a hot air door diverting air to the intake, I don't have one on my engine and on cold days my idle circuit freezes shut until the engine gets warm, even on dry days. If an iced carb isn't a serious issue though you could experiment and find out what you need to do.
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