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Carb Question
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Gary Burnett View Drop Down
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Joined: 11 Sep 2009
Location: Virginia
Points: 3120 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Gary Burnett Quote  Post ReplyReply Direct Link To This Post Topic: Carb Question
    Posted: 3 hours 55 minutes ago at 11:33am
What causes the throat of the carb where it bolts to the intake to frost up?
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 89018 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 7 minutes ago at 12:21pm
the velosity of the air ( or expansion) going thru it... Like an air conditioner spraying freon thru an orifice.. as it EXPANDS it gets very cold..

Edited by steve(ill) - 3 hours 5 minutes ago at 12:23pm
Like them all, but love the "B"s.
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plummerscarin View Drop Down
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Joined: 22 Jun 2015
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Points: 4037 		Post Options Post Options   Thanks (0) Thanks(0)   Quote plummerscarin Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 35 minutes ago at 1:53pm
Venturi effect. As air flows through the carburetor the reduced diameter causes the air velocity to increase which reduces pressure. This pressure drop has a cooling effect. Adding fuel to the mix cools it even. Moisture in the air condenses and shows as frost on the carb. This frost can build up on the inside reducing throttle opening and causing poor engine performance especially at WOT. Or something like that.
I had that issue roading the 170 home in January a couple years ago
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