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carbuerator cold to the touch?

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ratface

05-10-2004 10:46:23

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I've been chasing a loss of power problem and have inadvetently discovered that my carbuerator runs very cold. It starts to get that white frosting over on the outside. Yesterday was 90 degress outside and it was cold to the touch. Is this normal? Just seems so odd sitting there right next to the manifold, one is to hot to touch and the other is ice cold.

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Randy

05-15-2004 19:36:39

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

I keep my carb a little warmer in winter by rigging up a length of the same heat flex hose used by cars of the 70s and 80s on their air cleaners from the top of the oil bath air cleaner inlet to the exhaust manifold with a piece of same diameter conduit on the end with a strap wrapped around the manifold to hold it on. The inlet pipe and carb are nice and warm in winter and no icing. Try it, you'll like it.

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LarryNAA

05-11-2004 09:16:42

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

Two things cause that to happen, and it's normal:
1) Air in the carb venturi has accelerated, and is moving fast. Fast moving air, runnng over an air-foil shaped surface (like a venturi) has low pressure. (the Bernoulli Affect). As gasses lose pressure, they also lose temperature. (Charle's Law(?), PV=nRT)
2) When the fuel evaporates (in or near the venturi), there is evaporative cooling too.

Put both of these together, add some moisture from humiditiy, and you can get: Ice.

However, the conditions for max internal carb ice are usually higher rpm, with partly open throttle. Common in desending airplanes, but not as common in tractors. But you say you have ice on the outside of the carb. That's pretty much normal, but I'd check for manifold leaks anyway.

Larry, who never saw the use in all this science, until he got a little older.

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RandyinWNY

05-12-2004 10:16:53

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Re: Re: carbuerator cold to the touch? in reply to LarryNAA, 05-11-2004 09:16:42

I have seen this happen on my 8N. In the cold winter the tractor would run good until it warmed up, then it would have a power loss and run like crap. Dell said carb icing and to wrap with foil. I tryed it and have not had a problem since.
....Randy

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Fast Ed Ohio

05-11-2004 00:50:35

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

Weather conditions will do this, some wrap aluminum foil around carb. intake and exhaust pipe to help frosting conditions . dont know if this is your problem or not . Wont cost much to find out .

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Brent

05-10-2004 17:04:21

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

I dont know if this is anything or not. My JD 350 Dozer did the same thing. And I found out I had an intake manifold leak. Suckin air. I put a new manifold on, and it stopped. My 8N doesnt frost up. Not that I know of anyhow. But there is a whole lot of smarter people on this board than me. Good Luck.
Brent

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Eric ATL

05-10-2004 14:21:36

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

That brings back memories. I remember as a teenager tinkerin with mom and dads cars (Dodges) They had heat risers. A flex pipe off the exhaust manifold up into the air cleaner. I always wondered why they did that.

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yes . . . Dell (WA)

05-10-2004 11:05:53

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Re: carbuerator cold to the touch? in reply to ratface, 05-10-2004 10:46:23

Rattzie..... ..yep, cold carburator is NORMAL. Has to do with compression and expansion of gasses (air). Yer car airconditioner works the same way. And yes, in certain climatic conditions when the humidity is HIGH, its quite normal to have a "frosty carb", sometimes the frost is inside the carb and isn't white. Propeller airplanes have "carb heat" for landing and take-off for that reason. Just when you need power..... frosty poop.

I remember driving across the New Mexico high desert and "stalling out" and to my surprize, the carb/intake manifold of my Ford V-8 had so much white frost in June, I'd thought it'd been snowed upon. After setting for about 1/2 hr, frost melted and I was on my way again..... ....Dell, the frosty

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Jim WI

05-10-2004 11:11:15

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Re: Re: carbuerator cold to the touch? in reply to yes . . . Dell (WA), 05-10-2004 11:05:53

The carb in my 80 chevy LUV surprised me by freezing up solid driving down the highway one wet spring day. There was snow coming down so wet that it was almost rain and the air was almost like breathing water.

It's really surprising the first time you look down the bore of a carb and see it plugged with ice...

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Ed S. (IL)

05-10-2004 16:48:42

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Re: Re: Re: carbuerator cold to the touch? in reply to Jim WI, 05-10-2004 11:11:15

For the same reason, all carbuerated aircraft engines have "carb heat." Basically a way to divert air past the exhaust manifold (to heat it) before it goes through the carb.

Kinda makes your heart skip a beat (right along with the engine) when you forget to turn it on and get carb ice 500' above ground on short final...

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