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Carb icing...
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BajaB
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PostPosted: Sun Jan 03, 2010 10:44 am    Post subject: Carb icing... Reply with quote

I didnt know it was even an issue tell I had it happen last week, but basicly my baja has the heater tubes for the intake cut off... I'm looking at getting a manifold (Lame excuse to upgrade my carb too! Laughing )




It hasn't left me on the side of the road does but anyone have any suggestions on something to fix this while I wait on getting a manifold.. (will be at least a week) I saw on one thread a light being used and wondered if anyone else had any suggestions
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Russ Wolfe
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PostPosted: Sun Jan 03, 2010 11:39 am    Post subject: Reply with quote

Some of the aftermarket manifolds and exhausts look like they have pre-heat, but they are not functional.
I tore an engine down recently, and the aftermarket manifold preheat did not go clear through the lower casting.
And, the Bugpack exhaust it had, where the pre-heat connected, was just the flange, and no hole into the actual exhaust system on either side.
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BajaB
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PostPosted: Sun Jan 03, 2010 11:43 am    Post subject: Reply with quote

Russ Wolfe wrote:
Some of the aftermarket manifolds and exhausts look like they have pre-heat, but they are not functional.
I tore an engine down recently, and the aftermarket manifold preheat did not go clear through the lower casting.
And, the Bugpack exhaust it had, where the pre-heat connected, was just the flange, and no hole into the actual exhaust system on either side.


I'll have to keep an eye out on that, thanks for the heads up.
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larry408
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PostPosted: Sun Jan 03, 2010 12:28 pm    Post subject: Reply with quote

Here is what I did to stop my icing problem.

Image may have been reduced in size. Click image to view fullscreen.

Image may have been reduced in size. Click image to view fullscreen.
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vw_nick
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PostPosted: Sun Jan 03, 2010 12:43 pm    Post subject: Reply with quote

I used a piece of 1.25" rubber heater core hose to duct some of the hot air from behind one of the cylinders and plumbed it to the air cleaner, wired it in place. I cut a slice out of the bottom of the hose to make a little "scoop" of sorts. Kinda like Larry's setup shown above, but I spent about 5 minutes on mine. This was for a 200cfm Bugspra which didn't have any heat risers at all and would ice after about 20 minutes on the interstate, and I work ~50 minutes from home. I used to have to leave early to account for time I spent on the side of the road allowing it to thaw out...
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TC/TeamEvil
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PostPosted: Sun Jan 03, 2010 1:41 pm    Post subject: Reply with quote

Larry,

Slick fix ! ! ! !

Thanks for the pictures, perfectly simple, simple and perfect. GREAT ! !
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larry408
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PostPosted: Sun Jan 03, 2010 2:01 pm    Post subject: Reply with quote

It was made from combined ideas that I found on here. It has been in the teens since I installed it with no icing.
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bajaherbie
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PostPosted: Sun Jan 03, 2010 4:44 pm    Post subject: Reply with quote

larry408, you wife is looking for her cake pan.......
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BajaB
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PostPosted: Sun Jan 03, 2010 4:44 pm    Post subject: Reply with quote

Hmm, I should maybe consider using my air from the cabin of the bug then.. I've got an oil cooler on the inside as a heater Laughing not the safest of heaters, but works. So I could just put my intake near it as the air off it gets pretty hot.


How warm do you think your intake setup makes the air larry?
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larry408
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PostPosted: Sun Jan 03, 2010 4:48 pm    Post subject: Reply with quote

SHH, do not tell her!!!
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thefladge
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PostPosted: Sun Jan 03, 2010 8:41 pm    Post subject: Reply with quote

Russ Wolfe wrote:
Some of the aftermarket manifolds and exhausts look like they have pre-heat, but they are not functional.
I tore an engine down recently, and the aftermarket manifold preheat did not go clear through the lower casting.
And, the Bugpack exhaust it had, where the pre-heat connected, was just the flange, and no hole into the actual exhaust system on either side.


Those need to be drilled through if you plan to use them for pre-heat of the intake manifold. Most of the aftermarket exhaust systems I have seen are like this. People running dual carbs need not do this.
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Bruce Amacker
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PostPosted: Sun Jan 03, 2010 8:53 pm    Post subject: Reply with quote

BajaB wrote:
Hmm, I should maybe consider using my air from the cabin of the bug then.


This might not be a good idea. IH trucks in the 50's used cabin air for their carb source and froze the drivers out of the cab. The engine efficiently removes all heat from the cabin area.

Happy New Year!
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BugMan114
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PostPosted: Sun Jan 03, 2010 9:30 pm    Post subject: Reply with quote

I'll try to get some pics later, but basically all i did was take a fresh air hose (like the ones going from the shroud to the heater boxes), clamped one end on the carb (its the same 2 inch sized opening, lol), and took a small K&N air filter that looks kinda like this:
Image may have been reduced in size. Click image to view fullscreen.

mine is small, like 2.5 inch diameter, with a 2 inch opening, and like 2 inches tall.

anyhoo, i cut an outlet off an old muffler i had, where the fresh air hose normally clamps onto, stuck it inside the fresh air hose from the carb, and clamped the air filter on the end of it (so when i tightened the clamp on the air filter, the clamp wouldn't crush the hose), and stuck it between the pushrod tubes, and ski slopes (the tin on the bottom), so it gets all the hot air comming off the cylinders and heads. Works great, and looks pretty clean as well. the only problem i had was that the hose was rubbing against the lip on the cylinder tin (because i don't have the long rear tin piece that covers the crank pulley). the lip would rub against the hose, and cut it, letting cold air in, and when it got around 15 degrees outside, it was enough air to ice the carb up, so i took a small piece of metal and used electrical tape to wrap around the tube, then wrap the metal piece, so the tin would rub against that metal piece. worked pretty good. and been running it like that for over a month now with no issues. i'll try to get some pics later.
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BajaPete69
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PostPosted: Tue Jan 05, 2010 12:32 pm    Post subject: Reply with quote

Could you post some pics? I'm trying to get as many ideas as possible, but knowing me, I won't get anything put together until winter is over. Laughing
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PhillipM
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PostPosted: Thu Jan 07, 2010 9:19 am    Post subject: Reply with quote

Run about 5% IPA in your fuel, stops it icing up.
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Gary Massin-Ball
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PostPosted: Thu Jan 07, 2010 10:30 am    Post subject: Reply with quote

There's always this!

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Cheap and easy! I think all of us has one or both of these in the junk pile.
Gary.
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