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Frozen intake

 
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Sun Nov 02, 2008 12:51 pm    Post subject: Frozen intake Reply with quote

I have lived in the south a long time but I never thought it would get so cold that my intake would freeze.

This morning I ran fine for about 5 miles then spit and sputter. I pulled over to find the manifold just below the carb was iced. I assume that the spit and sputter was from the condensate mixing with my gas.

WHY?
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Jon
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Joined: 01 Jun 2006
Posts: 2415
Location: Bishop GA

1969 Volkswagen Type 3

PostPosted: Sun Nov 02, 2008 3:30 pm    Post subject: Reply with quote

The pre-heat tubes from the exhaust to the manifold must be clogged. If they don't have the warm air passing thru them, the manifold freezes up as you are seeing.
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serprice



Joined: 26 Nov 2007
Posts: 349
Location: Statham

1974 Volkswagen Beetle

PostPosted: Sun Nov 02, 2008 7:47 pm    Post subject: Reply with quote

That strikes me as odd. It's not that cold around here. I drove mine around for a year with the preheats clogged and didn't no it. I found it when I built the engine. I drove through the winter and never had an ice issue. I guess every engine is different. I just wouldn't think it would be a problem, especially today being in the 60's. BTW whats up with your h30/31. You want me to help you get running?
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Clyde



Joined: 03 Jun 2006
Posts: 855
Location: Athens


PostPosted: Sun Nov 02, 2008 10:31 pm    Post subject: Reply with quote

To clear the preheat tube- use an old clutch cable in a drill- with a thick leather glove on your hand to guide the cable thru as you spin it in reverse. Use PB blaster on it too. It'll take an hour or so, but it works.
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Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Mon Nov 03, 2008 4:38 am    Post subject: Reply with quote

Its not the temps that caused the intake icing.. Its the combination of humidity dew point and temperature that lead to this and it typically happens worse this time of year, especially in the evening time just after sunset when air density is highest.

What carb does the engine run???
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Jake Raby
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Mon Nov 03, 2008 8:36 am    Post subject: Reply with quote

34 pic on a singleport manifold.

I can drive during the warm and dry part of the day with no problem, just like you said about the cool damp conditions.
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Mountain Power House



Joined: 26 Jul 2006
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Location: Aircooled Heaven USA


PostPosted: Mon Nov 03, 2008 4:21 pm    Post subject: Reply with quote

Heat risers are clogged up on the intake....
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Mon Nov 03, 2008 7:05 pm    Post subject: Reply with quote

Yep

Heat risers are clogged solid. Soaking them in every chemical I could get my hands on right now.

I tried the clutch cable and the coat hanger but this thing is really clogged.
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Mountain Power House



Joined: 26 Jul 2006
Posts: 879
Location: Aircooled Heaven USA


PostPosted: Tue Nov 04, 2008 10:26 pm    Post subject: Reply with quote

Chemicals won't cut it. Thats carbon- the same element that makes up a diamond!

Remove the intake, drill holes in the intake and use a welding rod with a hook bent onto the end of it chucked into a drill to ream the crap out of the entire heat riser.

Then weld the holes back up, re-install and drive.

No solvent on the planet will cut that Carbon.
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Jake Raby
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Sun Nov 09, 2008 2:15 pm    Post subject: Reply with quote

OK here goes

Changed the intake, exhaust, carb, and distributor. Still have the same problem.

This morning about 3 miles away from home I had to pull over. It started spitting and backfiring again. Same thing about and hour later on my way back.

I think I may need an air filter with the pre-heated air tube.
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Mountain Power House



Joined: 26 Jul 2006
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PostPosted: Tue Nov 11, 2008 12:20 am    Post subject: Reply with quote

Sounds like this intake also has a clogged heat riser. If you cannot easily blow air from one side of the heat riser tube through to the other you WILL have this issue.
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Adams77



Joined: 07 Oct 2008
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Location: Statham, GA


PostPosted: Tue Nov 11, 2008 9:53 am    Post subject: Reply with quote

We made sure to blow through the intake, both are clear as well is the muffler.
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Mountain Power House



Joined: 26 Jul 2006
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PostPosted: Tue Nov 11, 2008 1:10 pm    Post subject: Reply with quote

No reason why this is occuring unless the engine is running rich and the added fuel is acting as a coolant inside the carburetor.
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Jake Raby
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Adams77



Joined: 07 Oct 2008
Posts: 142
Location: Statham, GA


PostPosted: Tue Nov 11, 2008 1:27 pm    Post subject: Reply with quote

Lets say I do have an intake leak at the cylinder head and the carb was "tuned" to overcome the leak....

That could explain why my plugs read normal, but why do I have decent performance until the freezing?

I will replace the copper gaskets this weekend anyway.
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