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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Sun Nov 02, 2008 12:51 pm Post subject: Frozen intake |
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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 Site Admin
Joined: 01 Jun 2006 Posts: 2421 Location: Bishop GA
1969 Volkswagen Type 3
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Posted: Sun Nov 02, 2008 3:30 pm Post subject: |
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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. _________________ 73 Typ481
76 Westy
73 Bug
69 Squareback
70 Fastback
63 Bug |
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serprice
Joined: 26 Nov 2007 Posts: 349 Location: Statham
1974 Volkswagen Beetle
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Posted: Sun Nov 02, 2008 7:47 pm Post subject: |
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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? _________________ Shane Price
74 standard beetle |
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Clyde
Joined: 03 Jun 2006 Posts: 855 Location: Athens
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Posted: Sun Nov 02, 2008 10:31 pm Post subject: |
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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. _________________ '69 Bug, 1776, dual kadrons, Web 111 cam
Clyde's Aircooled
(706) 206 6327 |
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Mountain Power House
Joined: 26 Jul 2006 Posts: 879 Location: Aircooled Heaven USA
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Posted: Mon Nov 03, 2008 4:38 am Post subject: |
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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??? _________________ Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4 |
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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Mon Nov 03, 2008 8:36 am Post subject: |
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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 Posts: 879 Location: Aircooled Heaven USA
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Posted: Mon Nov 03, 2008 4:21 pm Post subject: |
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Heat risers are clogged up on the intake.... _________________ Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4 |
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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Mon Nov 03, 2008 7:05 pm Post subject: |
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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
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Posted: Tue Nov 04, 2008 10:26 pm Post subject: |
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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. _________________ Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4 |
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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Sun Nov 09, 2008 2:15 pm Post subject: |
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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 Posts: 879 Location: Aircooled Heaven USA
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Posted: Tue Nov 11, 2008 12:20 am Post subject: |
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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. _________________ Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4 |
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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Tue Nov 11, 2008 9:53 am Post subject: |
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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 Posts: 879 Location: Aircooled Heaven USA
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Posted: Tue Nov 11, 2008 1:10 pm Post subject: |
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No reason why this is occuring unless the engine is running rich and the added fuel is acting as a coolant inside the carburetor. _________________ Jake Raby
57 Oval
64 Porsche 356C Outlaw
66 Bug -The Plague Returns!
73 VW Thing (Will I ever finish it?)
73 Superbeetle (Suby Power!)
76 Porsche 912E (X3!)
79 VW Iltis 4X4 |
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Adams77
Joined: 07 Oct 2008 Posts: 142 Location: Statham, GA
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Posted: Tue Nov 11, 2008 1:27 pm Post subject: |
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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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