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Pre heater tubes on classic vw beetle intake off of carb
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mattlutz
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PostPosted: Tue Feb 28, 2012 12:23 pm    Post subject: Pre heater tubes on classic vw beetle intake off of carb Reply with quote

can the pre heater tubes be cut off and welded shut on the 1600 motors that come off the long flange from the carb on a dual port and goes to the exhaust then without negatively affecting the motor.?
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anthracitedub
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PostPosted: Tue Feb 28, 2012 12:39 pm    Post subject: Reply with quote

You should do a search on preheat tubes and read up on this topic... I think you'll find that keeping them will be beneficial.
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Nevada Notch
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PostPosted: Tue Feb 28, 2012 1:47 pm    Post subject: Reply with quote

This section of the intake manifold serves 2 functions.

1.) It channels hot air through the bottom of the center section of the intake runner and it keeps the intake from icing over in the cold weather. When the runner ices over it will cause acceleration stumbling when transitioning from idle. The accelerator pump does not atomize fuel, it squirts it like a squirt gun. These droplets of fuel do not atomize until they hit the bottom of the hot intake runner.

2.) It also serves as a support for the center section of the intake runner. If you were to cut these off, you will have to brace the center section of the manifold due to the pull of the throttle cable.
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KTPhil Premium Member
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PostPosted: Tue Feb 28, 2012 5:15 pm    Post subject: Reply with quote

Are you running an aftermarket muffler/header that lacks the proper connections for the heat riser?
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61SNRF
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PostPosted: Tue Feb 28, 2012 6:14 pm    Post subject: Reply with quote

Do you mean this pipe (lower red arrow)?...
Image may have been reduced in size. Click image to view fullscreen.
Photo from the Gallery thanks to shakers73
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mattlutz
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PostPosted: Tue Feb 28, 2012 6:20 pm    Post subject: Reply with quote

61SNRF wrote:
Do you mean this pipe (lower red arrow)?...
Image may have been reduced in size. Click image to view fullscreen.
Photo from the Gallery thanks to shakers73
no its the one that comes from the intake tubes off carb but goes to exhaust the small dia tube on left and right..the one in your pic behind the aluminum heater hose
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mattlutz
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PostPosted: Tue Feb 28, 2012 6:22 pm    Post subject: Pre heater tubes on classic vw beetle intake off of carb Reply with quote

not where the red arrows are ..the small dia tubes that bolt on to the exhaust it comes off of the larger tubes from the intake of the carb on left and right side..
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mattlutz
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PostPosted: Tue Feb 28, 2012 6:24 pm    Post subject: Pre heater tubes on classic vw beetle intake off of carb Reply with quote

in your pic its the silver rusted pipe to the left of the distributor
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61SNRF
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PostPosted: Tue Feb 28, 2012 6:43 pm    Post subject: Reply with quote

In that case Nevada Notch has answered your question as well as I or most can, and all the other comments relevant to pre-heat tube apply as well.
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zzhayward
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PostPosted: Tue Feb 28, 2012 11:30 pm    Post subject: Reply with quote

In warm climes ( HI, SoCA, Mex) you can get away without carb heat. Cold morning or non warm climes you must have. Something about entropy and change of state from liquid to gas ((see physics of a refrigerator)) Ditto on the carb support need
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KTPhil Premium Member
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PostPosted: Wed Feb 29, 2012 8:52 am    Post subject: Reply with quote

Why do you want to do this?

Back to my question about what muffler/header you are running...
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