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Sun Nov 22, 2009 9:35 am

You need to look at most any bug stocl air filter after about '62 an u will see how it hooks to filter assy,they got larger and better in say'68 and later. Yours with stock filter may have been when it had a cable to move air flap inside filter assy shutting off air to outside and slowly opening as engine warmed up. The dinky aftermkt ones won't cut it, have to have a 'means' to get warm air into intake, either going to a stock setup of choice or your own design. I added the elbow to my '70 bus and fabbed an intake assy to work, a bug eng so i used some bug parts. What about thst and flaps assy-they are needed or eng won't ever get norm running temp.

Sun Nov 22, 2009 9:42 am

It is a Baja and the thst and most of the tin was removed when I bought it. I will have to rig up some way to get some warm air to the carb.

Sun Nov 22, 2009 10:10 am

As morymob indicated, get a stock aircleaner and rig up a stock-style warm air chimney. Here's mine. Year-round daily driver in Colorado.

PS: If "thst" is thermostat, you need that too.

Max

Sun Nov 22, 2009 10:48 am

You get about a 45F temp drop at 13-1 F/A ratio. So if the temp outside is above about 75F you wont have any freezing problems regardless of manifold heat at startup. as the motor gets warm the outside temp can be as low as 60F without freezing. But anything below that you will need manifold heat and as in Max's climate a heated intake setup.
But this only relates to single center mounted carbs. A dual carb setup will run fine at -10F as in my case without any modifications. :D `

Sun Nov 22, 2009 11:10 am

With the exhaust that I have a I do not have any heater boxes. Is there any other way that I can get some warm air to my carb??

Sun Nov 22, 2009 2:53 pm

Heater boxes have nothing to do with this.

The bottom end of the warm-air setup is a metal part that gets warm air from around the 1/2 head. Here's a low-angle shot of it:

Max

Sun Nov 22, 2009 3:19 pm

That piece is also gone from my motor. If I wrap the part of the intake that is icing up with insulation wrap will that help??

Sun Nov 22, 2009 3:22 pm

I imagine that would keep the cold in ... :lol:

Max

Sun Nov 22, 2009 3:25 pm

Come on, guys. I just did a quick search for "warm air pickup" and ...

http://www.thesamba.com/vw/classifieds/detail.php?id=597046

Max

Sun Nov 22, 2009 3:28 pm

OK, so it is the cold air going through the intake that is causing the icing, not the cold outside air?? Is the air in the fan housing warmed any from the heads? If so, I can run a hose from the fan housing to the bottom of my air filter.

Sun Nov 22, 2009 3:30 pm

Sorry, but no. The air inside the shroud just passed through the fan and has not yet cooled anything. So it's still cold.

Max

Sun Nov 22, 2009 3:34 pm

Also, the icing (as I understand it) is caused by a drop in pressure as the air flows through the carburator and into the manifold. If there is some moisture in that air, it turns into ... ice.

This is why you can get icing at ambient air temps well above 32ºF. See Jimmy's previous post.

Max

Sun Nov 22, 2009 11:52 pm

i never knew about the pickup tube til Max showed me in another thread. my intake heater tubes are clear but with the straight exhaust, the exhaust was not flowing through them enough to heat the intake. i fabbed my own version of preheat system. i took a exhaust coupling and notched it and welded it to the header. the carb/intake draws warm/hot air off the header and into the intake. on my latest project, i wanted a preheat system. max told me about the preheat tube. i thought i might have one in my piles of vw stuff but i didnt but i did find a fuel fillline metal elbow that i welded a tab to bolt to the sheet that sticks under the cylinders and head and draws the warm air that is pushed off of the cylinders by the cooling fan. sorry i dont have any pictures of the second system but here are some of the system i made for my baja.

Mon Nov 23, 2009 4:16 am

Matching aircleaner with the 'elbow' part would be the easiest way to go for winter use,it is attached to the head tin and may not need the bracket to exh stud if u get 2 screws holding it on. Easy to remove filter and hose for warm weather if u want,but thst/flaps should be in yr round so engine runs at even as possible temps.

Mon Nov 23, 2009 6:51 pm

I am going to try to make a adapter from a pvc T . I will install it below the air filter and run a hose to the T to a set up as shown in pafree post. This should pull warm air from the exhaust in under the air filter. I will have foam filter in the hose to filter the air.

Mon Nov 23, 2009 9:11 pm

Oh look. I found some more.

http://www.thesamba.com/vw/classifieds/detail.php?id=809092

http://www.thesamba.com/vw/classifieds/detail.php?id=818433

... and this one still has the thermal wrap!

http://www.thesamba.com/vw/classifieds/detail.php?id=489345

"this pipe bring the warm air into the air cleaner so the carburetor wont ice up"

:lol:

Max

Mon Nov 23, 2009 11:09 pm

using the PVC t kinda scares me. since you are using a aftermarket filter and this system is designed for the oilbath or orginal style filter, what if you made/bought a box or can to cover the airfilter and pipe the warm air in. the screw that holds the top on airfilter could hold the box on. here is a rough draft drawing. it might work with the bottom of the can open but you could cut a opening for the base of the filter to stick through and have the lid screw closed. it will also keep the rain from getting your paper filter wet.

or this with a closed bottom and removal top.

Tue Nov 24, 2009 5:19 am

I might have a old aluminum cake pan in the garage that will fit over the air filter. I could cut a hole in the side of it and epoxy a piece of tail pipe to it to hook the hose up too.

Tue Nov 24, 2009 3:08 pm

After the suggestions on here this is what I came up with. The air filter cover is made from a 8 inch aluminum cake pan.

http://img.photobucket.com/albums/v486/larry408/airduct1.jpg

http://img.photobucket.com/albums/v486/larry408/airduct2.jpg

Tue Nov 24, 2009 6:18 pm

Hey now. That's looks pretty nifty! How well does it work?

Max