methylman
My car started hesitating in 3rd and 4th gears, just when it's starting to get really cold here in the Northeast.  Sounds like my heat riser tubes are clogged (they look old and rusted).  Does anyone have any ideas about where to find new ones (I looked but couldn't find)?  Does this problem ground many Super Beetles during the cold winters?

Thanks!

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Jerky_san

Well I've seen them rusted and still working but you can get a whole new intake piece from http://www.aircooled.net http://www.cbperformance.com http://www.800luvbugg.com any of these places have the whole intake piece.. They cost around 60 dollars.. also if you wanted to go used http://www.thesamba.com But I found the newer ones don't work to well.. The 74 model heater riser I think is one of the best since they are so huge that it takes it a while to get clogged.. Also when you start the car and let it run from being cold if you can see ice appearing all down from the base of the carb to where the heat risers are then they are clogged. Or if you drive for a couple of miles to where the engine should be warm and the intake has a coat of thin ice then yeah they are clogged.. The only other way to fix your problem is to richen your mixture but yeah I wouldn't go that route.. The mechnic that made my carb go that route opened up my jets a little bit more and I've never been able to get the carb right since..

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methylman
Thanks.  Do you know if they can be unclogged using some kind of auger tool?  I don't think that carbon buildup could be dissolved by any chemical.
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Jerky_san

I know you can use one of those brushes that you clean a gun barrel out with sorta.. Also a clothes hanger to get the initial knock through.. Be careful though cause you can shove a hole right through the top of an end since they tend to be fairly thinned out..

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NoH2O
If it's clear enough to get a broken accelerator cable or something equivalent up through it past the main intake barrel, try attaching the other end into a drill. Kind of acts as a very flexible auger. The braided line can knock a lot of it out of there. I read that somewhere, can't quite place it. We tried it on a bunch of used intakes that we were reselling and it actually worked well on some of them. Others were just too far gone. Make sure to blow out ALL the debris with a high pressure air hose. when finished. If it seems fairly gone, your best bet will be to replace it while you've already got it apart.

Steve
'63 Ragtop
'56 Ragtop
'78 Riviera camper


"..at least I'm enjoyin' the ride"
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methylman
I'm in the process of winterizing the car I bought this summer. It hasn't been driven in winters according to the last owner. Now I know why (if my hunch about the heat risers causing the hesitant acceleration in higher gears is correct).

Since I'm installing a new muffler and heat exchangers, I'll have the mechanic auger the heat riser tubes from that end if they're clogged. I'll first test their temperature after driving it a few miles (without burning my hand in the process hopefully).

Cheers.
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68autobug

Last time I had My engine out, I happened to notice some rust on the back side of the high risers, which were painted yellow at the time..

I chipped away at the rust until I had a long hole on both sides...
so I poked etc until there was no more rust coming out...
My Son then welded the holes up and I then painted the high risers with POR 15 silver hi temp paint...

I think its better to replace them if possible...
and paint inside the pipes with high temperature paint..
just spray or pour in until it comes out the bottom,
then turn it upside down....

cheers

Lee

http://community.webshots.com/user/vw68autobug

68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

http://community.webshots.com/user/vw68autobug
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Sleepwalker
Something I found to be a lot of help if your tubes are blocked real bad.
From Jim Tyler's "Enthusiast's Restoration Manual, How to restore Volkswagen Beetle" (See Attatched Image) Is how to "Burn" it out. Just be carfull not to warp the flange.
"He who knows enough to learn, knows enough"
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68autobug
 
thats someting I would not have thought of...
 
very interesting....
 
Lee
68AutoBug - helping keep air cooled Volkswagens alive in Australia & around the World -

http://community.webshots.com/user/vw68autobug
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