Cleaning heat risers

//Cleaning heat risers
Cleaning heat risers2018-01-05T22:57:00+00:00

Home Forums Technical Questions Cleaning heat risers

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  • Volksman
    Participant
    Post count: 60

    What do you guys do to clean plugged heat risers? I’m messing with the intake on my stock 63 and both sides are plugged. I’ve read a lot of different suggestions most of which focus on three things: drilling, boring with an old clutch cable, or torch. As far as I know there aren’t any chemicals that have any impact on the carbon correct? I’m planning to find a cable tomorrow and try that but figured it would be worth asking for the insight of the experts. I don’t want to do the torch method and would love to avoid drilling  unless that’s really my only choice.

    Vwfool
    Participant
    Post count: 184

    When I worked at a VW machine shop the way we did it was drill a hole in the bend just above the exhaust flange mount and another hole on the backside of the heat riser tube where it joins the intake manifold. If it was solid plugged I would find the longest drill bit I could and use that to break up the really heavy build up. Then go thru it with a clutch cable and lastly blow it out with the air nozzle. Then wrld up the 4 holes and you’re done. I did 100’s of them.

    John Jones
    Keymaster
    Post count: 3677

    Sounds like a solid recommendation…  From Shrek….

    I have tried the clutch cable thing.. works ok., direction sensitive sometimes, and can get bound up in there.. I think the best is the hammered flat end of a solid throttle cable to make a spade….  You can make a bunch out of one old cable.. Old heater cable would work also.  Hood pull cable etc… Make a short one, a couple inch’s… put it in a drill and start your directional boring.. 😉   I usually cleans it up with much hassle…  although I had one just the other day I couldn’t clear on Zack’s project.  But lucky for me.. I have a trailer full of old one’s…  just grabbed another one.

    Jdawg
    Participant
    Post count: 416

    What are the common symptoms of a clogged heat riser?

    Pete
    Participant
    Post count: 554

    What are the common symptoms of a clogged heat riser?

    Carb icing and vapor lock I believe.

    Volksman
    Participant
    Post count: 60

    I got the heat risers cleared out but they still aren’t working correctly. The intake below the carb is getting iced over and of course it doesn’t run right after that happens. So I’m wondering if the muffler I bought isn’t working correctly.

    I don’t recall where I bought it or the brand. I’ve seen a few places selling Dansk brand.

    What brand do you guys recommend?

    • This reply was modified 10 months, 2 weeks ago by  Volksman.
    Franz
    Keymaster
    Post count: 1723

    Stock mufflers are all pretty much the same. You shouldn’t be icing up like that. You can check to verify that the left heat riser tubes is plumbed into the exhaust tip so that its sucking air through the heat riser.

     

    Franz
    Keymaster
    Post count: 1723

    Too much fuel or choke would cause it cold too.

    Volksman
    Participant
    Post count: 60

    Thanks Franz. I’ll check the line to make sure it’s open. Does it pull from left to right then?

    The carb was just rebuilt and I haven’t really adjusted it so maybe that could be it too. I’ll check it out.

    I really appreciate all the help you guys constantly give me by answering my dumb questions.

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