Hot oil box / oil cooler

Discussion in 'Volkswagen' started by Pops, Mar 6, 2016.

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  1. Mar 6, 2016 #1

    Pops

    Pops

    Pops

    Well-Known Member

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    I have stated this before but maybe this might help someone with their VW engine.

    Doing the first part of phase I test hours, I was getting carb ice at the drop of a hat, even worse than a Cont A-65. The engine never really ran as smooth as it should being balanced to within one gram. At times it ran a little rough and then smooth out and a little rough again. Also the mixture was changing. The problem was the intake charge at times was condensing into droplets and collecting and running into the cylinder making it run lean then rich. A VW with the carb on the bottom of the engine and the long intakes where they are getting the air blast on top of the engine was just to much. The test flying started on the month of Nov. Lyc engine have the intakes run through the oil sump to stop the same problem so why can't I do the same thing.

    I have a full flow oil cooler and filter so I welded a hot oil box around the intake at the base of the carb. Ran the oil to the box then to the cooler and then to the oil filter and back to the engine. Made the box from 1/8"alum with about 5/16" gap form the inside of the box to the OD of the intake to make sure the oil has to be in contact of the intake as much as possible but still get the flow needed.
    The engine runs like a different engine. Smooth at all times with more power since I can set the mixture correctly. I still use my exhaust carb heat when landing but have not had any carb ice since using the hot oil box. I always give the engine time for the oil to warm up before taxi and take-off. Its also a two-for-one, it also acts as an oil cooler. I used a point and shoot temp gauge and the oil coming out of the box is 20 degs cooler than the inlet temp. Now if the OAT is below 70 degs I unhook one of the air inlet hoses to the other oil cooler to keep the oil temp up at between 180 to 190 degs.

    Dan
     

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  2. Mar 6, 2016 #2

    don january

    don january

    don january

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    wow pop's you sure have some of the best cure's;)
     
    MikePousson likes this.
  3. Mar 6, 2016 #3

    Dana

    Dana

    Dana

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    Many half VW guys wrap some soft aluminum tubing around the intake and plumb it between the engine and the oil cooler. That's on my list of things to do on my Mosler; I have the tubing and just need a reasonably warm day when I have the time to do it.

    Dana
     
    Pops, MikePousson and dcstrng like this.
  4. Jan 3, 2020 #4

    Marc W

    Marc W

    Marc W

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    Pops,
    There is a discussion going on at the Thatcher groups.io that replaced Yahoo about heating the intake on VW's. Is it OK with you if I copy and paste your original post and your photos there?
     

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