12 Hours…

Okay, does anyone else have this problem?  Every time I disassemble the TC to do a repair / modification I always finish the re-assembly 12 hours or less before the next MG event.  All of my work turns out to be a “Pit Stop” with the clock ticking down.  Not to mention the one or two day air shipment of parts.  This time it was to combat the hot weather vapor lock problem.  I installed a heat shield, TF intake spacers, and tweaked the carburetor adjustments.  The actual list of what I did would take much longer and include NSFW vocabulary. 🙂  Fortunately, the end result is almost invisible.  Can you spot the stainless steel heat shield in the photo below?


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5 Responses to 12 Hours…

  1. jyouens says:

    Dan, the stainless heat shield came from Barrie Jones in the UK. He can be reached at: barrietf@btinternet.com . From his email, Barrie states that:

    The heat shield comes as a kit complete with two spacers.
    It costs £27.
    Airmail to the USA costs £10.15
    Please read attached leaflet.
    I can accept PayPal.
    Barrie Jones

    I used 5mm TF style spacers designed for 1 1/4″ TC intakes from Doug Pelton. I also bought 8mm x 1.0mm pitch x 32mm long studs (actually I had to buy longer ones and cut them down to length.)

    The normal TC carb bolts (8mm x 1.0mm pitch) will not fit when the spacers and heat shield are added. Too much additional length to fit past the float bowls. The studs also greatly help in aligning the additional carb gaskets between the manifold, spacers, heat shield, and carburetors. You will need six gaskets for this instead of the normal two gaskets.

    Here is the big “gotcha”; I had to significantly modify the stainless heat shield in order to fit it over the manifold (intake and exhaust) clamps. Using the 12mm aluminum spacers that Barrie provided, the heat shield would fit with no problem. However, on my car this left less than 4mm between the air intake manifold and the bonnet. I didn’t feel comfortable with this, so I modified the heat shield to fit closer to the engine while using the 5mm spacers from Doug Pelton. I can send you the photo of the mods, or I can create another post.

    Nothing is ever simple, is it? 🙂 However, after a 70 mile run, the float bowls were still only warm on the back side near the exhaust manifold. I will let you know if I experience vapor lock in the future.

  2. Dan Asbury says:

    As usual the modifications/repair work you perform on your TC are top notch.Did you design and fabricate the shield? If so would you consider making another?

  3. Rob says:

    Hi John – I wouldn’t have noticed it if you hadn’t mentioned it. It looks very well done! Why’d you pick stainless? I’d have guessed something like phenolic would work better as a heat shield.

    • jyouens says:

      Rob, I was told by an engineer friend of mine that stainless steel conducts less heat than any other metal. I also bought a heat shield from Brown & Gammon that is made of a gasket material sandwiched between two pieces of steel. However, it doesn’t have the coverage area that this one does. After the drive today, I could put my hand on the carburetors and they were relatively cool. Time will tell if this solves the problem.

  4. jyouens says:

    Oh, I forgot to mention that I had the exhaust manifold Jet-Hot coated inside and out for heat reduction. Time will tell if all this works.

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