Heat Riser Sleeve

J Lombard
J Lombard Member
edited November -1 in HUDSON
Hello all:

On ebay there was an item (no.320049831729) that was described as "1927 1928 Hudson Heat Riser sleeve". It appeared to be about 8 or 9 inches long & about 2 inches in dia. narrowing down to 11/2 inches in dia. I went out to look at my '27 Hudson & couldn't find such an item. Does anyone know what this might have been? Was it an option type thing?



regards



J Lombard

Comments

  • Geoff
    Geoff Senior Contributor
    The tube goes inside the hot box, between the carburettor and the inlet elbow. these burn out and the engine dies.

    Geoff.
  • J Lombard
    J Lombard Member
    Geoff:



    Thanks a lot. No wonder I couldn't see it.



    regards



    J
  • Jon B
    Jon B Administrator
    Maybe Geoff will correct me here (because I'm in unfamiliar territory) but I believe that some people replace the heat riser tubes with modern stainless steel tubing, in the late '20's Hudsons. At least in 1929's. Of course, this Ebay tube may be more 'authentic', but it seems to me that stainless steel would be a much more durable material than a simple steel replacement tube. And, as you say, you can't see it, so who would know?
  • Geoff
    Geoff Senior Contributor
    The original sleeves were of mild steel tubing, and usually burnt out after about 50 or 60 years. I daresay the stainless ones would last a lot longer, but I wouldn't say what the chances were of being around to get your money back on a steel one when it fails.

    Geoff.
  • Unknown
    Unknown
    Geoff C., N.Z. wrote:
    The tube goes inside the hot box, between the carburettor and the inlet elbow. these burn out and the engine dies.

    Geoff.



    Ok, now I'm curious too.



    I have a '48. The "heat riser" on my car is used to drive the auto choke, and goes between the exhaust manifold and the choke on the carb. It's a tube with some sort of fiber covering. Probably asbestos, and if I havn't already I'll probably check it and replace it.



    Did older cars (20s ish) need to heat the carburetor for some reason? Or does this thing (non choke related heat riser) exist on my car as well?



    What is a "hot box"?



    -Chris
  • Geoff
    Geoff Senior Contributor
    The "hot box" is a term used for the chamber that surrounds the intake passage between the carburettor and the manifold, and later models also have a similar arrangements, which is part of the manifold casting. In the earlier models lke we are talking about ('27-'29) with Marvel carburettors, there was a steel tube which went through the casting, and part of the exhaust gases were channeled around this area, the idea being to aid the vaporisation of the incoming charge. This was necessary because of the very heavy grade gasoline used in those days. The little metal shield you are referring to on your car is the intake for the auto choke heat-sensitive spring, which loses tension as it heats up and allows the choke to open. This does not of course suck exhaust gas, just the hot air from around the manifold.

    Geoff.
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