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HQ_SS_Andy Offline
#1 Posted : Tuesday, 13 July 2021 7:29:59 PM(UTC)
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Hi All.
The right hand side exhaust manifold (on 253 and 308 engines) have a heat tube pressed through the middle of it.
This tube connects up to the thermal choke on the carburetor, opening the choke as the engine/manifold warms up.
This tube is supposed to have a spiralled metal strip running through it.
I have a few questions on this topic:

1. What does this spiralled strip do ? My thoughts are that it might slow down the air passing through the tube. It also provides a longer path for the air to travel through the tube. This would allow more heat to transfer from the manifold to the air flow.

2. Is this spiral strip a press fit inside the tube ? Or does it float around in there ?

3. If this spiralled strip is not present, is the choke operation greatly impacted ?

3. Are the connecting pipes coming down from the carburretor a press fit into the manifold ? Should a sealant be used when connecting these pipes ?

Your expert advice on this critical matter would be appreciatedBigGrin BigGrin .
Rgds,
Andrew.
HK1837 Offline
#2 Posted : Tuesday, 13 July 2021 9:12:34 PM(UTC)
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I just put all this back together on my HJ 5.0L. The pipes look to have a small taper on them and press into the exhaust manifold. One of my pair of pipes cracked as it had been bent to connect to a Holley, so I bought a stainless replica pair.
I never noticed a spiral strip, but I also never looked. I have a dozen or so manifolds in the shed, will look in their tubes.
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HQ_SS_Andy Offline
#3 Posted : Tuesday, 13 July 2021 9:31:35 PM(UTC)
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Thanks HK1837.
I've seen the repro connecting tubes you can get. They do look good to me and I plan to grab a set when I'm ready.
Here's an image I stole off the net showing the spiral strip:


Rgds.
Sandaro Offline
#4 Posted : Tuesday, 13 July 2021 9:48:50 PM(UTC)
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I've not seen one like that before, what model is that from? The ones I've seen (hq and hj) have the single pipe wrapped in some sort of insulating material
HQ_SS_Andy Offline
#5 Posted : Tuesday, 13 July 2021 10:09:41 PM(UTC)
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It's at least from an HQ (253&308). Image is stolen off the net, but I have exactly the same image in my HQ parts catalog. One of the connecting pipes does have an insulating wrap on it, but what I'm interested in is the spiral strip inside the manifold itself.
My catalog calls it 'Baffle - Choke heat tube'. Part number is 2805461.
Rgds.
Sandaro Offline
#6 Posted : Wednesday, 14 July 2021 6:12:24 AM(UTC)
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Yeah, I've googled and saw examples of your set up. Mine only have the insulated pipe (not the return one), I wonder if this is a different setup or if the other part has been removed from my ones?

I would think you thoughts that the spiral is to slow (or retain) heat would make sense.
HK1837 Offline
#7 Posted : Wednesday, 14 July 2021 6:58:51 AM(UTC)
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All HT-HJ and LH to 5/76 LX V8 (except 350 and L34) have two pipes. One is heated, the other is the supply air, comes from a barb in the base of the air cleaner.
I’ve always thought those spirals indicated air flow! Never realised they were actually there.
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supercoach24 Offline
#8 Posted : Friday, 16 July 2021 9:29:05 PM(UTC)
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this is interesting, I thought it was just a diagram and not really meaning it was spiral. I had to replace mine in my HT 253 and the rusted pipe we took out was just straight, but looked to have some sort of sleeve inside the slow the air? this was not present on the factory diagram.

Any I fitted a straight tube and it has been working ever since. Never knew it had to be spiral as there was never no mention.
HQ_SS_Andy Offline
#9 Posted : Saturday, 17 July 2021 10:30:12 AM(UTC)
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Originally Posted by: supercoach24 Go to Quoted Post
this is interesting, I thought it was just a diagram and not really meaning it was spiral. I had to replace mine in my HT 253 and the rusted pipe we took out was just straight, but looked to have some sort of sleeve inside the slow the air? this was not present on the factory diagram.

Any I fitted a straight tube and it has been working ever since. Never knew it had to be spiral as there was never no mention.


I'm pretty sure the tube inside the manifold is just a straight tube. Inside this straight tube should be a spiraled strip from what I can tell. I am interested to know if this strip just floated around inside the tube, or if it should be a tight fit. If it was just floating around in the tube, I guess it would be very easy to lose as the manifolds get worked on over the years.

Rgds.
supercoach24 Offline
#10 Posted : Saturday, 17 July 2021 2:12:31 PM(UTC)
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Originally Posted by: HQ_SS_Andy Go to Quoted Post
Originally Posted by: supercoach24 Go to Quoted Post
this is interesting, I thought it was just a diagram and not really meaning it was spiral. I had to replace mine in my HT 253 and the rusted pipe we took out was just straight, but looked to have some sort of sleeve inside the slow the air? this was not present on the factory diagram.

Any I fitted a straight tube and it has been working ever since. Never knew it had to be spiral as there was never no mention.


I'm pretty sure the tube inside the manifold is just a straight tube. Inside this straight tube should be a spiraled strip from what I can tell. I am interested to know if this strip just floated around inside the tube, or if it should be a tight fit. If it was just floating around in the tube, I guess it would be very easy to lose as the manifolds get worked on over the years.

Rgds.


this is interesting if its true, i just put a straight stainless pipeline, same diameter. If there is meant to be something spiral then it means I have don e mine wrong. but as said no mention or reference to something spiral needing to be in there.
Dr Terry Offline
#11 Posted : Saturday, 17 July 2021 4:22:04 PM(UTC)
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I've seen a lot of those spiral things fall out over the years. They just 'push' in, with not much holding them in except for a bit of friction & the two tubes which simply slide in each end.

The idea of the spiral is just to expose the air to more hot metal surface area for quicker warm up of the the air itself.

Dr Terry
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supercoach24 Offline
#12 Posted : Saturday, 17 July 2021 11:58:45 PM(UTC)
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Originally Posted by: Dr Terry Go to Quoted Post

I've seen a lot of those spiral things fall out over the years. They just 'push' in, with not much holding them in except for a bit of friction & the two tubes which simply slide in each end.

The idea of the spiral is just to expose the air to more hot metal surface area for quicker warm up of the the air itself.

Dr Terry


do you have a photo of one should look like or one in general? the diagram doesn't really help visualize nor where to think where to buy one.

Edited by user Saturday, 17 July 2021 11:59:53 PM(UTC)  | Reason: Not specified

HK1837 Offline
#13 Posted : Sunday, 18 July 2021 8:31:36 AM(UTC)
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I don’t reckon you need it unless you like in a really cold climate. After I put my Premier back together, from dead cold the heat tone into the carb was warm within seconds and the choke started to open after maybe 2 minutes.
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If we all had the same (good) taste, who would buy all the Fords?
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