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Radiator dimension
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09-01-2020, 03:40 PM
In terms of height, could someone please tell which is the smallest standard A7 radiator? I am considering altering the rad position on the Special and the one on there at the moment (which I think is probably off a Box) is too tall for where I want it to fit.
From an earlier forum post:
According to Bill Williams there are 3 sizes of radiator cores fitted to the A7: 14.5" 1923 - 1926 (mag engine), 16" 1928 - 1931 (early coil) and 17.75" 1931-1934 (box) So the early Chummy type is the smallest. (Note these are core sizes only, excluding top and bottom tanks).
09-01-2020, 08:05 PM
I had exactly the same problem with my special just before Christmas when I decided to alter the front bodywork
and lower it by 3". In the end, the cheapest option for me was to pick up an old rad. with a knackered core and have it recored with a shorter core and sell the good rad. that was in the car. Coincidentally, I had the new core shortened to 14 1/2" instead of 17 1/2". New 3 veined core plus new studs soldered into the bottom tank and resprayed for £200.( + £10 for the old rad)
10-01-2020, 01:02 PM
(This post was last modified: 10-01-2020, 01:04 PM by Nick Salmon.)
Here comes a naive question...
Will any simple radiator with a top and bottom outlet/inlet work on the thermo-syphon principle? Purely hypothetically, if I put say a BMC Mini rad into the Special, would it function? 
10-01-2020, 05:51 PM
The header tank needs to be above the engine to allow the hot water to rise into it. If the radiator is lower a pump is needed.
Jim
10-01-2020, 06:50 PM
Hi Nick
If, as Jim says, the header is above the engine then I think any rad will work. How well it works depends on lots of factors. On my previous special the radiator specialist put a Vauxhall Cavalier core between the original tanks and that seemed to work well. I’ve just had a new core put in the header and bottom tanks of the current special. Not sure what that was intended for but we’ll find out once the engine is built. I guess it’s a question of suck it and see? Cheers Howard 
10-01-2020, 08:16 PM
(This post was last modified: 11-01-2020, 01:04 PM by Steve Jones.)
As long as the header tank is above the engine then the thermo-syphon will work. It's basic physics. However, there's no need to wander around looking for a modern radiator with dimensions that will achieve this. Modern radiator cores are supplied in large units and your radiator man will simply arrange to have a suitably sized section cut from this to a size that fits your needs. That's also the cheaper option compared with modifying an existing modern radiator to fit.
Steve
11-01-2020, 10:56 AM
That's exactly what I did.
The old rad I picked up was from a Ruby so all the fixings and pipe connections were in the right place. I'm sorry I didn't make it clear in my earlier post that it was an Austin 7 old rad that I'd used. The local company I used will also post you the radiator when it's done. |
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