Chummy radiator capacity?

[John Gould]

Can anyone tell me the water capacity of a chummy radiator and also the approximate core dimensions.
Many thanks,
John.

[Ivor Hawkins]

I think you’ve stumped the technical team there John, If I still had mine and pop out and measure it for you!

[Ruairidh Dunford]

What year is your Chummy - at least three types of radiators were used over production?

[John Gould]

I don’t have a chummy Ruairidh, it’s for my lightweight Ruby special, the very good but non-Austin rad I have is on the small side and I’m wondering if I’ll get away with it.
Basically I’d like to know what was the size/capacity of the smallest rad Pa Austin deemed adequate - which I imagined might be a small chummy?
Thanks so much for taking an interest.
Cheers, John.

[Ruairidh Dunford]

6 pints at smallest, roughly.

[Howard Wright]

Hi John (and Ruairidh)

I think 6 pints includes the hoses and space in the engine block, ie the total amount of fluid you put in to reach the level just below the cap.

Cheers

Howard

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Hi John

A further thought.  If you are not worried about period authenticity you can always use an electric fan and pump?

Cheers

Howard

[John Gould]

Thanks Howard but 6 pints in the system look do-able. Fingers crossed.
Still needing some dimensions as I’ll be making a bespoke rad surround/bonnet assembly and I’d like to know another rad would fit.

[Howard Wright]

Hi John

Unless someone posts before me I’ll measure the core on my 29 radiator tomorrow and let you know.  Earlier cars did have smaller cores!

Cheers

Howard

[Ruairidh Dunford]

I am hoping Stuart Palmer may post later for you...

[Greig Smith]

My blown single seater special has a very small radiator so I added a stainless tank on the scuttle & fitted a 12V circulatory pump from a VW. I fitted it next to the RF engine mount using a simple strap which locates under the RF engine mount bolt. It takes the feed directly from the lower rad hose & then pumps that up into the scuttle tank which has an internal labyrinth to prevent a direct path hot stream from in to out. The water then returns to the block via the side water feed which I flipped over to accept the feed from the scuttle tank. I painted the pump black to make it more discreet.

In the top view of the se-up the curved pipe should be fitted to the water pump but I drain the motor after events & I actually moved this pipe up & out the way to take the pic of the pump. The side view of the engine shows the pipe on the pump. I have 3 toggle switches on the dashboard - ignition; pump & fans. It works exceptionally well & apart from the curved stainless scuttle tank, the whole set-up was relatively inexpensive. 

Here's the pump I used --> https://www.aliexpress.com/i/32900854361.html - about 45 Quid

Aye
Greig