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Starting hesitancy 1930 Chummy

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Starting hesitancy 1930 Chummy
Howard Wright Offline
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Joined: May 2018 Posts: 2,098 Threads: 110
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Location: Llandrindod Wells
Car type: 29 Special, 30 RK, 28 C Cab
#21
09-03-2024, 09:15 AM
(09-03-2024, 08:20 AM)Colin Cooke Wrote: How would you flood a 26VA carb, with no fuel pump? I can only think of loosening the float bowl.

Is it a bad choice of carb, to use without a mechanical pump? I know Howard says that it will work; but is it ideal?

Hi Colin,

Agreed, I only know it will work as this is the set up that came with my van (subsequently changed). 

Maybe Peter has an electric fuel pump fitted?

Cheers

Howard
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David Stepney Offline
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Joined: Jan 2019 Posts: 1,564 Threads: 20
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Location: Bala North Wales
Car type: 1933 RP Standard Saloon
#22
09-03-2024, 09:58 AM
I have found with my own car an RP with a26VA carb, that it is imperative that the choke closes fully for reliable starting. My own cold star technique is to prime the carb with the pump priming lever, set the ignition to half advance, full choke and pull the starter knob. Starts instantly first time!
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PeterN Offline
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Joined: Feb 2023 Posts: 55 Threads: 17
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Location: Bedfordshire
Car type: Austin Chummy 1930
#23
09-03-2024, 11:38 AM
Here are the pictures asked for by Ruairidh. Additionally I have 2 spare bowls which I now see are different. Is the correct one fitted? Item 22 seems to be fitted correctly. I’m now leaning toward ineffective choke.


Attached Files Thumbnail(s)
           
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Tiger Offline
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Location: Staffordshire
Car type: Ruby mk 2
#24
09-03-2024, 11:56 AM
Is there any evidence that fitting a suitable say 1” SU carburettor helps cold start ?
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Ruairidh Dunford Offline
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Location: Scotchland
#25
09-03-2024, 12:24 PM
You have the incorrect (later bowl fitted).

I will find a photo of the correct bowl that you need and post it up.
https://gordonenglandregister.wordpress.com/
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Ruairidh Dunford Offline
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Location: Scotchland
#26
09-03-2024, 12:27 PM
Also:

- in the top photo, your choke is not fully closed.

- you appear to have a later crankcase in the car, this will allow you to fit a mechanical fuel pump, which I recommend you do.
https://gordonenglandregister.wordpress.com/
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Ruairidh Dunford Offline
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Location: Scotchland
#27
09-03-2024, 12:30 PM
You require a bowl like this…

       
https://gordonenglandregister.wordpress.com/
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PeterN Offline
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Joined: Feb 2023 Posts: 55 Threads: 17
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Location: Bedfordshire
Car type: Austin Chummy 1930
#28
10-03-2024, 03:22 PM
Ruairidh is spot on, the choke is not opening fully due to the strangler lever fouling the cowl distance piece. Said lever is moving laterally. Strip and find out how to contain it in the correct plane to fit into the groove rather than against the body. I do like it when a reason for a problem is properly identified.
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Colin Morgan Offline
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Joined: Aug 2017 Posts: 1,046 Threads: 108
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Location: Cheshire
#29
10-03-2024, 04:11 PM (This post was last modified: 10-03-2024, 05:28 PM by Colin Morgan.)
Hi Ruairidh - Please could you explain the different bowls - two stripes, one long/one short and no stripes across the bottom? When are they right and/or wrong?!
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Andy Bennett Offline
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Joined: Aug 2017 Posts: 767 Threads: 33
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Location: Beautiful Northumberland
Car type: 1933 RP Saloon (aka Mildred)
#30
10-03-2024, 04:15 PM (This post was last modified: 10-03-2024, 04:30 PM by Andy Bennett.)
Peter: do also take note of Ruairidh's note regarding bowl type. I did and it massively improved running to have the right bowl with the right top.
Andy
This was an earlier thread with more info from R regarding bowl types, basically 2 lugs on top goes with 2 lugs on the bowl, one lug goes with a domed bowl:

https://www.austinsevenfriends.co.uk/for...4#pid27324

Although mechanically interchangeable and not obvious unless the carb is off the difference in performance for me was significant.
Enjoy yourself, it's later than you think!
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