The following warnings occurred:
Warning [2] Undefined variable $search_thread - Line: 60 - File: showthread.php(1617) : eval()'d code PHP 8.1.31 (Linux)
File Line Function
/inc/class_error.php 153 errorHandler->error
/showthread.php(1617) : eval()'d code 60 errorHandler->error_callback
/showthread.php 1617 eval



Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
Starting hesitancy 1930 Chummy

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Threaded Mode
Starting hesitancy 1930 Chummy
Howard Wright Offline
Grey Mag editor
*****
Joined: May 2018 Posts: 2,110 Threads: 110
Reputation: 22
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
Reply
David Stepney Offline
Cantankerous Welsh Hermit
*****
Joined: Jan 2019 Posts: 1,567 Threads: 20
Reputation: 14
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!
Reply
PeterN Offline
Member
***
Joined: Feb 2023 Posts: 58 Threads: 18
Reputation: 0
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)
           
Reply
Tiger Offline
Senior Member
****
Joined: Apr 2018 Posts: 507 Threads: 129
Reputation: 2
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 ?
Reply
Ruairidh Dunford Offline
Bearded Wizard
*******
Joined: Mar 2015 Posts: 5,443 Threads: 231
Reputation: 67
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/
Reply
Ruairidh Dunford Offline
Bearded Wizard
*******
Joined: Mar 2015 Posts: 5,443 Threads: 231
Reputation: 67
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/
Reply
Ruairidh Dunford Offline
Bearded Wizard
*******
Joined: Mar 2015 Posts: 5,443 Threads: 231
Reputation: 67
Location: Scotchland
#27
09-03-2024, 12:30 PM
You require a bowl like this…

       
https://gordonenglandregister.wordpress.com/
Reply
PeterN Offline
Member
***
Joined: Feb 2023 Posts: 58 Threads: 18
Reputation: 0
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.
Reply
Colin Morgan Offline
Member
*****
Joined: Aug 2017 Posts: 1,049 Threads: 108
Reputation: 3
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?!
Reply
Andy Bennett Offline
Blacksmithing beekeeper
*****
Joined: Aug 2017 Posts: 773 Threads: 33
Reputation: 16
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!
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)