Classic cars forum & vehicle restoration.
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22442 Location: UK
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47p2
Joined: 24 Nov 2007 Posts: 2009 Location: Glasgow
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Posted: Sun Jul 29, 2012 5:33 pm Post subject: |
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Does the vehicle have a compressor and air tanks? _________________ ROVER
One of Britain's Fine Cars |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22442 Location: UK
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47Jag
Joined: 26 Jun 2008 Posts: 1480 Location: Bothwell, Scotland
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victor 101
Joined: 03 Apr 2009 Posts: 446 Location: East Yorkshire
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Posted: Sun Jul 29, 2012 8:18 pm Post subject: |
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Can you see the back of it at all to see if there are any pipes or cable runs? |
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PAUL BEAUMONT
Joined: 27 Nov 2007 Posts: 1281 Location: Barnsley S. Yorks
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Posted: Mon Jul 30, 2012 1:35 pm Post subject: |
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As a really wild guess it looks like a control for an exhaust brake, but I thought that these were only fitted to diesels. |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22442 Location: UK
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Posted: Wed Aug 15, 2012 8:35 am Post subject: |
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Posted as a reply on the AACA forum, the mystery gadget has been identified:
"This an extra air valve - a popular 1920s accessory. The valve introduces extra air into the intake manifold to lean out the mixture and improve economy when running easy. As the effect reduced engine braking, the valve had a "brake" position which closed it. A great idea which probably resulted in thousands of burnt exhaust valves!"
RJ _________________ Rick - Admin
Home:https://www.oldclassiccar.co.uk
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dclf1947
Joined: 23 Nov 2007 Posts: 107 Location: Laoag City, Philippines
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Posted: Wed Aug 15, 2012 12:50 pm Post subject: |
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"As the effect reduced engine braking, the valve had a "brake" position which closed it."
Interesting, but in that case the "Off" position must be the same function as "Brake". It would be good to see the back of the switch.
Has the inlet manifold got a tapping on it where the "extra air" could enter?
Nice accessory to have though, certainly will be a conversation booster at shows.
Dave
Philippines |
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