Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 12-07-2020, 01:34 PM   #1
Oldgearz
Senior Member
 
Join Date: Aug 2020
Location: Sagle, Idaho
Posts: 359
Default Position of Indicator on Choke/GAV Rod

Now I know this doesn't really affect how the car runs, but in what position should the little indicator on the choke/GAV knob be in when the GAV is closed?
It just dawned on me that the last time I had the carb off I didn't pay any attention to this when I reconnected the GAV rod, so my smoothest running position changed by 180 degrees. I thought that was caused by the rebuild I did. My GAV is currently closed at 9:00 o'clock. What was the setting of the indicator when it came from the factory?
Oldgearz is offline   Reply With Quote
Old 12-07-2020, 02:16 PM   #2
Gary WA
Senior Member
 
Gary WA's Avatar
 
Join Date: May 2010
Location: Clinton,WA/Whidbey Island
Posts: 4,088
Default Re: Position of Indicator on Choke/GAV Rod

Mine all are at 9 oclock position when closed
Attached Images
File Type: jpg cars.jpg (66.3 KB, 12 views)
__________________
www.whidbeymodelaclub.com
Gary WA is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 12-07-2020, 02:31 PM   #3
abachman3
Senior Member
 
abachman3's Avatar
 
Join Date: Jun 2013
Location: Western Springs, IL
Posts: 323
Default Re: Position of Indicator on Choke/GAV Rod

It is really an arbitrary position. It depends on the carburetor choke driver and its seated position. They are not all the same due to how far into the carburetor one tightens the driver seat.
abachman3 is offline   Reply With Quote
Old 12-07-2020, 03:08 PM   #4
Synchro909
Senior Member
 
Synchro909's Avatar
 
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 7,472
Default Re: Position of Indicator on Choke/GAV Rod

I've had the knob come lose on the rod. I paid NO attention to its orientation when I secured it again but it could have been anywhere.
__________________
I'm part of the only ever generation with an analogue childhood and a digital adulthood.
Synchro909 is offline   Reply With Quote
Old 12-07-2020, 03:58 PM   #5
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: Oregon
Posts: 5,947
Default Re: Position of Indicator on Choke/GAV Rod

There is no proper orientation. It all depends on where the knob ended up in manufacture and what carb is used. Turn the GAV as near closed as the engine allows.
J Franklin is offline   Reply With Quote
Old 12-07-2020, 06:26 PM   #6
Oldgearz
Senior Member
 
Join Date: Aug 2020
Location: Sagle, Idaho
Posts: 359
Default Re: Position of Indicator on Choke/GAV Rod

Sponsored Links (Register now to hide all advertisements)
Thanks all. I'l stick with 9:00 o'clock.
Oldgearz is offline   Reply With Quote
Old 12-07-2020, 06:53 PM   #7
WHN
Senior Member
 
Join Date: Mar 2017
Location: Connecticut Shoreline
Posts: 1,815
Default Re: Position of Indicator on Choke/GAV Rod

Our 29 with a Zenith 1 carburetor is closed at 4:00.

When you close it, don’t snug it down tight.

Enjoy.
WHN is offline   Reply With Quote
Old 12-07-2020, 08:59 PM   #8
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: Oregon
Posts: 5,947
Default Re: Position of Indicator on Choke/GAV Rod

Quote:
Originally Posted by Oldgearz View Post
Thanks all. I'l stick with 9:00 o'clock.
If you do that you may end up running too rich or lean. Set it where the car runs best considering the conditions, cold more open and warmed up fully it may need to be fully (not tight) closed. the knob will be in the clock position it needs to be.
J Franklin is offline   Reply With Quote
Old 12-08-2020, 10:29 AM   #9
Purdy Swoft
Senior Member
 
Purdy Swoft's Avatar
 
Join Date: May 2010
Location: Alabama
Posts: 8,099
Default Re: Position of Indicator on Choke/GAV Rod

Mine are usually at six oclock when fully closed . Most run good at three oclock after a brief warm up .
Purdy Swoft is offline   Reply With Quote
Old 12-08-2020, 01:22 PM   #10
DBrer
Senior Member
 
Join Date: Oct 2019
Location: Washington
Posts: 175
Default Re: Position of Indicator on Choke/GAV Rod

Closed at 1:00, runs nice at about 11:00
DBrer is offline   Reply With Quote
Old 12-08-2020, 02:59 PM   #11
Ed in Maine
Senior Member
 
Join Date: May 2010
Location: Washington Cty., ME or Flagler Cty., FL
Posts: 1,106
Default Re: Position of Indicator on Choke/GAV Rod

Just to add another variable to this discussion, it also depends on the size of the Main Jet. Published flow data indicates that this jet (which is directly connected to the carburetor bowl) is 150 ml/min to 160 ml/min. I have found that when I rebuild a carburetor that has a Main Jet calibrated at 160 ml/min, that it greatly reduces the need for the GAV to be open. Note that the GAV is putting gas into the Cap Jet that is next to the Main Jet in the carburetor throat. Well, this is no fun because part of the fun of driving a Model A is adjusting the GAV to meet the driving conditions. Now, I strive to set the Main Jet at a flow rate of 156 ml/min or less down to 150 ml/min so that some supplemental gas from the GAV is required. I like J Franklin's take on all this, "the GAV will be at the clock position it needs to be". Ed
Ed in Maine is offline   Reply With Quote
Old 12-08-2020, 03:33 PM   #12
Mister Moose
Senior Member
 
Mister Moose's Avatar
 
Join Date: Jun 2020
Location: Hartford area, CT
Posts: 374
Default Re: Position of Indicator on Choke/GAV Rod

It's 5 O'clock somewhere.
Mister Moose is offline   Reply With Quote
Old 12-08-2020, 06:44 PM   #13
Joop
Senior Member
 
Joop's Avatar
 
Join Date: May 2010
Location: Glendale, AZ
Posts: 2,939
Default Re: Position of Indicator on Choke/GAV Rod

From the owners manual for late 1931 and early 1931 see the GAV rod position
Attached Images
File Type: jpeg C0B8CCD1-2814-4564-8496-FD21628858B9.jpeg (56.2 KB, 44 views)
File Type: jpeg 6D14461E-D0AD-4340-B4C6-D91D41B583B6.jpeg (56.1 KB, 39 views)
Joop is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 01:39 AM.