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This particular 7200 VV illustration/application shows a choke housing cooling air source (hose from air horn -clean filtered outside air) to choke motor to keep cool the electric choke cap.
There must be variations on this particular design with differing applications.
This particular 7200 VV illustration/application shows a choke housing cooling air source (hose from air horn -clean filtered outside air) to choke motor to keep cool the electric choke cap.
There must be variations on this particular design with differing applications.
THANX! for the VV Manual reference...
I think you are correct, that high up hose connection is for filtered air. I am not so sure about your "cooling air source" description. They way it usually works, they have a controlled vacuum leak leading to the round black choke housing. This sucks air through the choke housing, and the source for the air is usually from the exhaust manifold or some other heat source. Of course the air has to come from somewhere, and they usually get it from up high on the carb around the air horn.
On the carbed pictured above, I would be curious to see what it looks like underneath the choke pull-off area. I would not be surprised to find a port leading to underneath from that hose, and some sort of tubing or some sort of heat stove under there and then another pipe leading up to the round choke housing.
Admittedly I know nothing about the original poster's questions, and know nothing about the carb pictured above. My comments are from what have have seen as the common way they do things with most of the choke systems on different brand and kinds of carbs.
They way it usually works, they have a controlled vacuum leak leading to the round black choke housing. This sucks air through the choke housing, and the source for the air is usually from the exhaust manifold or some other heat source. Of course the air has to come from somewhere, and they usually get it from up high on the carb around the air horn.
What you are describing is the older choke stove design where the choke cap spring was heated by hot air from the exhaust manifold. FORD went electric cap with oncoming emissions regulations.
The choke design on the VV (also carbs of the period) used this to prevent the CM from overheating and may have allowed choke modulation.
I don't know how the discussion went to VV CARB either but I have learned and shook a few cobwebs loose...
The OP was just curious to the definitions to the acronyms on his vacuum hose routing map. He has a Holley now, Ford went to Holley as well and gave this 7200 up.... Yeah, it got my curiosity up as well.
That is a fresh air line going into the Choke Diaphragm, no manifold vacuum, seems there is a built in electric heater. The 7200 manual explains it a bit.
Last edited by vjsimone; May 28, 2017 at 10:07 PM.
Reason: Modify Text
Ok, so I just pulled out my Haynes, 80' thru 88' manual. Low and behold....
Page 150, shows the fresh air port AND a "Choke Control Diaphragm" port on the housing.
Bingo, you guys are right. I must have looked at 50 pictures today and no joy on 2 ports, until just now. So I'm on Board that CM is "Choke Control Diaphragm".
The tee in the fresh air supply tube (shown on this particular application schematic) must be to supply filtered outside air to the VOTM and EGR controlling solenoids.
BINGO 2!
My mistake in labeling V for Venturi Valve.
The tee in the fresh air supply tube (shown on this particular application schematic) must be to supply filtered outside air to the VOTM and EGR controlling solenoids.
I was on board with the Venturi idea as well, and there is a Venturi Valve in that rare beast, and I was just as driven as you to prove the CM symbol. As long as I am learning something, time is well spent.
I'd say the OP, may still need some advise as he sorts out his vacuum lines to his Holley, maybe more to follow..
Well, one of the great things about this site and guys like you, Gary & Dave, and of course, many others, is the collaborative effort. No way this and these results would have been achieved alone without the checks and balances.
Thanks, guys. I'll capture these results on my web site later today. But, some of the above is specific to the 7200VV and I'd like to capture it that way. So, which ones?
And, btw, my daughter's name is Holly and she is not named for the Holley carbs.
Thanks, guys. I'll capture these results on my web site later today. But, some of the above is specific to the 7200VV and I'd like to capture it that way. So, which ones?
Actually, all apply to that period (mechanical operated) and the current period (computer operated). Most of the same circuits were used with the 2150 and 4300.
Where he is having trouble with the HOLLEY (whether STD or Emissions Model) might be answered with schematics from the 4180 HOLLEY install of the period.
And, btw, my daughter's name is Holly and she is not named for the Holley carbs.
As I think about it, whether or not it is VV-specific doesn't matter. So, I've added it all here: Vacuum Diagrams - ???Gary's Garagemahal. Please check it out and let me know if it isn't correct.
What you are describing is the older choke stove design where the choke cap spring was heated by hot air from the exhaust manifold. FORD went electric cap with oncoming emissions regulations.
The choke design on the VV (also carbs of the period) used this to prevent the CM from overheating and may have allowed choke modulation.
I don't know how the discussion went to VV CARB either but I have learned and shook a few cobwebs loose...
That picture is exactly what I was talking about. And I think I am right in saying Ford never used a fully electric only choke. They called it a "electric assist". Just like the diagram above, they used the electric element AND the hot air from the heat stove also. It has been explained to me that the electric element only heated above 60 degrees F to help the choke spring pull off faster during warmer weather.
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