360 vaccuum question.
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Senior User
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From: DFW
360 vaccuum question.
I have a 1972 360 engine. I checked the vaccuum at the port at the distributor and no joy. I then checked it at the port on the base of the carb, no joy. The carb looks like it was replaced at some time as it seems too clean for a 42 year old carb. Is it possible that the yahoo that replaced the carb installed the gasket upside down covering the vaccuum port hole? Any ideas? Thanks...chris
Fleet Mechanic
Joined: May 2001
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From: Cupertino
If the engine is idling, it has vacuum.
Are you sure the gauge is good? Suck on it.
You should put your gauge directly on the manifold, not on the port above the throttle plate. See if you have another plugged-off port on the bottom of the carb. Also, tell us what carburetor you have.
Are you sure the gauge is good? Suck on it.
You should put your gauge directly on the manifold, not on the port above the throttle plate. See if you have another plugged-off port on the bottom of the carb. Also, tell us what carburetor you have.
Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
On a manifold vacuum port there would be. But not on a "timed" vacuum port. I could be wrong but I thought 72 was before emissions ka-ka so therefore would have a manifold vacuum port on the Autolite 2V. Especially if OP has a Holley 2V.
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Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
Timed or "spark" vacuum ports have been used since at least the 1930s long before emissions ever became a consideration, don't know how that idea got started. There's only one vacuum port on the 2V carbs? They are all above the throttle plate afaik. So no vacuum at idle.
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Hotshot
Joined: Mar 2013
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From: Phoenix, Az.
Pretty sure there was Ted. That's why sometimes the was a carb spacer to isolate carb from heat and introduce a port out back for a booster. As I recall Ford didn't use a timed port until the EGR valves. Then later for smog pumps,dual diaphragm Dizzys,etc.
Post Fiend
Joined: Apr 2002
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From: Waterloo, Iowa
Well, we don't know what carburetor is installed in this application or where it's hooked up. Didn't want to get this off into the weeds, but wanted to point out there may not be any vacuum at idle RPM. I do know a timed vacuum port predates smog era by decades, fwiw.
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Joined: Mar 2013
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From: Phoenix, Az.
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From: DFW
The engine runs great. However, when I hit the gas there is a hesitation. That is why I figured the vaccuum advance was not working. I am an old time mechanic, early 60's, that is trying to remember the old engines. There is only one vaccuum port on the base of the carb. No ports on the manifold. After supper , I will look to see what carb is on the engine. I looked this morning but I can 't remember now.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
The engine runs great. However, when I hit the gas there is a hesitation. That is why I figured the vaccuum advance was not working. I am an old time mechanic, early 60's, that is trying to remember the old engines. There is only one vaccuum port on the base of the carb. No ports on the manifold. After supper , I will look to see what carb is on the engine. I looked this morning but I can 't remember now.
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Senior User
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From: DFW
The accelerator pump works ok. I get engine vaccuum when I increase the throttle. There is a plastic filter of some kind in the vaccuum line to the distributor. I get vaccuum to the filter but none through the filter. Clogged filter. I ran a new line direct to the distributor. The engine seems to accelerate better. I will have to wait until tomorrow to see if the vaccuum advance is indeed working. Thanks for your help. I haven't worked on a carb engine for 30 years and my memory is not what it used to be, I am 71.....chris