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1 What is Manifold Vacuum? - crankSHIFT
http://www.crankshift.com/manifold-vacuum/
Manifold vacuum is the partial vacuum that exists inside the intake manifold of a naturally aspirated Otto or two-stroke cycle engine.
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2 Compression and Vacuum
http://cf.linnbenton.edu/eit/auto/krolicp/upload/Compression_Vacuum.pdf
Manifold vacuum is used to show engine compression and is created between the ... working with engines you will be able to quickly identify vacuum lines.
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3 Everything You Wanted to Know About Vacuum Advance and ...
https://www.motortrend.com/how-to/1601-everything-you-wanted-to-know-about-vacuum-advance-and-ignition-timing/
With the engine turning highway rpms of between 2000-3000 rpm and the throttle cracked ever so slightly, manifold vacuum shoots way up. This ...
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4 Manifold vacuum | Autopedia - Fandom
https://automobile.fandom.com/wiki/Manifold_vacuum
Manifold vacuum is an effect of a piston's movement on the induction stroke and the choked flow through a throttle in the intake manifold of an engine. It is a ...
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5 How Does a Car Engine Create a Vacuum? - It Still Runs
https://itstillruns.com/car-engine-create-vacuum-12193724.html
Vacuum is the difference in pressure, usually measured in inches of mercury, between the interior of the intake manifold and ...
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6 Mastering the Basics--Reading A Vacuum Gauge - MOTOR
https://www.motor.com/magazine-summary/mastering-the-basics-reading-a-vacuum-gauge/
It's important to remember that manifold vacuum is used to power vehicle systems that need a steady supply of low-pressure air under all engine operating ...
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7 Understanding Vacuum Advance and Why You Need It
https://www.onallcylinders.com/2015/03/27/ask-away-with-jeff-smith-understanding-vacuum-advance-and-why-you-need-it/
It's also important to mention that in most applications, the vacuum advance canister is connected to what is called ported manifold vacuum.
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8 Car Engine Vacuum line basics | Repair | Leak leaks
https://www.enginebasics.com/Engine%20Basics%20Root%20Folder/Vacuum%20Basics.html
So why do I have so many vacuum lines coming off the intake manifold? ... Well, this is because that is where the vacuum is present. Since the intake manifold ...
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9 How Vacuum Advances Work - Bad Ass Engines
https://www.badasscars.com/index.cfm/page/ptype=product/product_id=451/category_id=64/mode=prod/prd451.htm
They don't normally run on what's called "manifold vacuum", but rather on ported vacuum, which is vacuum that comes-on only at part throttle ...
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10 Engine Performance Testing with a Vacuum Gauge - Actron
https://actron.com/content/engine-performance-testing-vacuum-gauge
A vacuum gauge shows the difference between outside atmospheric pressure and the amount of vacuum present in the intake manifold. The pistons in the engine ...
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11 Ported vs. Manifold Vacuum - Chevelle Stuff
http://chevellestuff.net/tech/articles/vacuum/port_or_manifold.htm
I finally sat down the other day and wrote up a primer on the subject, with the objective of helping more folks to understand vacuum advance and how it works ...
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12 Engine Vacuum Troubleshooting | Classic Car Restoration Club
https://www.classiccarrestorationclub.com/video/engine-vacuum-troubleshooting/
Classic Car Restoration Club
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13 What are vacuum lines and what is its function? - Quora
https://www.quora.com/What-are-vacuum-lines-and-what-is-its-function
Vacuum lines can have multiple functions. On old carburetor type cars it was for emissions regulations some dumb engineers thought it would be good for central ...
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14 What is ported vacuum? - Chevrolet Corvette Forum Discussion
https://www.corvetteforum.com/forums/c3-tech-performance/1514998-what-is-ported-vacuum.html
The only reason we have ported vacuum is because it reduces emissions. That is all. It does the same function as manifold vacuum advance except ...
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15 Ported vs manifold vacuum advance solved!!! | Page 2
https://www.forbbodiesonly.com/moparforum/threads/ported-vs-manifold-vacuum-advance-solved.212661/page-2
I tend to agree with @diesel_lv either can be made to work well with ... He does in fact advise against using manifold vac because of the ...
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16 Manifold vacuum vs performance - Mechanics Stackexchange
https://mechanics.stackexchange.com/questions/43042/manifold-vacuum-vs-performance
Manifold gauge vacuum is the difference between manifold absolute pressure and barometric pressure. The reason you see 0 inHG at WOT is ...
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17 Ported vacuum or manifold vacuum to Dist? - The Jalopy Journal
https://www.jalopyjournal.com/forum/threads/ported-vacuum-or-manifold-vacuum-to-dist.1019838/
When a load is applied to the engine and additional throttle is applied, vacuum DECREASES. All the distributors I've dealt with have a vacuum ...
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18 Diagnostic Dilemmas: The Pressures of Intake Manifold ...
https://www.underhoodservice.com/diagnostic-dilemmas-the-pressures-of-intake-manifold-vacuum-tests/
To adjust the idle air/fuel mixture, the technician would adjust the mixture screw to achieve maximum intake manifold vacuum and then open the adjustment screw ...
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19 What happens when distributor vacuum advance is connected ...
https://www.chevelles.com/threads/what-happens-when-distributor-vacuum-advance-is-connected-to-manifold-vacuum.94121/
Is there a delay when distributor vacuum advance is connected to manifold vacuum? I don't have a clear picture of how vacuum advance works.
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20 Manifold, Ported and Venturi Vacuum Explained
http://corvette-restoration.com/wp-content/uploads/technical_papers/vacuum_explained.pdf
visualize how this measurement works, imagine a U-shaped glass tube ... The most commonly recognized vacuum source in an engine is “manifold vacuum.
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21 Ported Vacuum and Manifold Vacuum, Distributor Connection.
https://www.trifive.com/threads/ported-vacuum-and-manifold-vacuum-distributor-connection.75136/
Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially ...
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22 Why Use Manifold Vacuum for Vacuum Advance Distributor?
https://board.moparts.org/ubbthreads/ubbthreads.php/topics/1048045/1/why-use-manifold-vacuum-for-vacuum-advance-distributor.html
Ported vacuum usually provides a more stable idle which is why the OEM's went that way. Manifold vacuum can work in certain applications such as ...
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23 Vacuum Advance - ported or manifold - Club Cobra
http://www.clubcobra.com/forums/all-cobra-talk/115100-vacuum-advance-ported-manifold.html
Anyone who says otherwise doesn't know what they're talking about. With it connected to manifold vacuum, you'll get lots of timing at idle and ...
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24 Here's How To Check for Vacuum Leaks and Fix Them
https://www.thedrive.com/maintenance-repair/40028/how-to-check-for-vacuum-leaks
First, let's talk about what a vacuum leak is. Internal combustion draws in air and fuel with the vacuum created by the downward motion of the ...
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25 ported vacuum vs manifold for advance - IH8MUD Forum
https://forum.ih8mud.com/threads/ported-vacuum-vs-manifold-for-advance.281765/
Manifold vacuum is below the throttle plate. You have the ported vacuum port. It is above and to the left of the transition slot at the shadow ...
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26 Tuning in a Vacuum - Street Muscle Magazine
https://www.streetmusclemag.com/tech-stories/tuning-in-a-vacuum/
Light throttle acceleration creates high manifold vacuum because the pistons are pulling against a highly restricted inlet.
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27 What is Manifold Pressure? - Wiki Motors
https://www.wikimotors.org/what-is-manifold-pressure.htm
This manifold vacuum is instrumental in the proper operation of an internal combustion engine. For instance, one way optimal fuel efficiency is ...
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28 Ported Or Manifold Vacuum Advance: Where To Source And ...
https://bangshift.com/general-news/videos/ported-or-manifold-vacuum-advance-where-to-source-and-when/
Does the witchcraft of vacuum advance keep throwing you? Here's a rundown on the difference between ported and manifold vacuum and where to ...
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29 Ported or manifold vacuum? - NastyZ28.com
https://nastyz28.com/threads/ported-or-manifold-vacuum.303230/
When do you use ported and when do you use manifold vacuum for your HEI? ... but it did a good job of optimizing engine efficiency, ...
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30 what edelbrock tech said about manifold or prted vac adv...
https://www.thirdgen.org/forums/carburetors/10530-what-edelbrock-tech-said.html
Using manifold vacuum will give you full advance when the engine is not under load. Under full throttle(near zero vacuum) the advance will be gone. Ported ...
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31 How does dual vacuum distributor work? - MyE28.com
https://www.mye28.com/viewtopic.php?t=145704
L jet throttle bodys I have and have seen do have a vacuum port on both sides. The difference between manifold vacuum and ported vacuum is the ...
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32 Engine Vacuum Leak: Symptoms and Solutions - LiveAbout
https://www.liveabout.com/engine-vacuum-leak-symptoms-4174856
If your vehicle has an engine vacuum leak, the air-fuel ratio in your engine will be higher than 14.7:1, also called a “lean” mixture.
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33 Anyone using manifold vacuum advance?
https://www.vintage-mustang.com/threads/anyone-using-manifold-vacuum-advance.1156752/
If you're not in those situations, I would strongly suggest you use manifold vacuum for any street-driven car. You will get better economy, ...
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34 Amazon.com: Vacuum Block Intake, Yctze 6 Port Vacuum ...
https://www.amazon.com/Yctze-Vacuum-Intake-Manifold-Wastegate/dp/B08F7ZFGZ1
Buy Vacuum Block Intake, Yctze 6 Port Vacuum Block Intake Manifold Kit Fuel Wastegate Turbo Boost 1/8NPT for Racing for vacuum manifold block vacuum port ...
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35 Poor manifold vacuum 355 - FerrariChat
https://www.ferrarichat.com/forum/threads/poor-manifold-vacuum-355.570988/
If you are asking about the bypass valve, then it uses the engine vacuum. Except that the engine charges a vacuum canister, which then feeds the ...
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36 ported or manifold vacuum for advance? - Ford Muscle Forums
https://www.fordmuscleforums.com/threads/ported-or-manifold-vacuum-for-advance.434159/
I know many people who swear that manifold vacuum makes their car run better. That's cool. I would advise working on your distributor ...
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37 Manifold Absolute Pressure MAP Sensors - AA1Car
https://www.aa1car.com/library/map_sensors.htm
When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine sucks in more air, which requires more fuel to keep the air/fuel ...
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38 Ported or manifold vacuum advance? - ClassicOldsmobile.com
https://classicoldsmobile.com/forums/showthread.php?t=113536
Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, ...
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39 How does the manifold pressure sensor work?
https://www.pilotsofamerica.com/community/threads/how-does-the-manifold-pressure-sensor-work.113231/
Operation is pretty simple. The MP sensor in the EMU sees the vacuum, measured in in/hg, created by the intake stroke of each piston. The ...
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40 View topic - Vac Advance: Manifold vs. Ported - TheSamba.com
https://www.thesamba.com/vw/forum/viewtopic.php?p=4746638
Vacuum advance is engineered to compensate for variable loading on the engine, and the only true measure of how the engine is loaded is via ...
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41 Initial timing-Ported vs Manifold vacuum - V8buick.com
http://www.v8buick.com/index.php?threads/initial-timing-ported-vs-manifold-vacuum.214464/
As there are two primary differences. The manifold vacuum one will allow you to crank the engine with lower advance and idle with a higher ...
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42 Ported vs Manifold Vacuum - PY Online Forums - PY Forums
https://forums.maxperformanceinc.com/forums/showthread.php?t=407054
If you were to connect manifold vacuum to the distributor, it would advance the timing during periods of high vacuum and retard the timing ...
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43 How to make vacuum advance work with low manifold vac.?
https://www.camaros.net/threads/how-to-make-vacuum-advance-work-with-low-manifold-vac.82393/
He says you need full vacuum advance at idle to bring the initial 10 degrees up to 25 degrees for a cleaner idle and cooler running engine.
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44 Symptoms of a Bad or Failing Manifold Absolute Pressure ...
https://www.yourmechanic.com/article/symptoms-of-a-bad-or-failing-manifold-absolute-pressure-sensor-map-sensor
At a perfect vacuum, the MAP sensor will read 0 psi. When the engine is running, the downward motion of the pistons create a vacuum inside the ...
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45 Ported vacuum or Manifold vacuum | Jeep-CJ.com
https://jeep-cj.com/community/threads/ported-vacuum-or-manifold-vacuum.11678/
Used for an off idle vacuum source when having vacuum supplied at idle wont work. Venturi Vacuum- vacuum source located above throttle plate in ...
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46 What You Need to Know About a MAP Sensor
https://technician.academy/map-sensor/
When the engine is running, a vacuum is created in the intake manifold by the pistons moving up and down and the restriction of the throttle ...
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47 Ported vs manifold vacuum for ignition advance?
https://www.speed-talk.com/forum/viewtopic.php?t=64230
It's just logical to do it that way. When manifold vacuum is high, cylinder pressure is low, so more advance is desired. When manifold vacuum is ...
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48 Ported or manifold for vacuum advance? - The 1947
http://67-72chevytrucks.com/vboard/showthread.php?t=686548
This advanced the spark instead of mechanical advance. So the vacuum signal would start at high vacuum at idle, go down to near-zero with the ...
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49 Distributor vacuum advance,Ported or Manifold?Why?
https://forums.off-road.com/threads/distributor-vacuum-advance-ported-or-manifold-why.120128/
The vacuum advance diaphram is to ADVANCE the timing as the speed increases. Manifold vacuum would advance it immediately at idle and hold ...
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50 Manifold OR Ported Vacuum Advance
http://www.69roadrunner.net/mopar/threads/manifold-or-ported-vacuum-advance.11790/
Vacuum advance only operates at light throttle cruising, it's purpose is to improve efficiency and economy. With any significant throttle ...
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51 How Does a Vacuum Gauge Work? - eHow
https://www.ehow.com/info_12130629_vacuum-gauge-work.html
This causes low pressure between the throttle plate and the valves that let air into piston chambers. Automotive vacuum gauges connected to the manifold read ...
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52 Timed (spark) port vs full vacuum port - The AMC Forum
https://theamcforum.com/forum/timed-spark-port-vs-full-vacuum-port_topic11416.html
With a carb manifold port, the port is just below the thottle blades so that port sees full manifold vacuum at all times. As far as how your ...
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53 vacuum advance...ported or manifold? - Ford Truck Enthusiasts
https://www.ford-trucks.com/forums/728640-vacuum-advance-ported-or-manifold.html
Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially ...
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54 What Is Manifold Pressure? - Pilot Institute
https://pilotinstitute.com/what-is-manifold-pressure/
Most normally aspirated engines have an inlet manifold that collects the air and fuel mixture from the carburetor and transfers it to each ...
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55 Idle Vacuum - Performance Trends
https://performancetrends.com/Definitions/Idle-Vacuum.htm
Idle Vacuum is the intake manifold vacuum when the engine is idling. The higher the vacuum, the more closed the throttle plates and the lower the amount of ...
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56 Vacuum adavance ported or manifold? - BinderPlanet.com
https://www.binderplanet.com/forums/index.php?threads/vacuum-adavance-ported-or-manifold.23597/
Ported works by engine rpm and throttle setting, not just rpm. lower throttle setting at cruise still means less ported vacuum than a higher ...
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57 Vacuum Advance, port vs. manifold - Y-Blocksforever Forums
http://forums.y-blocksforever.com/Topic153890.aspx?DisplayMode=1
I can provide either port or pure manifold vacuum to the distributor. ... but I do know it works up to 25* advance in the quick test I did.
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58 Ported v. Manifold Vacuum: How this helped me - Full Size ...
https://www.fsjnetwork.com/forum/viewtopic.php?t=7028
When you open the throttle against a load using this method, the fuel mixture is enriched and the falling vacuum level causes the advance module ...
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59 Anyone use manifold vacuum for their distributor's ... - Moparchat
http://www.moparchat.com/forums/engines/53071-manifold-vacuum-distributors-vacuum-advance.html
On the carb, one is timed vacuum, one is ported vacuum or manifold vacuum. You are not going to get "more" vacuum from the manifold than the ...
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60 Bob Johnstones Studebaker Resource Website (Vacuum ...
https://www.studebaker-info.org/Tech/Vacuum/portvxfullvacuum.html
Vacuum advance has absolutely nothing to do with total timing or performance, as when the throttle is opened, manifold vacuum drops essentially to zero, ...
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61 manifold vacuum on a turbo ??? - Old Gen. - ultimatesubaru.org
https://www.ultimatesubaru.org/forum/topic/18516-manifold-vacuum-on-a-turbo/
the switches in the car, hold vac, so the stuff even works when the car has sat for months. and your brake booster, is fine gettin boosted=].
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62 Vacuum Pumps: Why use them & what do they do?
https://www.gzmotorsports.com/why-use-vacuum-pump.html
How do Vacuum Pumps work? ... A vacuum pump has the inlet hooked up to one or both valve covers, sometimes the valley pan. It SUCKS the air from the engine, thus ...
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63 Manifold vacuum - Wikicars
https://wikicars.org/en/Manifold_vacuum
A pressure gauge measuring the manifold pressure can be fitted to give the driver an indication of how hard the engine is working and can be ...
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64 A vacuum test, can tell you, way more than you think.
https://dannysengineportal.com/vacuum-test-a-vacuum-test-can-tell-you-more-than-you-think/
Doing The Vacuum Test: · Connect the vacuum gauge hose, as close to the intake manifold as possible and start the engine. · Run the engine long ...
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65 ported or manifold vacuum for hei advance?
https://www.wranglerforum.com/threads/ported-or-manifold-vacuum-for-hei-advance.1505577/
› threads › ported-or-...
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66 Vac-Man® Laboratory Vacuum Manifold - Promega Corporation
https://www.promega.com/products/biochemicals-and-labware/tips-and-accessories/vac_man-laboratory-vacuum-manifold/
Some of these cookies are essential for our website to work. For others, we won't set them unless you accept them. To find out more about cookies and how to ...
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67 Making sense of your sensors: MAP sensor | Delphi Auto Parts
https://www.delphiautoparts.com/usa/en-US/resource-center/making-sense-your-sensors-map-sensor
When you start the engine, pressure in the intake manifold decreases creating a vacuum that is applied to the MAP sensor. When you press on the gas accelerator ...
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68 0 manifold vacuum @ WOT.. ?? N/A cars - CamaroZ28.com
https://www.camaroz28.com/forums/advanced-tech-38/0-manifold-vacuum-%40-wot-n-cars-539609/
Any vacuum reading in the intake tract is a sign of a restriction somewhere. You can work on it until Christmas and never find it but if you do ...
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69 Vacuum Manifolds - The Lab Depot
https://www.labdepotinc.com/articles/vacuum-manifolds-resources.html
Vacuum manifolds are commonly used for the final drying of samples removed from a rotary evaporator. Organic solvents and/or acids left behind during the ...
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70 How to: VACUUM TESTING
https://www.austincc.edu/wkibbe/vacuumtesting.pdf
How to Conduct the Vacuum Test. • Connect a tachometer and vacuum gauge to a none regulated vacuum source on the engine. • Disconnect and plug fuel vapor ...
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71 vacuum advance, ported or manifold
https://www.ramchargercentral.com/threads/vacuum-advance-ported-or-manifold.193026/
the only difference is, manifold vacuum gives advance at idle. other than that, it does the same thing. when you open the throttle plates, ...
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72 Carburetor Vacuum Ports: Manifold, Ported and Venturi ...
https://www.yumpu.com/en/document/view/45318443/carburetor-vacuum-ports-manifold-ported-and-venturi-vacuum-
It is strictly a function of airflow through theprimary venturi and the low pressure that this creates in the venturi. Manifold vacuum can be ...
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73 How does a vacuum manifold work? - HomeX
https://homex.com/ask/how-does-a-vacuum-manifold-work
How does a vacuum manifold work? The difference in air pressure between the engine's intake manifolds and Earth's atmosphere is known as the Manifold vacuum ...
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74 Vacuum Leak: Symptoms, Causes, How to Fix - CarParts.com
https://www.carparts.com/blog/vacuum-leak-symptoms-causes-how-to-fix/
› blog › vacuum-leak-sympto...
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75 Isn't Manifold "Pressure" actually a Vacuum - VAF Forums
https://vansairforce.net/community/showthread.php?t=66314
The pressure is in fact lower than atmospheric pressure, but don't think of it as a vacuum. In this condition, the throttle plate on the ...
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76 Ported vacuum advance vs manifold ... - The 'E' Type Forum
https://forum.etypeuk.com/viewtopic.php?t=12885
› ... › Technical
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77 Manifold vacuum advance vs ported vacuum advance
http://fordsix.com/threads/manifold-vacuum-advance-vs-ported-vacuum-advance.77634/
You're basically increasing the volume (but not area) of the vacuum side of the advance diaphragm. The size of the port it's fed from remains ...
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78 Ported VS Manifold Vacuum | Chevy Corvette Forum
https://www.smokinvette.com/threads/ported-vs-manifold-vacuum.49512/
The only thing ported vacuum does is prevent any vacuum advance from happening until the engine gains rpms. I use manifold vacuum on all of my ...
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79 Primer on Vacuum Advance, Manifold or Ported - Chevy Talk
https://www.chevytalk.org/fusionbb/showtopic.php?tid/58447/
Vacuum advance has absolutely nothing to do with total timing or performance, ... Retired, but working part-time on 50s-70s cars & trucks.
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80 Ported vs Manifold vacuum advance.
https://forum.mustang.org.au/index.php?topic=29304.0
Ported vacuum advance is an emission control technique to increase EGT, which promotes oxidation reaction in the exhaust, but it also increases ...
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81 Vacuum advance, timed or manifold? - Pirate 4x4
https://www.pirate4x4.com/threads/vacuum-advance-timed-or-manifold.716254/
Where did that info come from on the pollution control stuff? To work vacuum advance, it must come off of the timed port. Manifold vacuum is ...
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82 Ported vs manifold vac advance | Jeep Enthusiast Forums
https://www.jeepforum.com/threads/ported-vs-manifold-vac-advance.3866825/
Operationally ported vacuum will kick in as soon as you start to open the throttle and all will perform as it would with manifold vacuum and ...
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83 Ported or manifold Vacuum to Dist. | For A Bodies Only Mopar ...
https://www.forabodiesonly.com/mopar/threads/ported-or-manifold-vacuum-to-dist.446400/
That doesn't mean using manifold vacuum is wrong. Use whichever works best ... But whatever the distributor is set up for would work best.
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84 Making (and using) a vacuum manifold! - Pipette Jockey
https://pipettejockey.com/2020/06/20/making-and-using-a-vacuum-manifold/
Making (and using) a vacuum manifold! · What does the beastie do? · So, first things first, 3D print the body of the manifold. · Looking good, ...
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85 manifold or ported vacuum advance - DodgeTalk Forum
https://www.dodgetalk.com/threads/manifold-or-ported-vacuum-advance.355302/
so just out of curiosity, what do you guys use? i hate to start a battle of any kind. every forum i have read about this subject, ...
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86 Ported vs manifold vacuum | 460 Ford Forum
https://www.460ford.com/forum/37-engine-tech/137650-ported-vs-manifold-vacuum.html
Ported vacuum is a source above the throttle plates, and manifold vacuum is a source below the throttle plates. Ported vac tends to increase as ...
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87 Vacuum leaks: problems, symptoms, repairs - Samarins.com
https://www.samarins.com/glossary/vacuum-leaks.html
The engine computer (PCM) calculates how much fuel to inject based on the mass air flow sensor measurements. If there is a vacuum leak anywhere ...
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88 Ported or manifold vacuum for vacuum advance - 1973
https://www.gmsquarebody.com/threads/ported-or-manifold-vacuum-for-vacuum-advance.32581/
If I was to go ported vacuum I would not have the extra 6 degrees and have to turn the distributor to get 28 initial and then it start's to hard ...
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89 Vacuum pumps · Technipedia - MS Motorservice
https://www.ms-motorservice.com/en/technipedia/post/vacuum-pumps/
What types of vacuum pumps are available and how do they work? ... motor vehicles in which the necessary vacuum cannot be generated in the intake manifold.
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90 MAP Sensor | Cars.com
https://www.cars.com/auto-repair/glossary/map-sensor/
The manifold absolute pressure sensor reads the amount of pressure or vacuum (also called “engine load”) in the intake manifold, where outside air is ...
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91 Cam duration and manifold vacuum (a little off topic perhaps)
https://www.mgexp.com/forum/mgb-and-gt-forum.1/cam-duration-and-manifold-vacuum-a-little.2385917/
Regardless of how long the intake valves are open the intake stroke is going to draw in one cylinder's volume of air. How can this result in a ...
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92 Vac advance, ported or manifold? | Mustang Forums at StangNet
https://www.stangnet.com/mustang-forums/threads/vac-advance-ported-or-manifold.494412/
If you put it to manifold vacuum you will have maximun advance at idle and no advance under wide open throttle....exactly the opposite of how it ...
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93 How to Tell if You Have a Bad MAP Sensor - RepairPal
https://repairpal.com/map-sensor
at its core, an internal combustion engine is a vacuum pump. the pumping motion of the pistons causes a constant change of pressure in the ...
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