Everything You Wanted to Know About Vacuum Advance and Ignition Timing

I had my vacuum advance hooked up to the ported vacuum port after reading this article I hooked it up to full manifold vacuum adjusted the idle rpm. The car has so much more power now. As many of you are aware, timing and vacuum advance is one of my favorite subjects, as I was involved in the development of some of those systems in my GM days and I understand it. Many people don’t, as there has been very little written about it anywhere that makes sense, and as a result, a lot of folks are under the misunderstanding that vacuum advance somehow compromises performance. Nothing could be further from the truth. 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 together with initial timing and centrifugal advance to optimize all-around operation and performance. I have this as a Word document if anyone wants it sent to them – I’ve cut-and-pasted it here; it’s long, but hopefully it’s also informative. This requires that lean mixtures have “the fire lit” earlier in the compression cycle spark timing advanced , allowing more burn time so that peak cylinder pressure is reached just after TDC for peak efficiency and reduced exhaust gas temperature wasted combustion energy.

Carburetor Tuning the Scientific Way

Feared by many, and ignored by many more, the vacuum advance can is an important component of your ignition platform that offers both performance and economy. Leaving it unplugged is akin to throwing free engine efficiency straight down the drain. To fully understand why the vacuum advance can is a necessity in any street-going car, we need to dive into spark timing as a whole and cover some ignition basics.

Why do I need ignition advance at all?

Sep 04,  · Hello, I’ve noticed people have been hooking up the vacuum advance to the port on the baseplate and not on the metering block. One guy said his .

All About Car Restoration How to Use and Interpret a Vacuum Gauge Few tools or test devices are more useful and versatile than a vacuum gauge, yet very few hobbyists own one. A vacuum gauge can tell as much about the internal and external workings of an engine as the combination of a voltmeter, compression gauge, stethoscope and timing light. An engine’s vacuum readings can tell an awful lot about its running parameters, provided you know how to read the gauge in the first place.

Unfortunately, most vacuum gauge manufacturers don’t provide easy-to-follow instructions and diagrams to help users interpret gauge readings, rendering the gauges themselves virtually useless. We’re here to change all that, so follow along with us on a tour of vacuum gauge readings and we’ll show you all the neat things you can do with one. That pressure corresponds to the weight of air holding a column of mercury Vacuum is by definition: In engines, of course, the air is being sucked in by the vacuum created by the movement of the pistons.

The Gauge Face All vacuum gauge faces are graduated in inches of mercury, although some have additional scales in millimeters of mercury. Note also that most vacuum gauges are equipped with an additional scale that measures fuel pump pressure. This allows the user to connect the hose directly to the fuel line entering the carburetor to measure the fuel pump’s pressure. Since many fuel system problems can be traced to the pumps themselves, such a tool can save a lot of troubleshooting time.

Is this a great tool, or what?

Tune Your Vacuum Advance for Better Drivability

Remove all the attachments and set them aside for step 7. Place the canister in the sink. In the back of the canister there is a little lever mine is orange that removes the top and bottom of the canister from one another. Pull up on it, and give it a little umph, and it should come off.

Mar 25,  · How does the engine run if you hook up the vacuum line to the carb, with the end that goes to the vacuum advance disconnected? If the same crappy way, then the diaphragm inside the vacuum advance is shot.

For more examples, see my article: Yet it’s a vacuum there. The thing is that of course it was a sunny day for the astronauts – you tend to forget when you see the black sky. On Earth some of the light comes to the landscape from the sun and some reaches us indirectly from the blue sky and the clouds. On the Moon, much of the light comes from the sun, but a lot of light also comes indirectly from the landscape itself.

That’s why you can see detail in the shadows, and why they aren’t completely black on the Moon.


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Dec 02,  · Footage taken from Holley Carburetor Installation & Tuning DVD.

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Vacuum Gauge is an Invaluable Tool when Diagnosing Engine Problems

The following is what I do to set up a Mallory dual point dist on a 59AB engine. The Mallory distributors I’ve been seeing the last few years are coming from the factory with the centrifugal advance stops set for about degrees centrifugal advance! Add in the typical degrees initial advance and it gives anywhere from 45 to52 degrees total advance. Way to much in my opinion.

Jan 12,  · For a vaccum advance there are 2 ways you can hook it up. 1. With vaccum going to the vaccum advance at idle (manifold vaccum) 2. Without vaccum advance going to the vaccum advance at idle (ported vaccum).

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Distributor advance

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This vacuum canister produces degrees of advance but requires 14 inches of vacuum to deliver its maximum timing. At 2, rpm, the combination of initial and mechanical deliver 36 degrees.

I found alot of helpful tips and designs. Ultimately I settled on components from several different designs. My design is by no means perfect, but it gets the job done, and was fairly cheap to build. It is capable of forming a piece 33″ x 22″. Add Tip Ask Question Step 1: Basic Box I started with a basic five sided wood box out of half inch particle board.

This will be the infrared “oven”. Thats pretty straight forward. Add Tip Ask Question Step 2: Heat Source also Keeps Your French Fries Warm As I said, I researched many different designs before I started and found that I preferred the infrared lamp as my heat source because, well frankly, I thought I’d burn my house down if I tried to build my own heating element.

I even considered buying three electric pancake griddles, bolting them side by side into a box, and placing that over the plastic sheet. I tried it with one griddle and it worked pretty well, though my wife was not pleased with me disappearing into the garage with it. I used a total of ten infrared heat lamps that you can purchase at any hardware store.

Holley Carb: Ported vs Manifold Vacuum Advance (CARB BASICS PART 1.5)