Where to hook up vacuum gauge
Make sure you've connected things properly. Base of carb is best place. The readings in Scenario 1, 2 and 3 below are normal readings taken from a properly functioning engine. 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.
Steady Low/Extremely Low
The swing on the gauge is usually anywhere from 10 to 22 inches of mercury, depending on the speed of the engine. Switch to Hybrid Mode.
You must log in or sign up to reply here. Boost and What You Need to Know.
The gauge at left shows an extremely low reading, which holds fairly steady. Inhe helped establish OnAllCylinders, where he enjoys covering all facets of hot rodding and racing.
Recent Comments William hernandez: That pressure corresponds to the weight of air holding a column of mercury A vacuum gauge is an invaluable resource for tracking down engine issues.
Send a private message to Big Dave. You need only recognize a "flicker" from a "sweep. Many distributors were designed to get advance vacuum only when the throttle plate was opened, in which case there was no vacuum at idle. Remove the same vacuum hose and install about two inches of vacuum hose onto the port. No, create an account now.
Few tools or test devices are more useful and versatile than a vacuum gauge, yet very few hobbyists own one. What does a rapid fluctuation at in of one inch with a erratic barely visible flick down to 14 inches mean in a four cylinder ecotec 2. Find all posts by Jackel. Higher elevations may cause slightly lower readings. Mar 22nd, 09 Hook up aps every 1, feet where to hook up vacuum gauge sea level, you can expect the reading to be about one inch lower.
A larger cam in a small cubic inch motor explains hook up amp reason for a lower vacuum signal.
Chrysler Forum Chrysler Forum cForums. If you notice the needle slowly fluctuating between four or five inches, chances are you have an ignition-related issue.
The Gauge Face
As mentioned the degree reading is normal for stock cammed engines. Aug 25, 4. With exhaust restriction, the vacuum gauge will often start in the normal range but will soon drop drastically as rpm is increased.
Apr 14th, 09 If you are using a vacuum gauge for testing you can now install it onto the T-fitting and perform your tests.