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The Pros and Cons of Racing Vacuum Pumps - Dragstuff
https://www.dragstuff.com/techarticles/vacuum-pumps.html#:~:text=When%20your%20motor%20reaches%20the%20pre-set%20level%20of,order%20to%20avoid%20potential%20problems%20with%20wrist%20pins.
Ideal Vacuum at WOT? | Team Chevelle
https://www.chevelles.com/threads/ideal-vacuum-at-wot.357670/
Supposedly 1350 CFM total--rated as a two-barrel. Re-rate that system at the four-barrel standard of 1.5 inches of vacuum, and the CFM rating drops to about 950 cfm. If you had only .5 inches of vacuum, the flow would be even less. Someone with a mathematics background could calculate it, but I bet it's around 600 cfm.
1.8 inches of vacuum at wot - Don Terrill’s Speed-Talk
https://www.speed-talk.com/forum/viewtopic.php?f=1&t=52865
Using a vacuum gauge (or MAP) to find restrictions in the intake is fairly easy. Outside the air cleaner is atmospheric or zero vacuum (or 29.92"Hg from the MAP). At idle your intake has highest vacuum but a race motor will be less than 12"Hg while a street motor will have like 18"Hg vacuum in the intake behind the throttle blades.
The Pros and Cons of Racing Vacuum Pumps - Dragstuff
https://www.dragstuff.com/techarticles/vacuum-pumps.html
When your motor reaches the pre-set level of vacuum, the valve opens and allows air into the motor. We highly recommend running one and setting it at approximately 15" of vacuum for a drag racing application. You really don't want to run over 15" in order to avoid potential problems with wrist pins.
Vacuum @ WOT - The BangShift.com Forums
https://bangshift.com/forum/forum/bangshift/tech-section/964161-vacuum-wot
Look at it like this a 650cfm carb can flow 1200cfm, but you'll be pulling about 6 inches of vacuum in the manifold to do it. Holley rates their carbs at 1.5 inches of manifold vacuum, if the vacuum is high than that the carb will flow more than it is rated for, if it's lower than that it will flow less than what it is rated at.
Vacuum at WOT with HP 1000 - racingfuelsystems - Tapatalk
https://www.tapatalk.com/groups/racingfuelsystems/vacuum-at-wot-with-hp-1000-t1640.html
I noticed it would climb up to 4-5" Hg at WOT on the primary alone, (2bbl). It ended up with #76 PMJ, .076" PVCR and 10" PV. # 94 SMJ With a 6.5 high flow PV the vacuum at high RPM was enough to not let the PV open all the way, or actually, as the vacuum climbed it pulled the PV back to partly closed and the A/F would drift lean as the RPM went up.
WOT vacuum - Team Camaro Tech
https://www.camaros.net/threads/wot-vacuum.198694/
8,339 Posts. #2 · Aug 12, 2011. Only show this user. Ported vacuum and manifold vacuum are identical with the throttle open and are an indicator of air restriction. At wide open full load, manifold vacuum should be zero unless there is a system restriction like too small of a carb.
Tech: Boost And Vacuum - Finding Hidden Horsepower
https://www.dragzine.com/tech-stories/engine/tech-boost-vacuum-finding-hidden-horsepower/
Tech: Boost And Vacuum – Finding Hidden Horsepower. By Eric Kvilhaug January 29, 2015. Professional drag racing is a world measured in hundredths of a second on the track and ounces on the scales. Technology is taking over every aspect of drag racing, from parts that are stronger and lighter, to engines that make more horsepower than ever ...
Tech Talk #24 – Panning for Power | Reher Morrison …
https://rehermorrison.com/tech-talk-24-panning-for-power/
We use an adjustable air bleed (essentially a controlled leak) to regulate the maximum pan vacuum to between 10 and 12 inches. With the wet-sump system we install on our Super Series bracket racing big-blocks, we see no fluctuations in oil pressure at this vacuum. In the high-tech pursuit of horsepower, racers sometimes overlook the basics.
Using Engine Vacuum to Diagnose Performance Issues
https://www.racingjunk.com/news/using-engine-vacuum-to-diagnose-performance-issues/
Something like a plugged cat or muffler is usually the culprit here. As stated, a “stock” engine should pull 17-21 In/Hg of vacuum at idle. The cool thing about using a vacuum gauge to diagnose engine problems is that different engine problems show themselves by vacuum readings in different ranges.
Manifold vacuum at WOT | For B Bodies Only Classic Mopar Forum
https://www.forbbodiesonly.com/moparforum/threads/manifold-vacuum-at-wot.75602/
At the drag strip, I leave my vacuum advance hooked up because I believe the vacuum drops to near zero during WOT for the entire run..... He, on the other hand, is trying to tell me that the vacuum is coming back to as high as 8" near the end of the run, activating the advance unit and reducing power.
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