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Street Stock Engines - Meet Vaccum Rules and Make …
https://www.motortrend.com/how-to/ctrp-0812-street-stock-vacuum-rules/
Vacuum rules are most common in Street Stock-level race classes where the idea is to force the racer to use as many stock or stock-replacement parts are possible. The idea is that the requirement...
beting vacuum rules - Don Terrill’s Speed-Talk
https://www.speed-talk.com/forum/viewtopic.php?t=46470
Vacuum rules just seems like a good way to cheat Yep these guys are the same no big blocks in short wheel base I may of found new race league that just goes by tire size and how many bolt ons and pump gas rule. We went and raced well drag raced with the country boy class got 5th out of 24. Had some valve float problems 5800rpm and it would float.
Vacuum rules - Don Terrill’s Speed-Talk
https://www.speed-talk.com/forum/viewtopic.php?t=5184
Another trick which can improve vacuum with a longer duration camshaft is to totally isolate the two planes of the intake. Make sure the intake manifold divider, spacer, gasket and carb baseplate seal so one half cannot see the other half. This will substantially increase the vacuum. thnx, jv. Jack Vines Studebaker-Packard V8 Limited
Engine Vacuum - Summit Racing Equipment
https://help.summitracing.com/app/answers/detail/a_id/5306/~/engine-vacuum
With less air/fuel, the engine cannot turn as fast. As the throttle blades open, restriction and vacuum are reduced. This allows more air/fuel into the cylinder and rpm increases. With the throttle wide open, airflow is maximized and vacuum is at its least. When you let off the throttle and the blades snap shut, rpm is still high.
Beating Vacuum Rules - Grease Monkey Hangout - Lone Star ...
https://www.lonestarspeedzone.com/topic/15960-beating-vacuum-rules/
For vacuum classes, you should use lobe separations of 114 or more. If you use all these items 114 will work. If not, you need to be closer to 120. Durations should be 240 @ .050 or less. 240 if you use these items and 220 if you don’t. This is based on 15 inches at 1000 rpm. Power adders that don’t need overlap;
Using Engine Vacuum to Diagnose Performance Issues ...
https://www.racingjunk.com/news/using-engine-vacuum-to-diagnose-performance-issues/
Vacuum decreases slowly when the pedal is put to the floor. It should drop almost to zero for an instant when you accelerate quickly. A restriction in either the intake or exhaust is indicated if the gauge shows vacuum decreasing slowly instead of quickly. Something like a plugged cat or muffler is usually the culprit here.
1.5 tailpipe rule and vacuum rule?? opinions?
http://www.racerhub.com/forum/showthread.php?24897-1-5-tailpipe-rule-and-vacuum-rule-opinions
been reading about some of the new topics for possible rule changes, waiting to see what they will be like everyone else,mainly because i wasnt able to complete my car in time to race last year and now am at the point of installing exhaust on my car . i've read where increasing the vacuum rule to 18.5 or so was said and that seems fair , especially a steady reading, not …
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.
Tech Talk #5 – Reher’s Rules: How to Keep Your Engine ...
https://rehermorrison.com/tech-talk-5-rehers-rules-how-to-keep-your-engine-alive/
You can see for yourself what happens to the oil in a full-length wet-sump pan by filling it with four quarts of water and rocking the pan forward and backward. Tilt the pan at a 66-degree angle to simulate what happens during a two “g” launch and deceleration.
2022 NHRA Rulebooks now available online | NHRA
https://www.nhra.com/news/2021/2022-nhra-rulebooks-now-available-online
16 Nov 2021. Posted by NHRA.com staff. News. The 2022 NHRA Rulebook and 2022 NHRA Summit Racing Jr. Drag Racing League Rulebook are now online and viewable by all who wish to compete in the NHRA ...
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