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Mechanical Advance Vs. Vacuum Advance - It Still Runs
https://itstillruns.com/mechanical-advance-vs-vacuum-advance-7853424.html
Vacuum Advance vs. Mechanical Advance--What's the …
https://www.onallcylinders.com/2020/10/28/ignition-timing-101-vacuum-advance-vs-mechanical-advance/
And can you really use vacuum advance in boosted applications? While we could do separate articles on all those questions, it’s easier to show …
Vacuum Vs. mechanical advance | Hot Rod Forum
https://www.hotrodders.com/threads/vacuum-vs-mechanical-advance.51012/
This happens from a dead stop (medium to hard acceleration) and when cruising as I hit the throttle. I have a Mallory Unilite Comp 9000 distributor ( mechanical / breaker- less) in a 350 Chevy motor (8.5/1 compression,a mild performance cam, headers,air gap manifold, 670 Holley). It has been suggested that a distributor with vacuum advance (HEI) would eliminate …
Vacuum advance vs mechanical advance - Ford Muscle Cars Tech …
https://www.fordmuscleforums.com/threads/vacuum-advance-vs-mechanical-advance.435594/
At part-throttle cruise, the mixture is leaner so burns slower and cylinder pressure is less, so the vacuum diaphragm uses manifold vacuum to add extra spark advance for better fuel economy. If your carb is too small, at high RPM your engine may be developing some intake vacuum even at full throttle, which could add too much timing and cause detonation, so …
Vacuum or Mechanical Advance? | Factory Five Racing Forum
https://www.ffcars.com/threads/vacuum-or-mechanical-advance.185588/
Which is better for a street engine. I have a 302/350hp Engine Factory engine that came with vacuum advance. ... Factory Five Racing Roadsters. Factory Five Roadsters. Vacuum or Mechanical Advance? Jump to Latest Follow 1 - 7 of 7 Posts. FFR5452 · Charter Member. Joined Jun 3, 2007 · 4,717 Posts . Discussion Starter · #1 · May 27, 2008 ...
Vacuum vs. mechanical advance distributors - The H.A.M.B.
https://www.jalopyjournal.com/forum/threads/vacuum-vs-mechanical-advance-distributors.1055543/
Generally speaking, vacuum advance (in conjunction with mechanical advance) will add 4-6 MPG at cruising speed as well as reducing engine temps at idle/low engine speeds. One reason it usually isn't seen on race motors (besides the fact that it doesn't operate at WOT) is at high RPMs, the movable points plate can introduce spark scatter/timing errors.
Mechanical Advance or Vacuum | Team Chevelle
https://www.chevelles.com/threads/mechanical-advance-or-vacuum.264858/
392 Posts. #5 · Mar 15, 2009. Only show this user. My 383 witha bit bigger cam likes 16 initial 34 total @3000rpm with 12 degree's of vac advance all in at 12-14 in vac (hooked to manifold). Motor idles @ 750 somthin with 16-17 inches of vacuum. You'll probabably be close to that depending on comp & heads. Save.
vacuum or mechanical advance? | Team Camaro Tech
https://www.camaros.net/threads/vacuum-or-mechanical-advance.114825/
I plan to run the car at a test and tune for the first time in more than a year and since, I've done all sorts of suspension work on it. I'm hoping for the 24th at Bremerton. It occurs to me, I run a MSD-8360 distributor. I seem to remember that I …
Quick Tech: Why You Still Need Vacuum Advance
https://www.motortrend.com/how-to/quick-tech-still-need-vacuum-advance/
While it's true that vacuum advance can boost economy slightly, that's just one of the many possible positive effects that can result from its ability to improve overall engine efficiency. And...
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/
So based on this, you can see that having a curve in the distributor along with vacuum advance is a good thing as it reduces low-speed timing where the engine might detonate with too much timing but it can also benefit from more timing at part throttle than what is required at wide open throttle.
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