Unity Motorsports Garage dives into the deep subject of Vacuum Advance for Distributors. We take a look back and discuss this history of Vacuum Advance and talk to the #1 authority on the subject.. David Vizard. He goes into detail why most get it wrong on the street… The Point is… If you have a Hot Rod and you drive it on the street… A Vacuum Advance is a must if you plan on getting ANY fuel mileage!
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Andy
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Great channel! Thank you for your content. I was hoping you could get in a Q for DV for me! I want to know what happens when you put in a really long duration, tight LSA camshaft (300+ 106) and big tall intake on a poor engine, such as a good wrench 350. I can’t find the answers anywhere! I have searched for years and have read every DV book I can get ahold of. Even the A series book! If an A series can run a 300+ camshaft, why can’t a good wrench 350 run one in a very light car? (Under 2000lbs)?? Thank you!
Once again, great video and conversation piece! So, would you recommend running a “T” vacuum from the same source as the PCV? Or do you recommend a PCV at all? Thanks again! 👍🏻
Lol he looks like Austin powers Dad. Much respect your the man Mr. Visard I’ve learned tons from your videos thank you for your knowledge.
Your timing is perfect. (Pun intended). I am currently reading David Vizard's book, Super tune and modify Holley Carburetors. And have just come across the vacuum advance chapter. When this guy talks, I listen.
Where's part two at????
Great vid man… If I’m understanding this correctly, you’re using the vacuum pump to determine what the optimal amount of timing added by the canister would be? Any tips on determining what the optimal opening point on a vacuum advance would be? I’ve always heard 2” below idle vacuum, but I’m really interested to hear your take on that… Or will I have to wait for part 2 for this wisdom? 😉
Can’t thank you enough for doing this vid. It’ll come in handy for sure!
Great video andy now I’m gonna watch part 2. Always GREAT stuff you have for the viewers.
Man, this is pure gold, Im a big DV fan, and these days trying to dial in my vacuum advance curve on my 355 sbc using a te Crane vacuum can and limiter plate. Very glad I found this channel and thanks for sharing with us! Greetings from Norway
One of things we all haved done is thinking inside the box. I had to experiment with my 95 chevy 350 1/2 ton truck. The base timing is 0°from the service manual. I have changed it to 6°advance. After realizing that the 92 Camaro 350 TPI, 91 Corvette 350 TP and 95 Cadillac Fleetwood 350 TBI had a set timing of 6°. After driving it with a 6°base timing advance. Totaling between 26°total advance. I was surprised to to get an additional 5mpg to the gallon. Before it was 12 city and 15 hwy with a 13.2 +- avarage. Now I'm getting the average of 19.25 mpg. I'm assuming 15 city and 24 hwy. And the truck weighs 5000+ lbs. I had to get out of the box and try it for myself. The engine liked the extra 6°. Since I have to take a different approach since it has a Tuned Port Injection with a computer advance distributor. I have to give it baby steps. And find out where is the to motor and computer is the happiest in harmony. Thanks for this video.
Is there a way to apply that "wanted vacuum" procedure if you don't have cruise control?