C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Vacuum Question

Thread Tools
 
Search this Thread
 
Old Apr 1, 2008 | 01:57 PM
  #1  
mcfack's Avatar
mcfack
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 201
Likes: 0
From: The Ham AL
Default Vacuum Question

If you have a higher lift cam in the engine, would you expect a lower vacuum?

I understand that good vacuum on a stock engine is around 18-20 inches of Hg.

I have confirmed that my vacuum at idle is 11-12 inches of Hg.

I haven't had my car long and it sounds and feels like I could have a different cam.

What do ya'll think?
Reply
Old Apr 1, 2008 | 02:53 PM
  #2  
CFI-EFI's Avatar
CFI-EFI
Race Director
10 Year Member
 
Joined: Sep 2000
Posts: 17,298
Likes: 32
From: The Top of Utah
Default

Originally Posted by mcfack
If you have a higher lift cam in the engine, would you expect a lower vacuum?
NO. Lift and vacuum are totally unrelated. The same is NOT true of duration, and/or overlap, however.

RACE ON!!!
Reply
Old Apr 1, 2008 | 10:08 PM
  #3  
Eddie & the Cruisers's Avatar
Eddie & the Cruisers
Burning Brakes
 
Joined: Apr 2006
Posts: 765
Likes: 0
From: Houston Texas
Default

Originally Posted by CFI-EFI
NO. Lift and vacuum are totally unrelated. The same is NOT true of duration, and/or overlap, however.

RACE ON!!!
If your vacuum level was at spec for a stock LT1 before cam swap to LT4 Hot Cam, about how much would it drop from the stock cam?
Reply
Old Apr 2, 2008 | 08:19 PM
  #4  
mcfack's Avatar
mcfack
Thread Starter
Instructor
 
Joined: Feb 2008
Posts: 201
Likes: 0
From: The Ham AL
Default

bump
Reply

Get notified of new replies

To Vacuum Question





All times are GMT -4. The time now is 11:04 AM.

story-0
2027 Corvette vs The World: Every Model vs Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-20 17:58:41


VIEW MORE
story-1
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-2
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-3
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-4
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-5
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-6
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE
story-7
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!

Slideshow: Breaking down the 2027 Grand Sport, Grand Sport X, Stingray, and LS6 V8.

By Michael S. Palmer | 2026-03-26 13:48:45


VIEW MORE
story-8
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!

Slideshow: 5 reasons bad drivers crash sports cars & 5 ways to avoid a costly shame!

By Joe Kucinski | 2026-03-25 16:32:55


VIEW MORE
story-9
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette

Slideshow: Check out these easy-to-install upgrades from Extreme Online Store that reshape the look and feel of the C6 Corvette.

By Pouria Savadkouei | 2026-03-23 17:00:27


VIEW MORE