PerformanceTrucks.net Forums

GM Engine & Exhaust Performance EFI | GEN I/GEN II/GEN III/GEN IV Engines |Small Block | Big Block |

Blower Cams and Overlap

Thread Tools
 
Search this Thread
 
Old Mar 22, 2005 | 03:04 PM
  #1  
moregrip's Avatar
moregrip
Thread Starter
what a rush!
20 Year Member
Loved
Liked
Community Favorite
iTrader: (8)
 
Joined: Feb 2004
Posts: 17,629
Likes: 33
From: Wyoming
Default Blower Cams and Overlap
How many degrees of overlap is typical on a blower Cam? I'm talking general here folks.
Reply
0
Old Mar 22, 2005 | 05:05 PM
  #2  
Mr. Sandog's Avatar
Mr. Sandog
TECH Veteran
 
Joined: Mar 2004
Posts: 4,632
Likes: 2
From: Sun Diego
Default
0*, or less (negative).
Reply
0
Old Mar 22, 2005 | 05:54 PM
  #3  
whitt1
TECH Junkie
 
Joined: Mar 2002
Posts: 3,019
Likes: 1
From: memphis tn
Default
Mine is 228/234 .588/.598 115LS +4 and has 0 degrees of overlap.
Reply
0
Old Mar 22, 2005 | 06:31 PM
  #4  
moregrip's Avatar
moregrip
Thread Starter
what a rush!
20 Year Member
Loved
Liked
Community Favorite
iTrader: (8)
 
Joined: Feb 2004
Posts: 17,629
Likes: 33
From: Wyoming
Default
Originally Posted by whitt1
Mine is 228/234 .588/.598 115LS +4 and has 0 degrees of overlap.
what are the valve events for this cam @ .006?

Naked, what are yours @ .006?
Reply
0
Old Mar 22, 2005 | 06:37 PM
  #5  
BigTex's Avatar
BigTex
? ? ? ? ? ?
iTrader: (16)
 
Joined: Nov 2001
Posts: 7,126
Likes: 2
From: East of Dallas
Default
Hmmmm, I calculate that as 1* of overlap at .050. Of course you do have lots of overlap below .050 lift.
Reply
0
Old Mar 22, 2005 | 06:38 PM
  #6  
whitt1
TECH Junkie
 
Joined: Mar 2002
Posts: 3,019
Likes: 1
From: memphis tn
Default
Originally Posted by moregrip
what are the valve events for this cam @ .006?

Naked, what are yours @ .006?
273/283 but I'm running 1.75 rockerarms so the lift is .605/.615.
Reply
0
Old Mar 22, 2005 | 06:39 PM
  #7  
Sport Side's Avatar
Sport Side
TECH Veteran
iTrader: (6)
 
Joined: Nov 2003
Posts: 4,397
Likes: 0
From: Tallahassee, FL
Default
228*-234*
x-er

Intake Valve opens - IVO 27.5
Intake Valve closes - IVC 69.5
Exhaust Valve Opens - EVO 80.5
Exhaust Valve Closes - EVC 22.5
Exhaust Centerline - ECL 119
Overlap 50


- ivo = atdc
- evc = btdc
Reply
0

Trending Topics

Old Mar 22, 2005 | 06:40 PM
  #8  
whitt1
TECH Junkie
 
Joined: Mar 2002
Posts: 3,019
Likes: 1
From: memphis tn
Default
Originally Posted by BigTex
Hmmmm, I calculate that as 1* of overlap at .050. Of course you do have lots of overlap below .050 lift.
How are you calculating overlap without advertised duration?
Reply
0
Old Mar 22, 2005 | 06:41 PM
  #9  
moregrip's Avatar
moregrip
Thread Starter
what a rush!
20 Year Member
Loved
Liked
Community Favorite
iTrader: (8)
 
Joined: Feb 2004
Posts: 17,629
Likes: 33
From: Wyoming
Default
Originally Posted by SportSide 5.3
228*-234*
x-er

Intake Valve opens - IVO -36.5
Intake Valve closes - IVC 5.5
Exhaust Valve Opens - EVO 16.5
Exhaust Valve Closes - EVC -41.5
Exhaust Centerline - ECL 119
Overlap -78

- ivo = atdc
- evc = btdc

something like this:

Overlap: 78.00 degrees
Intake Duration: 222.00 degrees
Exhaust Duration: 238.00 degrees
Intake Installed Centerline of 74.50 degrees ATDC.
Exhaust Installed Centerline of 77.50 degrees BTDC.
Reply
0
Old Mar 22, 2005 | 06:44 PM
  #10  
Sport Side's Avatar
Sport Side
TECH Veteran
iTrader: (6)
 
Joined: Nov 2003
Posts: 4,397
Likes: 0
From: Tallahassee, FL
Default
lol

my calculator is all f'ed up.
Reply
0



Advanced Search

All times are GMT -5. The time now is 08:55 PM.