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

lsa and cam?

Thread Tools
 
Search this Thread
 
Old Apr 17, 2007 | 06:35 AM
  #1  
nathancalifornia's Avatar
Thread Starter
Teching In
 
Joined: Jun 2006
Posts: 24
Likes: 0
From: military so i live in hawaii, born and raised in Tennessee
Default lsa and cam?

from my understanding, the lower the lsa in a cam, the lower the powerband is on a cam. and the higher lsa, the power band will be higher. is this correct or is it the other way around. ?
Reply
Old Apr 17, 2007 | 08:21 AM
  #2  
BLACK04VHO's Avatar
Launching!
iTrader: (2)
 
Joined: May 2006
Posts: 289
Likes: 0
Default

basically yes, but theirs alot more to it then this. Duration is a big factor for when the power band kicks in also. Don't go below a 112 though in LSA.
Reply
Old Apr 17, 2007 | 08:58 AM
  #3  
silver-mod-o's Avatar
Hunt&Fisherator
iTrader: (15)
 
Joined: Nov 2005
Posts: 14,314
Likes: 17
From: SETx
Default

the tighter the LSA (lower number) the higher up the power will want to come on... this is definitely relative though... it has a lot to do with you ci displacement, exhaust setup, tune, etc etc... much more goes into figuring out your specific power besides just cam numbers.
Reply
Old Apr 17, 2007 | 09:40 AM
  #4  
99/5.3w/hips's Avatar
TECH Regular
iTrader: (8)
 
Joined: Feb 2006
Posts: 464
Likes: 0
From: CA
Default

Originally Posted by BLACK04VHO
basically yes, but theirs alot more to it then this. Duration is a big factor for when the power band kicks in also. Don't go below a 112 though in LSA.
why would you not go below 112 lsa? there are so many reasons TO go under 112 lsa
Reply
Old Apr 17, 2007 | 10:04 AM
  #5  
yurs78's Avatar
TECH Apprentice
 
Joined: Nov 2006
Posts: 335
Likes: 0
From: Juda
Default

Originally Posted by silver-mod-o
the tighter the LSA (lower number) the higher up the power will want to come on... this is definitely relative though... it has a lot to do with you ci displacement, exhaust setup, tune, etc etc... much more goes into figuring out your specific power besides just cam numbers.
What do you mean "the higer up the power will want to come on..."? Two identical cams, the only difference being the lsa there will be a big difference. If one is a 110 and the other is a 117 the 110 will have a peak hp about 400 rpms lower. The TQ peak will also be lower in the rpm and it will have more peak tq and average tq through out the rpms
This is just one instance, it doesn't mean these exact changes are a universal constant but I'm pretty sure in some cases similar results can happen.
This link helped me a lot:
http://www.hotrod.com/techarticles/1...ild/index.html
Reply
Old Apr 17, 2007 | 01:54 PM
  #6  
Silver-Dollar's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Jul 2004
Posts: 1,155
Likes: 0
From: Summerville, SC
Default

99 - Have you dynoed yet to see your rpm range? what do you have your wot shift points set to? do you have any advanced ground in the 110 or is it straight up?
Reply
Old Apr 17, 2007 | 02:10 PM
  #7  
99/5.3w/hips's Avatar
TECH Regular
iTrader: (8)
 
Joined: Feb 2006
Posts: 464
Likes: 0
From: CA
Default

Originally Posted by Silver-Dollar
99 - Have you dynoed yet to see your rpm range? what do you have your wot shift points set to? do you have any advanced ground in the 110 or is it straight up?
havent dynoed yet, shift points are at 1-2 6k and 2-3 5800 right now, it's cam only right now so no need to go higher. It has a 4* advance in it so its technically a 110 lsa 106 icl. I like the advance right now but when I fine tune it better with the rest of the bolt ons I might change the timing set and get an adjustable one and take out the advance. Right now I am driving with no convertor and its completely streetable, pulls HARD above 3200 all the way up to my shift points right now.
Reply
Old Apr 17, 2007 | 02:16 PM
  #8  
Sport Side's Avatar
TECH Veteran
iTrader: (6)
 
Joined: Nov 2003
Posts: 4,397
Likes: 0
From: Tallahassee, FL
Default

LSA is meaningless without duration. One given LSA paired up with your intake/exhaust lobes will make the most average power in a given power range. Tight/Wide... Don't bother even thinking about it.
Reply
Old Apr 17, 2007 | 02:33 PM
  #9  
99/5.3w/hips's Avatar
TECH Regular
iTrader: (8)
 
Joined: Feb 2006
Posts: 464
Likes: 0
From: CA
Default

Originally Posted by Sport Side
LSA is meaningless without duration. One given LSA paired up with your intake/exhaust lobes will make the most average power in a given power range. Tight/Wide... Don't bother even thinking about it.
word dont focus too much on lsa
Reply
Old Apr 18, 2007 | 08:27 AM
  #10  
Silver-Dollar's Avatar
TECH Fanatic
iTrader: (1)
 
Joined: Jul 2004
Posts: 1,155
Likes: 0
From: Summerville, SC
Default

Say you had a cam that spec'ed out at 220/220 .581/.581 112+4. And you had a 224/224 .581/.581 cut down on a LSA that match the peak rpm of the 220/220 cam. Would the custom 224 make more peak power? How would the 2600 to 3600 rpms compare?
Reply



All times are GMT -5. The time now is 06:58 AM.