Camshaft LSA
Camshaft LSA Im trying to understand this camshaft LSA thing. which LSA provides the best torque curve and has the best driveability? what is the comparability in idle lopes within each LSA, such as which LSA is similar to stock idle and which LSA is similar to the the gulping (choppy) lope?
what does the + mean? for example some cams are 224/228 114+1 LSA.
what does the + mean? for example some cams are 224/228 114+1 LSA.
Last edited by c5_ls1_6spd; Apr 5, 2006 at 04:29 PM.
I can semi-answer this. As I understood it, a lower number, such as 112 gives you more power down low and you won't have to rev the motor quite as high, but it gives you more lope and generally more sloppy street manners. The +1 etc are advance that is ground into the cam.
Anyone can correct me as I am semi-guessing.
Anyone can correct me as I am semi-guessing.
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The higher the LSA the better idle characterictic of the cam, easier to tune, morr power at higher RPM. A tighter LSA is the total opposite.
Ideally, if you have a good performance cam, and heads, you may want to go 112LSA on a natural aspired application. On a FI application, you want 114-116LSA
HTH
Goose
Ideally, if you have a good performance cam, and heads, you may want to go 112LSA on a natural aspired application. On a FI application, you want 114-116LSA
HTH
Goose
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From: CT
Originally Posted by Wicked LT1
The higher the LSA the better idle characterictic of the cam, easier to tune, morr power at higher RPM. A tighter LSA is the total opposite.
Ideally, if you have a good performance cam, and heads, you may want to go 112LSA on a natural aspired application. On a FI application, you want 114-116LSA
HTH
Goose
Ideally, if you have a good performance cam, and heads, you may want to go 112LSA on a natural aspired application. On a FI application, you want 114-116LSA
HTH
Goose
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Joined: Mar 2003
Posts: 1,946
Likes: 1
Actually it is NOT lsa that gives the lopey shakey idle..... Example... My new 226/230 112lsa cam has less lope then my old 232/236 114lsa cam. Is has to do with the overlap. My old cam had 55/6 degrees overlap and my new cam has 53/4, @ .006/.050 lift...
The +1 means the intake center line (ICL) is ground 1 degree advance. If the lsa is 112 and it has 1 degree of advance the ICL would be 111...
The more time both valves stay open (overlap) the greater the lope or shake... not a specific lsa.
As far as power goes.... Street driven 346 LS1s "like" an intake valve closing (IVC) between 43-46 degrees @ .050 and an IVO and EVC at equal distances from TDC... Anything later turns into a high reving qtr mile application. Anything sooner tends to kill off top end power but gives strong pulling in the low to mid RPM range... Also, having an early IVC builds more cylinder pressure and makes for better low-rpm driving...
The +1 means the intake center line (ICL) is ground 1 degree advance. If the lsa is 112 and it has 1 degree of advance the ICL would be 111...
The more time both valves stay open (overlap) the greater the lope or shake... not a specific lsa.
As far as power goes.... Street driven 346 LS1s "like" an intake valve closing (IVC) between 43-46 degrees @ .050 and an IVO and EVC at equal distances from TDC... Anything later turns into a high reving qtr mile application. Anything sooner tends to kill off top end power but gives strong pulling in the low to mid RPM range... Also, having an early IVC builds more cylinder pressure and makes for better low-rpm driving...
Last edited by SideStep; Apr 5, 2006 at 11:55 PM.
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From: Maypearl, TX
Originally Posted by SideStep
Actually it is NOT lsa that gives the lopey shakey idle..... Example... My new 226/230 112lsa cam has less lope then my old 232/236 114lsa cam. Is has to do with the overlap. My old cam had 55/6 degrees overlap and my new cam has 53/4, @ .006/.050 lift...
The +1 means the intake center line (ICL) is ground 1 degree advance. If the lsa is 112 and it has 1 degree of advance the ICL would be 111...
The more time both valves stay open (overlap) the greater the lope or shake... not a specific lsa.
As far as power goes.... Street driven 346 LS1s "like" an intake valve closing (IVC) between 43-46 degrees @ .050 and an IVO and EVC at equal distances from TDC... Anything later turns into a high reving qtr mile application. Anything sooner tends to kill off top end power but gives strong pulling in the low to mid RPM range... Also, having an early IVC builds more cylinder pressure and makes for better low-rpm driving...
The +1 means the intake center line (ICL) is ground 1 degree advance. If the lsa is 112 and it has 1 degree of advance the ICL would be 111...
The more time both valves stay open (overlap) the greater the lope or shake... not a specific lsa.
As far as power goes.... Street driven 346 LS1s "like" an intake valve closing (IVC) between 43-46 degrees @ .050 and an IVO and EVC at equal distances from TDC... Anything later turns into a high reving qtr mile application. Anything sooner tends to kill off top end power but gives strong pulling in the low to mid RPM range... Also, having an early IVC builds more cylinder pressure and makes for better low-rpm driving...
Soooo, if I wanted a good NA cam for my Z06, then would your cam be the one to get?
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