110 lsa
Instructor
Joined: Sep 2015
Posts: 167
Likes: 33
From: TN
completely dependent on duration.
you could have a small duration cam with 110 LSA that has good street manners, and a large duration cam with 110 LSA that can barely idle and sucks to drive on the street.
if you have duration and LSA, then calculate EVO, EVC, IVO, IVC. the relation between EVC and IVO is called "overlap" that determines idle quality.
Also "vacuum" won't tell you anything since someone can set their "idle" at 1400 rpm and have plenty of vacuum but the car still has poor street manners, while someone at 700 rpm idle has less vacuum but the car has very nice street manners.
Exaggerating the example here but you get the idea.
what you should have asked is "What amount of overlap is in your cam, and how is drive-ability" and you will get a very wide range of answers because what is a "very good street cam" to one individual , is a "this cam sucks for the street" to another individual.
you could have a small duration cam with 110 LSA that has good street manners, and a large duration cam with 110 LSA that can barely idle and sucks to drive on the street.
if you have duration and LSA, then calculate EVO, EVC, IVO, IVC. the relation between EVC and IVO is called "overlap" that determines idle quality.
Also "vacuum" won't tell you anything since someone can set their "idle" at 1400 rpm and have plenty of vacuum but the car still has poor street manners, while someone at 700 rpm idle has less vacuum but the car has very nice street manners.
Exaggerating the example here but you get the idea.
what you should have asked is "What amount of overlap is in your cam, and how is drive-ability" and you will get a very wide range of answers because what is a "very good street cam" to one individual , is a "this cam sucks for the street" to another individual.
Racer
Joined: Jan 2015
Posts: 375
Likes: 31
From: San Antonio TX
As stated, the LSA is much less important than the duration and overlap.
KW
Last edited by KW Baraka; Aug 2, 2019 at 11:39 PM.
