LSA Changes
Drifting
Joined: Jun 2005
Posts: 1,837
Likes: 4
Generally, a smaller LSA means a "peakier" cam - a narrower power band. Idle roughness is a function of the duration and the LSA. In fact, all of these numbers interact, its very hard to change just one and get a predictable result.
Intermediate
Joined: Nov 2005
Posts: 26
Likes: 0
From: Roswell NM
Instructor
Joined: Jan 2006
Posts: 178
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From: Dallas Texas
Having said that, LSA is not what you want to look at in choosing the valve events for a cam. Intake valve closing point, durations for the particular engine size and objective considering overlap, head flow at various lifts, the ratio between intake and exhaust flow are all much more important. LSA is just a number after getting these other events correct for your application.
Team Owner
Joined: Dec 2003
Posts: 21,840
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From: When all is said and done... there is a hell of a lot more said than done. Riverside,Texas
St. Jude Donor '05 thru '26
LSA is not what you want to look at in choosing the valve events for a cam. Intake valve closing point, durations for the particular engine size and objective considering overlap, head flow at various lifts, the ratio between intake and exhaust flow are all much more important. LSA is just a number after getting these other events correct for your application.
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Intermediate
Joined: Nov 2005
Posts: 26
Likes: 0
From: Roswell NM
Cam events
I'm not going to get into an argument here, but some of what gtovan says above is correct but tighter lsa gives more overlap which produces rough idle which hurts low end torque. It is true that less angle closes the intake sooner which will give more torque, if you were comparing to alike cams. This can get real technical and I could get into a real argument here but I won't. I have built hundreds of racing engines and degreed hundreds of cams. I have built my own flow bench and have done extensive testing on single cylinder race kart engines. The principles are the same in multi cylinder engines. To quote Smokey Yunick, "A larger separation angle generally produces more low-end torque and a loss of top end power."
Later, Ron
Later, Ron
Last edited by Speed7; Jan 13, 2007 at 01:43 PM. Reason: need to add to
