The Lobe
Separation Angle (LSA) is the distance between
the centerlines of the intake and exhaust lobes
on the camshaft. It is measured in degrees of
camshaft rotation.
¡¡
¡¡
¡¡
¡¡
How is it measured?
You can
calculate the LSA using the
centerlines of the intake and
exhaust lobes. (This information
should be listed on your Cam
Card. If not, you can find them
using a Dial Indicator and
Degree Wheel.)
The
formula for LSA is:
Intake Centerline + Exhaust
Centerline ¡Â 2
¡¡
For
example, if the intake is 107¡ã
and the exhaust is 117¡ã:
107¡ã +
117¡ã = 224¡ã
224¡ã ¡Â 2 =
112¡ã (LSA)
¡¡
¡¡
¡¡
¡¡
How does it affect
performance?
Combined
with Duration, the LSA
determines Valve Overlap. This
overlap has a significant impact
on Engine Vacuum and idle
quality.
¡¡
Camshafts
with a "tight" LSA (106¡ã - 109¡ã)
will usually have more overlap.
Camshafts with
a "wide" LSA (110¡ã - 118¡ã) will
have less overlap.
¡¡
¡¡
¡¡
Quick Links
Contact Info
Welcome to visit us
YuHuan
NewCams
Machinery
Manufacture Co.,Ltd.
We complete every process carefully and
provide the best service for
each vehicle.
