Quote:
Originally Posted by SSLance
Greg, explain tighter and wider LSA please, remember...NOOB here.
The small cam in my engine now has a lobe separation of 109 and has zero lope to it.  I really don't care if it lopes at idle or not, I would prefer at least a bit of vacuum at idle as I'm still running power brakes. The cam in there now pulls 21" of vacuum at idle. |
EFFECTS OF CHANGING LOBE SEPERATION ANGLE (LSA)
Tighten (smaller LSA number)
Moves Torque to Lower RPM
Increases Maximum Torque
Narrow Power band
Builds Higher Cylinder Pressure
Increase Chance of Engine Knock
Increase Cranking Compression
Increase Effective Compression
Idle Vacuum is Reduced
Idle Quality Suffers
Open Valve-Overlap Increases
Closed Valve-Overlap Increases
Natural EGR Effect Increases
Decreases Piston-to-Valve Clearance
When you INCREASE the LSA the exact opposite effect will occur... so where a tight (example go from a 110* to a 114*) LSA says it will INCREASE - the wider LSA you can substitute DECREASE.... If the tighter LSA says DECREASE the WIDER LSA will INCREASE.