Editing How to choose a camshaft (section)
Jump to:
navigation
,
search
===Intake centerline (ICL)=== This number represents where the intake lobe's peak lift occurs in relation to crankshaft rotation. It is the point of maximum lift of the intake lobe and is measured in ''crankshaft'' degrees. A cam ground "straight up" means that the exhaust lobe's peak lift will happen at the same amount of degrees before top dead center, as the intake valve will peak after top dead center if the intake and exhaust durations are the same. ICL is machined into the cam. When cam manufacturers machine the snout of the cam for the cam sprocket, they will drill the holes with the cam slightly advanced, retarded, or straight up. When installed with stock components, the ICL can't be altered. Aftermarket timing set gears often have provisions for altering the cam timing by advancing or retarding the cam position in relationship to the crankshaft position. If the cam card shows the LSA is the same as ICL, the cam is said to be ground "straight up." If the ICL is ''less'' than the LSA, it is said to be ground "advanced". If ICL is more than the LSA, the cam is said to be ground "retarded". It is much more common to see a cam ground advanced or straight up than retarded. Example: If the cam has a 110 degree LSA with a 106 ICL, the cam is ''advanced'' by 4 degrees. More on this under "Phasing the camshaft", below.
|
Editing help
(opens in new window)
Personal tools
Log in / create account
Namespaces
Page
Discussion
Variants
Views
Read
Edit
View history
Actions
Search
Navigation
Main Page
Recent changes
Random page
Help
All articles
Start a new article
Hotrodders forum
Categories
Best articles
Body and exterior
Brakes
Cooling
Electrical
Engine
Fasteners
Frame
Garage and shop
General hotrodding
Identification and decoding
Interior
Rearend
Safety
Steering
Suspension
Tires
Tools
Transmission
Troubleshooting
Wheels
Toolbox
What links here
Related changes
Special pages
Terms of Use
Copyright
Privacy Policy
Your Privacy Choices
Manage Consent