If you was to have a cam card saying LS 109 CL IN EX 105 113 Does that mean its a 113 LS with 4 degrees cut in to it to make 109?This message has been edited. Last edited by: Novacaine,
Posts: 217 | Location: North Carolina | Registered: May 07, 2003
Originally posted by B.C.Malibu: LS= lobe separation the distance measured in degrees how far the intake lobe centerline and exhaust lobe centerline are from one another.
Posts: 697 | Location: Bucks Co Pa | Registered: January 23, 2003
Originally posted by Novacaine: If you was to have a cam card saying LS 109 CL IN EX 105 113 Does that mean its a 113 LS with 4 degrees cut in to it to make 109?
109 lobe separation ground into cam Intake centerline is 105 Exhaust centerline is 113 Install cam at 105 intake centerline to be 4 degrees advanced
109 installed Intake centerline would be "straight up"
People get lobe seperation (LS) confused with Intake centerline (ICL) and dot to dot they call straight up.
Posts: 868 | Location: ft laud | Registered: September 02, 2004
I have a 555 and set it up at 109. dot to dot. I ran it about 6 races and it ran from 5.74 to 5.88. After checking I had the wrong valve springs. I pulled the engine out, checked everything. Had the new springs put in and set up and cleaned the head surface. I put it back together and advance it 4 degrees to 105 and ran it yesterday. It was a turd wouldn't run good at all, ran 6.70. All I did was advanced the cam.
Posts: 217 | Location: North Carolina | Registered: May 07, 2003
Originally posted by Novacaine: I have a 555 and set it up at 109. dot to dot. I ran it about 6 races and it ran from 5.74 to 5.88. After checking I had the wrong valve springs. I pulled the engine out, checked everything. Had the new springs put in and set up and cleaned the head surface. I put it back together and advance it 4 degrees to 105 and ran it yesterday. It was a turd wouldn't run good at all, ran 6.70. All I did was advanced the cam.
Are you actually using an indicator and degree wheel or just going off of the advance keyways on the timing set? You should have degreed this when the heads were off, you could have actually verified TDC. If you are just using the marks, it will never work accurately.
Posts: 868 | Location: ft laud | Registered: September 02, 2004
Are you actually using an indicator and degree wheel or just going off of the advance keyways on the timing set? You should have degreed this when the heads were off, you could have actually verified TDC. If you are just using the marks, it will never work accurately.[/QUOTE]
Good news is he can still use a piston stop to locate TDC. Lets hope he gets this figured out. That being said, it sure is easier when the heads off.
Posts: 97 | Location: Atlanta “Land Soft--Kill Quiet” | Registered: January 21, 2021
Originally posted by TD1964: Good news is he can still use a piston stop to locate TDC. Lets hope he gets this figured out.
^^^ Do this. Because TDC indicators are inaccurate way more often than most people think. If you don't have a piston stop, you can easily make one out of a spark plug and a small piece of some 1/8" welding rod. Also, double check ignition timing, float levels, fuel pressure, & valve lash.
Dan "Jim" Moore Much too young to feel this damn old!!
