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,
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.
July 25, 2021, 11:54 AM
Mike Rietow
What that's saying is, is the lobe sep is 109.
The 105 is telling you they put 4 degrees advance in it.
So you put it in straight up, if it degrees 105 intake centerline, you're good. If it don't, you move / adjust it to 105 intake center line.
July 25, 2021, 02:48 PM
B.C.Malibu
Usually it says installed lobe centerline. Post a pic of the card
July 25, 2021, 03:00 PM
Novacaine
I cant a pic of it for some reason.
July 25, 2021, 03:03 PM
Bad News
quote:
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.
July 25, 2021, 03:09 PM
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.
July 25, 2021, 07:25 PM
Big Steve
Well it's just a guess but I think you did something very wrong....
July 26, 2021, 05:26 AM
Bad News
quote:
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.
July 26, 2021, 07:03 AM
TD1964
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.
July 26, 2021, 08:07 AM
Novacaine
I used a degree wheel and used TDC. maybe I have something else going on. I will check it out.
July 26, 2021, 10:31 AM
FootbrakeJim
quote:
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!!
July 26, 2021, 10:50 AM
Mike Rietow
quote:
Originally posted by Novacaine: I used a degree wheel and used TDC. maybe I have something else going on. I will check it out.
Verify TDC, I've used the balancer as a degree wheel in the past, when I've gotten myself in an awkward position.
