Lobe Center Line help
09-28-2011, 04:52 PM
#1
Lobe Center Line help degreeing cam in car with a dial indicator and a degree wheel, the heads are off. i have a ls1 lifter that i converted to a solid lifter that i am using to degree. I found my intake lobe center line by using the .050" (from max lift) method... i got 70 + 158 divided by 2 = 114 ICL. i did the same thing for the exhaust lobe on the number one cylinder but it gives me some whacked out numbers like 209 and 67 (or 29 and 294 depending on which number you use on the wheel) which would make 209+67 divided by 2 = 138 ECL??? that would make a 126LSA hmmmmm that aint right!!! what am i doing wrong on finding my exhaust valve center line???
Last edited by 3rdCoastPowerSports; 09-28-2011 at 04:58 PM.
09-28-2011, 06:50 PM
#2
looks like i figured it out... i was going off numbers instead of degree's... looks like i got 68* and 152* divided by 2 =110 ECL....
so it looks like my cam is a 112LSA and has a ground in 2* retard.
Also i purchased this cam used from one of the guys on this forum, he sold it to me as a 233/239 .595/.603 @112LSA (even has a hand engraved 233/239 on the front of the cam) but when i degree it.... i get..... 238/236 .593/.598 @112LSA... i guess at least the LSA part was correct.... Reverse split cam with a 2* ground in retard, it was supposed to be a TSP233/239 i guess thats what i get for purchasing a slightly used cam with no cam card
so it looks like my cam is a 112LSA and has a ground in 2* retard.
Also i purchased this cam used from one of the guys on this forum, he sold it to me as a 233/239 .595/.603 @112LSA (even has a hand engraved 233/239 on the front of the cam) but when i degree it.... i get..... 238/236 .593/.598 @112LSA... i guess at least the LSA part was correct.... Reverse split cam with a 2* ground in retard, it was supposed to be a TSP233/239 i guess thats what i get for purchasing a slightly used cam with no cam card
09-28-2011, 07:12 PM
#3
If your measuring the lobe itself then how are you getting .593 and .598 lift numbers? Or did you already factor in the 1.7 rockers?
There is always tolerance in a camshaft hence using a cam doctor but those numbers seem a little too far out of the "norm"
There is always tolerance in a camshaft hence using a cam doctor but those numbers seem a little too far out of the "norm"
09-28-2011, 08:40 PM
#4
after looking at it and messen with it for long enough i got it all figured out and measured properly. A big problem i was having was seeing my small 9" degree wheel. i finally took pictures with my camera phone so i cold be alot more accurate in my reading of the wheel. looks like my cam is 234/236 (intake/exhaust @.050"), max intake lift .596" max exhaust lift .591", 112 Lsa, has 11* of overlap @ .050" and has a ground in 2* retard.
