Sport Side

iTrader: (6)

Alright, if the ICL is 110 (+4), here is what I get

212/218 @ 114 + 4



.006 valve events
Intake Valve opens - IVO 22.5
Intake Valve closes - IVC 62.5
Exhaust Valve Opens - EVO 73.5
Exhaust Valve Closes - EVC 17.5
Exhaust Centerline - ECL 118
Overlap 40


.050 valve events
Intake Valve opens - IVO -4
Intake Valve closes - IVC39
Exhaust Valve Opens - EVO 47
Exhaust Valve Closes - EVC -9
Exhaust Centerline - ECL 118
Overlap -13

creederado

Cool,
I f*cked up reading my cam card

Sport Side

iTrader: (6)

Ohhhh,

Wow, your camshaft has 254* of intake duration @ .006?

Chart shows 265 @ .006

NVM! I see ya fixed it

I'll delete this post

Sport Side

iTrader: (6)

Yep, that formula should work.

I think I got 38* of overlap @ .006 for Ryan's 115lsa.

one03sierra

iTrader: (1)

well that is what i thought i was saying and people were saying that it was not true. guess i knew what i was asking and they did not.

Sport Side

iTrader: (6)

Sorry, what were you asking?

Ryan23silverado

iTrader: (1)

In theory, yes you could run a 112 lsa and have a very small overlap. However, as in that picture you will see that the lobes are much smaller to achieve this result. If you are really trying to open the valves and get some air in the cylinder you would need larger lobes. Then if you still wanted to keep a low overlap with large lobes, you can picture that, yes, the lsa would have to increase to lower the overlap for big lobes.
So, yes lsa is a decent indicator for overlap...I didn't mean to nail anyone on this, but I just wanted to let people know that there IS more to it than just picking a "good blower cam" because it has a high lsa number. ***I made this $350 mistake by picking a high lsa cam that in actuality has a fair amount of overlap thinking it was a good blower cam based solely on the lsa. I didn't want others to make a poor choice in cams.

Overlap plays a large part in cams. And too many people when talking about lsa (although it is a fair indicator) [directly] equate it with how much overlap a camshaft has.


-SportSide 5.3 has a very good hang on this stuff. Thanks for posting up man you helped me learn too. Thanks!

one03sierra

iTrader: (1)

ok now i think i am beginning to understand. i was thinking you meant that no it didnt. cool. man i have been reading all i can about cams. now that i have been reading more they are talking about piston speed and ****. talk about even more confusion.