[black4x4]

lift equels how far the valves are opend in thousandths of an inch

duration is how long the valve stays open such as if the cam has 212 degres of deration the valve will be open 212 degrees of the possible 360

valve overlap is how many degrees of rotation both valves are open on the 360 degree rotation.

 

[Hit Man X]

Don't forget you have two reading of duration... adv and @ .050.

The Adv will help decide on how well the cam idles and what sort of power it will make.

2¢

 

[brodystruck]

The LSA will play a big role in idle quality. The lower the LSA the lower the idle quality (which can be a cool thing eheh).

 

[Hit Man X]

LSA isn't only about idle, it also helps with idle vac too as well as midrange punch. Tighter LSA's also make the powerband less "peaky" AND a tight LSA isn't good for FI/Nitrous as you could actually blow it out the exhaust...

I've seen quite a few 204/211 .460/.480 110LSA cam's that idle fine...the seat-to-seat duration or advertised plays a large role also. It deals with the ramp rates of the lobes at .006" lift. Lower Adv is a faster lobe making a cleaner idle.

 

[geauxlow]

lift equels how far the valves are opend in thousandths of an inch

duration is how long the valve stays open such as if the cam has 212 degres of deration the valve will be open 212 degrees of the possible 360

valve overlap is how many degrees of rotation both valves are open on the 360 degree rotation.

I believe every time the crank rotates the cam rotates twice. So there should be a total of 720 degrees on a cam. Does this make any sense? :think:

 

[brodystruck]

LSA isn't only about idle, it also helps with idle vac too as well as midrange punch. Tighter LSA's also make the powerband less "peaky" AND a tight LSA isn't good for FI/Nitrous as you could actually blow it out the exhaust...

I've seen quite a few 204/211 .460/.480 110LSA cam's that idle fine...the seat-to-seat duration or advertised plays a large role also. It deals with the ramp rates of the lobes at .006" lift. Lower Adv is a faster lobe making a cleaner idle.

:word:

I believe every time the crank rotates the cam rotates twice. So there should be a total of 720 degrees on a cam. Does this make any sense? :think:

I think the crankshaft spins one time for every half turn, but im not sure its been a while lol...

 

[black4x4]

yeah i messed up on how many dagrees the cam roatated.