higher duration?
In a nutshell, it keeps the valves open longer to fill or evacuate the cylinders better. There is a lot more to it, which you can find in the "stickies" at the top of the section.
Start with this CAM GUIDE for starters.
Start with this CAM GUIDE for starters.
Well that depends on what you define as beneficial, and yes both duration and LSA will determine the overlap thus sound that you will have. Basically more duration equals more of a rougher idle
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in general, the more duration you have(without changing lobe separation) will give you a lopier/chopier idle
you can counter act that a little bit by making the lobe separation angle wider....to an extent... there is a point where it will start to hurt power and torque
all of these things are better explained by valve events and overlap...
which is a completely more technical discussion, that I feel is probably not what needs to happen here...
but basically, Larger Durations usually mean more peak power with the sacrifice of low end torque
larger durations usually mean larger overlap, which means more lope
Lift and duration usually follow each other to some extent to keep a certain lobe profile which will be not too aggressive and not too slow to both make power and make it less traumatic on valve springs
to put it all in perspective
a 224 cam is usually under .600 lift and most versions have little or no overlap @.050
and it sounds reasonably tame and almost stock to some people
my personal cam is a 252/274 .646/.646 113+4 and I have 37* of overlap....
with total duration of 303/328 @.006
definitely not stock sounding....it sounds more like the apocalypse is happening....
you can counter act that a little bit by making the lobe separation angle wider....to an extent... there is a point where it will start to hurt power and torque
all of these things are better explained by valve events and overlap...
which is a completely more technical discussion, that I feel is probably not what needs to happen here...
but basically, Larger Durations usually mean more peak power with the sacrifice of low end torque
larger durations usually mean larger overlap, which means more lope
Lift and duration usually follow each other to some extent to keep a certain lobe profile which will be not too aggressive and not too slow to both make power and make it less traumatic on valve springs
to put it all in perspective
a 224 cam is usually under .600 lift and most versions have little or no overlap @.050
and it sounds reasonably tame and almost stock to some people
my personal cam is a 252/274 .646/.646 113+4 and I have 37* of overlap....
with total duration of 303/328 @.006
definitely not stock sounding....it sounds more like the apocalypse is happening....
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