Hello,

sorry, another cam thread ! but I read all the threads and haven't found what I'm looking for...

How the duration comes into the game with LC and overlap ?

I mean 110i/110e on 264/264 cams gives a certain angle of overlap... but the same Lobe Centers on 272/272 give a bigger overlap !

So, do we have to retard intake/advance the exhaust a bit when changing to bigger duration cams to mantain the same overlap, once one found an overlap setup reversion safe and with a good spool up ?

For example...

now I'm running 264/264 110i/110e:
if I ipothetically will change to 272/264 to retard a bit the intake valve closing and trying to find some more hp on top, will I have to retard intake LC to have the same overlap I have now, that is to say from 110i to 114i ?


TIA.

Bye...

 

Is this with HKS cams?

 

Hi sparky,

it's not with hks cams... by the way these are general concepts, valid for every brand of cams...

 

Correct.


Reducing overlap involves retarding the intake and/or advancing the exhaust. This may or may not be of benefit.

 

Ok... thank you Ted...

Bye.