Posted: Mon May 05, 2008 7:39 pm
you wont increase the lag by increasing the lift??? 
if you just change lift and not duration - you will get more air into the engine at the same timing as before. this means you will get more bang (and thus more torque) without changing characteristics. if you increase the duration slightly you will get better breathing (specially at the top end).
a mild increase with a lot of lift is best for turbo cars.
N/A cars need long durations like 300 so that at the top end of the revs they can breath well enough to make power - but this is at a detriment to the lower end of the rev range because of the overlap. so overlap is not bad either. it all depends on what you want to achieve!
anyway - engineers will increase the lift of the cam by welding up the lobes with a specialised welding process, and then regrinding the lobe to the desired duration and lift!
if you just change lift and not duration - you will get more air into the engine at the same timing as before. this means you will get more bang (and thus more torque) without changing characteristics. if you increase the duration slightly you will get better breathing (specially at the top end).
a mild increase with a lot of lift is best for turbo cars.
N/A cars need long durations like 300 so that at the top end of the revs they can breath well enough to make power - but this is at a detriment to the lower end of the rev range because of the overlap. so overlap is not bad either. it all depends on what you want to achieve!
anyway - engineers will increase the lift of the cam by welding up the lobes with a specialised welding process, and then regrinding the lobe to the desired duration and lift!
![[smilie=200sx_200sx.gif]](./images/smilies/200SX_200SX.gif "200SX_200SX")