Quote:
Originally Posted by retrofit1
sifu sky,i'm using 4g13p...satria mmc batch.i plan to install hicam to increase torque.what duration do you suggest? do i have to change the valve spring as well.how much ar?  |
the normal one, 272 degree would be suitable... reasonable power increase but with minimal (not none) effect on low end and driveability... get it tuned properly and it will perform...
as for valve spring... i'm heard some sifoo using standard valve spring on 292 cams no problem... while the other sifoo using 272 cams on standard valve spring KO'ed....
so, i guess it fairly depends on the condition of ur valve springs... if ur duration and lift of ur highcam is alot and often high revs, it is recommended to upgrade to stiffer valve springs...
my 2 cents...
