Like it says are they right for FI or do you need more of one or the other? I think you make more torque with a single pattern naturally aspirated for some reason just wondering if ti was the same in FI.

 

I am assuming you mean a centrifugal SC when you say "forced induction", since turbo cams are altogether different. In general, cams for cars with a centrifugal blower need more exhaust duration (and perhaps lift) than intake to allow for enough exhaust flow. The blower forces a lot of additional air (and fuel) into the motor, and it needs time to get out!

Most cams which work well on a car with a centrifugal blower and "typical" heads (with exhaust flow = 75-80% of the intake) have 10-14 degrees more exhaust than intake duration.

Rich Krause

 

Thanks man, what about turbo cams... I had no idea they were different.

 

It's a complex subject, and I am not very knowledgable about turbo cams. They have issues related to the need to keep exhaust velocity high and added exhaust restriction which in turn relate to the size and number of turbos. Many turbo cams have a "reverse split" with shorter exhaust than intake duration, to illustrate just how different they are.

Rich Krause

 

Wierd, well know anyone I can ask about them, Im buying a twin setup from turbolocity and was curious.