Question on Cams!!

[TrueSlide]

also would a race cam work good w/ a turbo? Im guessing here, a cam holds the valves open longer? or does it push the valves deeper into the cylinder to allow more air in?

And since it would allow more air in, and the fuel system supported it a outragous cam would work pretty good? Im kinda referring to the Nismo race cam that has like .550'/288deg &.563'/292deg, that would allow more air in and more fuel to be dumped which results in more power?

Hehe, they refer to cams by the lift right? So by the lift, Im guessing that the camshaft only pushes the valve deeper into the cylinder hence lift, which pushes the rocker arm higher and the valve lower? Am I right or wrong?

It wouldnt hold the valve open longer due to camshaft/valve timing or it might look something like this?

Thats what happens when your timing chain breaks and your valve taps a piston :ylsuper

Sorry for the chaotic post, my mind usually starts get going and it will sound alittle odd and confusing :thinker :thinker

[JNM240]

The Nismo race cam requires extensive modifications to your cylinder hear in order to work. The R4 street will 'drop' right in, but you will want to get their adjustable cam gear and advance the cam 4-6 degrees to start, until you get some kind of idle stabilizer, like my HKS Super AFR.

A cam is measured in two ways: lift and duration. The stock SOHC cam has a lift of .407", the R4 has a lift of .402", meaning it doesnt quite open as far. The stock SOHC cam has a duration (or how long the valve is opened) of 228 degrees. This is where the R4 street cam kicks its butt. It has a whopping 270 degree duration, meaning it is open for QUITE a bit longer.

I believe the R2 and R5 race cams are for full blown race engines only, i.e. ones that have been converted to carbs. These cams are way to wild for the ECU to be able to handle. As it is, the R4 (as 'mild' as it is) causes the ECU some headaces. The sudden imbalance of incoming air created by the overlap (due to the longer duration) cause the engine to stall quite a bit. The Super AFR buffers the incoming air flow signal from the MAS to the ECU, giving it more livable working conditions.

As for your question about cams and turbos, i would imagine the cam would help a lot, esp over a stock one. But im also sure you can get someone to custom grind a cam that would work the best with a bolt on turbo kit.

Good luck!