From my understanding.. high lift cams for a NA car has the potential to produce more power in the high end, and that's why NA car with higher compression ratio can benefit from it.

can someone explain how does a turbo car benefit from turbo cams? how does turbo cam works better than stock besides the fact that it's stronger?

Thanks!!

 

i think it mainly has something to do with the timing. they call it over lap. dont know what it means but they say you dont want over lap with a turbo cam.

 

Who said this?

 

on this forum

 

Overlap is when the intake and exhaust valves are open at the same time. N/A cams have more overlap, and it promotes good flow in those applications, but you don't want overlap in a boost application since the boost will essentially blow right thru the combustion chamber and out the engine.

 

Inspyral has got it, thats why many people get adjustable cam gears to dial out the cam overlap. From what my tuner told me you can gain around 20-30hp from doing this.

 

but if you dial it out you change your timing. right?

 

dont turbo cams increase duration? Correct me if Im wrong, but it lets the intake valve stay open longer so more air can be forced in? This was my understanding but dont take my word.

 

i thought that turbo cams increased lift. hmm im prolly wrong but i thought i read somewhere too much duration was bad i forgot why it said that because it was a long time ago but still im prolly wrong still a n00b

 

I am sure turbo cams increase duration, decrease overlap, and maybe increase lift a little.

 

Not and expert but too much duration means the valve is open longer, well that cant be good when a piston is moving up in the combustion chamber. piston hitting valve not good!!

 

wait so i was right? right?

 

So is this how it goes?

Duration = time when both (or all 4) valves closed
Overlap = time when both valves are open

if thats it then a turbo cam would minimize the valve overlap, so the pressurized mixture wouldnt go out the exhaust port...

 

if i am right you are right. you follow me!!

*again i am not an expert

 

duration= how long the valve is open. other than that your are right.

 

4 stroke cycle... no valve is open during the compression stroke... even w/ an aggressive, counterproductive amount of duration. pistons will be domed or have cuts so that open valves still have clearance w/ tdc piston. of course this differs w/ every application (mitsu 1.8 na engine have flat piston heads for example). it is possible to do everything an engine is not supposed to do so don't try to apply dumbass situations

 

From what I understand optimal turbo cams will:

Have low duration and high lift.
Have minimal overlap.
Wont idle too good.
Require springs and retainers.
Only really benefit if head is P&P.
Produce good amount of horsepower.
Sound bad ***.

 

not if you are reving high and your valves are close to floating or are already floating.

 

a good example of a mildly dumbass situation. Try having a valvetrain that can keep up w/ the current system before looking into mad tizzite turbo cams.

 

I have tried nearly every cam on the market for my Ls and all seem to be far better than stock its just where you want the power. Right now i have the Crower 62404 cams in and they make good power its jsut way high in the power band. I can make peak power at over 9K. I am trying to get ahold of the 62402T cams but Crower is being cooperative and giving me a release of when they will have them. They say they are out of cores but they wont tell me if anyone else would have them, like Race Engineering. Basically a good turbo cam will just have a retarded intake cam. For an in depth article on turbo and cams check out the August 2001 article on the 2.3 SVO mustang in Mustangs and Fast Fords Magazine. Its a very good article (probably a first for that magazine)

 

And where would one go to obtain a copy of said publication?