I need new valve springs for my JDM ITR camshafts.

The portflow stiffened inner valve springs are only 80 dollars while the JDM ITR ones are 100. Which one should i get? I've heard that the portflow ones are too stiff and that i wouldn't gain as much power.

 

err diffenatlly portflow.

 

ITR outers and Portflow inners are a proven combination. Go with them.

 

sorry this is a stupid question, but what do they mean by outer and inner? And by saying that i'm going to move my gsr intake springs to the exhaust side...is that dealing with the inner or outer springs?

 

Just to clarify, there is no valve spring combination that will make you gain horsepower over another. The only difference is the way it facilitates different cam profiles and tolerance to improved RPM capability.

Only go as stiff as you need to because its puts more strain on your cam lobes and bearings. But yeah, I agree, get the portflow springs..

 

stiffer springs=less cam life because you have more powerful springs pushing on the metal
softer springs=cant rev as high
if u want to rev to 10, get portflow inners... but if ur reving to 10, i expect you to have new cams, like todas....
be realistic w/ urself, no point of reving to 10 unless u got cams that make power
springs dont change horsepower as stated above.
get the portflows save urself 20 bux and have the possibilty to rev to 10k later

 

10k? Like ten thousand RPM?! That kind of RPM is possible for a Honda motor, no doubt. But making good power that high would be pretty tricky IMO. VTEC valve train seems pretty heavy to handle such a duty. Not to mention, that's no easy task to accomplish with 92 octane fuel regardless. Then you have the reliability and gearing issue...


Personally, for a flatter torque curve and longer lasting motor making similar HP with fewer revs- I'd use the b20 block as a starting point.

 

I highly suggest you go with the portflow inners and the ITR outers. That's what I'm running on my Crower 63402 and CTR piston setup. They've saved my *** before on a nasty over rev (gotta love the skunk2 p28 no rev limit argh). So what if you don't make power up that high, it's the peace of mind knowing that if you misshift or over rev, there is a greater chance that you won't blow your motor. I'd also recommend getting portflows titanium retainers as well, the stockers just flatout suck. HTH

 

go with the portflow....i bought a set from inlinefour.com for $60