Hi guys.

I installed ITR intake cam on my B16.

now I have to tune.. I am intending to increase rpm range.
can I increase in 2 hundred rpm without risks or I must change valve springs?
on the exhaust side I still have the oem cam.

my inquiry is because I want to save some money.

cause if I must change springs I will take oportunity to increase compression with a cometic gasket.

but my initial intend is to increase rpm range without changing springs or is it too risky?

 

You CAN do anything you choose. You SHOULD change the springs if raising the rev limiter. You don't need to pull the head to change the springs either.

 

the ITR cam is REALLY a mild cam when compared to the other Stage 1 cams available on the market. i tried them (i had the CTRs) in my B16A twice. i actually sold mine because although my mid range increased dramatically, my top end actually went down compared to the stock Gen II JDM cams, no matter how i tuned them. i have no idea why. maybe they will work for you though.

what intake manifold do you have? the stock B16A manifold was only designed to produce power to the 7800-8000 RPM range. it dies off VERY QUICKLY after that.

do you have a JDM Gen II B16A?

B16As dont like long tube headers. they also prefer the 4-1 configuration or a very short primary Tri-Y header as well.


i dont know what bolt-ons you already have but try this setup
**** if you have the Gen II B16A, install the ITR exhaust cam and reinstall the B16A intake cam****get another intake manifold (AEBS or Skunk2) and a 68mm TB****a 4-1 header****retard both cams -2 degrees****

your stock springs (if you have the Gen II) are fine for these cams up to 9000 RPM. dont go ANY higher than that. 200 RPM is not considered an increase.

you will have to increase breathing efficiency to successfully make high RPM power on the B16A. these suggestions will do just that.

P.S. i would get the two layer head gasket no matter what!!!

 

To the best of my knowledge, you would NOT want to rev stock B16 valvetrain past the preset rev limiter. Especially with a higher lift, longer duration cam. You run the risk of floating the valves. Why did Honda put lighter intake valves and increase the spring rates to only increase the rev limiter 400rpms? There is a reason behind this logic, stick to it. Not what somone on the internet tells you. I don't care if joe blow has been revving his stock B16 to 10k for 9 years with no problem. Do you have any actual facts that prove these springs are designed for this RPM at the lift your cam provides? If not, there really isn't much arguement here. To say 200rpm is not considered an increase just doesn't make sense.

 

i have a b16a2 and in that b16a2 i installed ctr cams both intake and exhaust. i ran a 97 itr ecu and i revved the engine to about 8500 rpm with stock valve springs.. it was fine! nothing ever went wrong ! good luck

 

Valve springs are cheap and relatively easy to install. Even mild cams get extremely close to causing bind on stock valve springs, and control the valves very poorly at high lifts. Although many people do run stock springs with ITR/CTR cams, I don't think it's a great idea.

 

you do know that NON Type R VTEC valve springs are actually STIFFER than Type R valve springs for the exact reason that you pointed out, right?
non Type R VTEC heads have heavier valves thats why the springs are stiffer.
i did it (shifted at 9000 RPM) for a year and a half with mine with no valve float (or any other) issues at all. JDM Gen II B16A engines also have dual exhaust valve springs that the USDM and the export B16As dont. thats why i asked him if he had the Gen II JDM B16A.

what i should have said is that 200 RPM isnt a great incease considering what the engine is capable of.

back when i thought they were hot ****, i traded my friend (cant remember what i gave him) for CTR cams springs and retainers that he had in his LS VTEC. the stock B16A springs were in fact stiffer than the CTR springs.

 

My set un is basically bolt ons, Hytech replica header, AEM V2 CAI, adjustable FPR 2.5 mandrel bent exhaust
it is an EK4 civic it have single springs on exhaust.


so rev past the stock limit is risky.

I will check out about intake mani and TB

 

right!! just like i said. all export B16As have single springs on the exhaust side but the intake side are dual and they are much stiffer than the Type R springs. so 9000 RPMs with Type R cams on those springs is ok. if you use the Type R exhaust cam you'll need dual springs because the valves are heavier.

you will still need cam gears in order to shift your powerband higher.

 

I retract what I said. It looks like GS-R/B16A intake valve springs are identical to USDM ITR valve springs despite having different part numbers. So as long as you don't exceed ITR lift/duration on the INTAKE cam, you're good to raise the rpm. However, I don't know how your exhaust valves will respond. The safe thing would be to get dual springs for the exhaust, too. That is what Honda decided to do, after all. On the other hand, the B16A exhaust lift is much lower than ITR/CTR exhaust lift.

 

Yes, well known that one can move the intake springs to the exhaust side and order the ITR intake springs to complete the set.

EG6master, I have no way to test spring seat pressure/etc. Without the tool I am unable to verify your claims that the B16 springs are stiffer.

 

I was under the mistaken impression that GSR/B16 intake springs were different from ITR intake springs.

 

they r different. the ITR valve springs are lighter. thats why it has a different part number.