People have told me that these cams make power up to 9000 rpm. When i get the skunk2 ecu the rev limiter i think will be set at 9200, or someone correct me if i'm wrong. I was wondering if running portflow inner/itr outer spring combo is good enough or too aggressive for skunk2 stage 1 cams for up to 9000 rpm? How about the stage 2 cams? This is all going into a b-18c1

 

ttt

 

You can run stock valvetrain with the Skunk Stage 1 cams. 'R' valvetrain is preffered though. Stage 2's require at least Portflow's inner valvesprings on both, int. & exh. sides...as the Stage 2's are a bit bigger in spec vs. the Toda B spec camshafts.

 

I am getting my JDM ITR intake valve springs soon and i will be installing that with my stage 1 cams. While moving my GSR intake to the exhaust side (same as ITR exhaust springs) and putting the JDM ITR Intake valve springs (stronger than USDM ITR valve springs), will it be safe for me to rev to the "stock" JDM ITR rev limiter(9000 rpm)? Skunk2 says to keep stock rev limiter if you're using the stock valvetrain.

 

you'll be fine reving to 9000 just as long as your making power all the way up there.

 

it seems to me that the skunk2 stage 1's are pretty mild and very smilar to ctr cams. It makes sense then that 9k preformance is possible w/ the itr valvetrain if, like katman sed, there is actual power to be found.

 

I hope you guys are right! It sure does save me alot of money not having to buy aftermarket springs.

A little OT but, will my gsr rods handle 9000rpm with 11.5:01 compression daily? I'm not saying i'm going to rev my car to 9000rpm 24-7, but i'd like to know how far i can push my car without having to find out the hard way...

 

ehh....i'd atleast shot peen them BUT...ive seen 9k on stock bottom end...****, i've seen 9500+ i seriously doubt you'll need to shfit that high bra, the 9k range is something that the stage 1's are a bit away from. ITS NOT A BAD THING, you just should dyno it to tune it and see where your power falls off.

 

someone very skilled on this board informed me that portflow inners and ITR outers and good to 12mm of lift. He also said that to use those springs with that much lift it's going to be necessary to check and correct installed spring heights to be sure your not binding.

 

Are titanium retainers a must for SKunk2 stage 1 cams + ITR outer/PortFlow inner valve springs to rev to 9k safely? Or can you stay with stock retainers?

 

i'd get em, they is a must in my book...stronger and lighter...it means alot to yor engine @ 9k...

 

now you're replacing the intake valves with itr's as well right?? the rates on the itr springs are lower than b16 springs due them controlling a valve that weighs less.. funny how people think going with a lower rate spring increases they're rev limit..

 

shotpeening is waaaaay overrated and really doesn't do as much as everyone thinks it does.. if you're just looking to burst to 9k occasionally, assuming your rods are in good structural condition, you should be fine with just going with a stronger set of rod bolts (arp's). it's generally the bolts stretching that causes a bent rod, not the rod itself just deciding to bend in mid stroke due to cylinder pressure.. that's assuming you're not detonating and having cylinder pressures through the fuggin roof! =P stock rods are quite strong and can really stand up well in a "tuned" setup but everyone seems to underestimate them and ditches them first thing.. ah well, i'll reuse your "scraps"..

 

they're not required but it's definately easier on the valvetrain to have a lighter retainer.. stock retainers like to go POP around 9500 so strength won't really be the issue unless you're wanting to rev to the fuggin moon..


[Modified by bojangs, 5:41 PM 3/21/2002]

 

what is the weight difference between gsr and type r valves?

 

shooting and cryo are not guarantees, you dont know if it worked until it breaks, BUT its cheap, why not and...ive seen plently of rods cut directly in half, crank side of the break bent from spinning around on its journal and hitting things and pin bore end straight, indicating a stress issue in the middle of the rod somewhere.

 

12% difference in weight.. i don't remember the actual difference in grams.. if the endyn board was up i could find the post that had the exact weights..

 

actually the Sk2 stage 1's are bigger than CTR cams....
they're more closely related to Spoon cams if anything. I just dropped a set of these in last night too (sk-stage 1's). I have comparision pics I took as well. I was running a Spoon int. and R exh cam. I like that combo...

The sk2 stage 1 exh. cam is a hellavalot bigger than the "R' exh. cam too. There's a good snap in my neck now, when vtec kicks on, more snappier than before. I think its all due to exh. cam though. The stage 1 intake cam looks pretty similiar to my Spoon intake cam when I compare the two...

I'll post some pics up soon..or IM me..


[Modified by Katman, 2:56 PM 3/21/2002]

 

ctr cams-in .449, 233 duration....ex .417,224
skunk2 -in .456, 252 ex .426,249

dunno man, pretty similar and mild in my book..i do see a nice difference in duration w/ the ex cams......maybe im numbed by crower3's tho.


[Modified by builthatch, 7:44 PM 3/21/2002]


[Modified by builthatch, 7:46 PM 3/21/2002]

 

heh yeah I think you're a little numbed...

You know gap of number between the ctr's intake .449 and Sk2's .456 doesn't seem all that, but when you see both camshafts in real life it's whole other story.

I've compared a CTR int.cam to a Spoon int.cam and its a world of difference. Everything is bigger on the Spoon cam.

I'll tell you this.
If you've ever seen a set of Auto b16a cams, they're a joke. Now take a set of those auto cams and compare them to set of R cams...pretty big difference right? well same difference when you compare a set of 'R' cams to a set of Spoon cams....and that carries over to the Sk2 stage 1's as well.

I just finished resizing some comparison pics I took last night...check it:
intake cam comparo..


exhaust cam comparo...


you can snoop this dir for more comparo pics:
http://tiiite.b16a.com/Specs/cams/

PS: I IM'd you about your Y8 domed pistons....still awaiting your reply

 

Sweet tech info Kat!! Hope the new site has a lot more good info like this!!

 

hah yea me too!

 

Wow, that skunk2 cams looks like good quality stuff

 

Titanium retainers easily offset's the weight dfference between R valves and GSR valves. I went with full ITR cams and springs on my GSR with Crower Ti retainers. 2 years and 9000 rpm everyday, no problems. I know power does drop off a little after 8400-8500 but shifting at 9000 brings me right in the sweet spot for the next gear, I'm also running a USDM ITR tranny. Not to mention the added rpm room up top really helps on some autoX courses where I really didnt want to shift into third. Limiter is set at 9200 but I rarely go there.

 

My skunk2 stage 1's peak at 7900 and i shift at about 8500-8600
my rev limit is set at 8600
how does that sound sould i rase my rev limit

b20 vtec
I'm running the skunk2 ti/valve springs