Pretty sure I found the culpret to all my Issues. *pics inside*...

[Shocker]

Well, thankfully to the person who posted the RB cam shaft issue regarding his CAS sensor, and aftermarket exhaust cam shaft not having the right key... I decided to look at mine.. I finally got my valve and head back and reinstalled, all do to the many problems I have had this summer.....

Anyways, I decided to inspect my exhaust cam shaft gear, before placing it back onto my head.. Well I compared the key on my HKS exhaust cam to that of my CAS. My cas is the star and half moon inside shape. My HKS cam shaft is just a slot.... Which I presume is a s2 cam shaft, and not a s1 exhaust cam shaft....

So I insert the first of 3 CAS I have aquired since I figured my CAS was bad from the crazy RPM signals my ECU was getting causing my motor serious Catastrphopy's.... and my lost of time and money. Anyway, I found I could insert my CAS any way I wanted, didnt matter how I turned it unlike the stock camshaft. So I spun the head of the CAS and the dowel that goes into the HKS cam stayed in the same spot.. ok cool.

Next I removed the O ring around my dowel on my CAS. Inserted it and turned the head of the CAS.. and what do you know... the dowel turns as well.

Turns out the only reason it seems my motor ever got a signal was because of my O ring causing enough friction to hold onto the exhaust cam shaft............. Im assuming as it started to get warm, and the engine was making full boost on the dyno.. IE 5000-5500 rpms, where the damn thing blew up. It was just to much force causing the CAS dowel to slip and cause my crazy RPM signal and thus predetonation....

heres pics, check it out....CAS dowelStock exhaust cam shaftHKS cam shaft

and yes I ordered a S1 256 8.8 lift intake and exhaust camshaft.....

[Coolwhip]

where's my cookie?

damn man that sucks, but atleast you got down to the bottom of your problem. Hope things work out quickly for ya

[Shocker]

yeah thats the problem, I've gotta talk to the distributer since it obviously seems they sold me the wrong cam shaft..... I just want a straight up trade... I have no use for the shaft unless I have a late model CAS.....

[Coolwhip]

what series CAS do you have?

Is it a cast cover, or a black plastic cover?

looks to be a Cast cover, aka S1, like mine..

[Shocker]

I have 3 actually, 2 are cast ALU covers, 2 is MITSU other is Hitachi, all have the same drive. One is from an rb20, the other two are from a rb25 s1.

[Carl H]

to use that cas you'll need either an r34 cas or a late model r33 s2 cas. black plastic housing is key to identifiying these.

[Shocker]

to use that cas you'll need either an r34 cas or a late model r33 s2 cas. black plastic housing is key to identifiying these.

unfortuneatly that costs more than the cam shaft itself... not to mention the plugs I think are different, so I'd need a bit of harness as well, not to mention even finding a black CAS....

What are the odds that these are NEO cams? are to heads generally the same besides for the lifters as far as the bolting down goes? and how the cam gears connect to the shafts? They intake cam fits fine the same as the exhaust, its just the CAS gear on the exhaust....
Modified by Shocker at 4:02 PM 8/30/2007

[Carl H]

chances are they ARE r33 cams but to suit the late series 2 motors...soild cams have a much more agressive profile than hydro cams.

[Shocker]

Found some info about my CAM issue. Talked to my distributer, who is a distributer for HKS. HKS basically told me Im ****ed, since the directions are in japanese. I should have more closely inspect my cam shaft before fitting it to my engine.. Ok point taken. My only problem is I got something I didnt order assuming it was correct and installed it. Doesn't matter I'm on the bottom of the food chain, tough **** for me basically.

I refuse to reinstall my stock cam shaft, so I will be ordering another, hopefully proper s1 cam shaft.

So I have forsale 1 exhaust cam shaft for the rb25, from Aug 97 to 1998 r33 motor. You will have to have the late model CAS, for this cam. Good deal you get it for only $270 shipped. The damn thing has seen about 2 hours of run time....