Question about degreeing cams

[Carl H]

Has anyone degreed cams in an rb engine before...I suspect that my car feels slugish compared to pre rebuild due to the decked head and block and the cams wernt compensated for it.I have tomei cams (hydro 260/8.8mm intake and exhaust) and they came supplied with the following numbers: adjust pulley intial 115 and center line 32*.How do i apply these numbers to the degreeing methodology?is max lift suppose to occur at 115*?I've done alot but not this and I am a bit lost here...

[Sil240]

http://www.hondatuningmagazine....html

Maybe this might help.I'm reading through it right now.My block and head were decked too.

[Bluefire]

i think with the tomei cams you just have to degree them on a dyno and look for where the make the most power, or where you like the powerband. I've tried talking to some of the guys at tomei, but they're clueless. They actually told me they would have to call japan in order to find out the lift at specified cam degree/ centerline.

[Darius]

I know of a good writeup with pictures on supraforums, but it looks like the pic links got disconnected since a couple of weeks ago.

http://www.supraforums.com/for...74428

Do you know the specs of the Tomei cams at 1mm lift?

[Carl H]

i dont, the information tomei provides is vague at best...i assume that the 115 value refers to 115* at max lift but i have NO idea.

[jdmser]

There used to be a really good video on youtube about degreeing cams. It was from one of the big turner shops but, I can't remember which one.

[klattr1]

There used to be a really good video on youtube about degreeing cams. It was from one of the big turner shops but, I can't remember which one.

Twins Turbo is the shop.

http://www.youtube.com/watch?v=ntHPLXE5juE

start at 4:30
Modified by klattr1 at 12:26 AM 5/18/2009

[placham]

I got a question, since you guys are talking about cams, and Carl has an RB20.

RB20DET motorQ's- HKS cams 264* at 9mm of valve lift, for both intake and exhaust, would stock valve springs be okay at 9mm or should I replace them?

Q's- Is it ideal/okay to mix different brand cams with valve springs, for ex. Hks cams with Tomei valve springs(this migt seem dumb q's but no reasont to open new thread)

Thanks.

[Carl H]

i ran the tomei procams (260/8.8mm) on my stock springs for quite a while with an 8.5k redline...but I'd put springs in just in case.you can mix and match springs as long as they are for the std retainers...iirc the jun retainers require their springs.make sure the cams clear your head, the tomei cams i have come SUPER close to the head.