did a bit of digging on here and see that a lot of guys like the BC stage 2 or 3 cams, but does anybody know anything about the Kelfords? They were suggested to me by a buddy of mine that has them in his EVO and swears by them. I'll be running them in a built block with the JWT 700bb kit, thinking about going with the 256/264... thanks guys.

 

I can't comment on the Kelfords (never even heard of them), but I have Crower Stage-2's in mine and they are excellent on the street. No driveability issue and I daily drive my Z.

 

256sounds barely anything over stock. What are the full specs though. There's more to cams then duration.

 

Do you have any head work or planning on any ? That is just as if not more important than the cams them selves. I personally have tomei 264. They run awesome and breathe amazing up top. I also have extensive head work.

I have never heard of the cams you mentioned. Like mentioned before what's the specs of the cams ... like lift along with duration.

When you say 256/264 are you thinking of running different durations on your intake and exhaust ?

 

Stock cams are 238 deg. intake and 240 deg. exhaust. Lift is 9.57 mm.

The Kelford T-189-A cams are 256 deg. intake and 264 deg. exhaust. Lift is 10.50 mm.

The JWT C2 cams have 261 deg. intake and 261 deg. exhaust. Lift is 11.58 mm.

BC Stage 2 cams have 264 deg. intake and 264 deg. exhaust. Lift is 10.82 mm.

I have heard good things about Kelford cams, though I have never used them. There is less overlap of the intake and exhaust lobes when the intake cams are fully retarded in comparison to the JWT cams, which should mean a smoother idle. They have less lift though, which means a little more restriction compared to the JWTs. I don't know what the overlap of the BC cams is because they don't publish enough data to determine this.

I have been curious as to the benefits of having greater exhaust duration in comparison to the intake duration on a turbo motor. Perhaps the greater exhaust duration helps when there is back pressure caused by the turbines.

 

On our cars the heads flow very well, the cams become restrictive before the heads.

I have heard of Kelford cams they have a good reputation, but I have never heard of a VQ35 running them.

 

I wasn't talking about flow. Although boosted flow would def benefit you. I was talking about springs... pending on what cans you get ... the lift may require it.

 

You are the first person i have ever heard say upgraded springs and cams are extensive head work Extensive head work Typically means port, polish and larger valves. Upgrading springs is always a good idea when getting higher lift cams for the cost of them it wouldn't make much sence not to upgrade them.

 

Inlet Duration @ 0.3mm: 256
Exhaust Duration @ 0.3mm: 264
Inlet Duration @ 1.00mm: 216
Exhaust Duration @ 1.00mm: 222
Inlet Valve Lift @ 1 to 1: 10.50mm
Exhaust Valve Lift @ 1 to 1: 10.50mm
Inlet Centerline @ Full Lift: 125
Exhaust Centerline @ Full Lift: 116

this is what i was able to get from a real quick search of the website

right now i dont have any head work, but when i replace the cams i may have some porting and polishing dont, but nothing crazy...

i have heard of some of the older DSM guys doing this to help flow out of the cylinders, keep the exhaust cam open longer and you get some of the intake air coming in to help push the exhaust out... not sure if it really does much good though... thanks for the info though ttg35

 

headgames only uses kelfords, or at least recommends them in all their VQ head builds..

they'd be a good company to contact for more info on them since they use them day in and out

 

thanks, i'll shoot em an e-mail or phone call tomorrow