Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Custom Grind Cams and Intake Manifolds...Can Make..Need Input

Dude, I heat treat shiz all day long, it's my job, as I design axles! The rear shafts on the new Hummer 2 are mine!
Depending on what frequency and current you put through the coil that goes around the part you are heat treating (induction coil hardening) you can control the depth of the heat treatment. You do NOT want something through hardened, i.e. the whole x-section is the same hardness, as that takes away from the fatigue strength of the part. I can assure you that cams are not through hardened, so they have a "shell" of varying hardness (softer as you get deeper), up to a point and then from there on in it will be essentially all the same hardness to the center of the part. This technique is used on axle shafts, cams, conrods etc.
Nitriding and carburizing are as you said, a surfacing hardening treatment that has an extremely thin shell that is significantly harder than the core of the part. They use this treatment on diff cases a lot, especially helical cases, like the Quaife.

Aussie, How would Kryo treating the part affect it's longevity? Cool treating instead of heat treating.

I was not aware that there was such a method of heat treating. I'm used to the old ways where to heat treat a part it is "baked" in an oven at a controlled temperature for a specific ammount of time to sufficently heat soak the part.

I'll make this the new thing I learned for today.

If you guys are looking to make more midrange torque then cams isn't going to do much for you.

Vadim@Shop Shop made 10hp/5ft less than I did using stock SVT cams. Most of the bottom end torque is there as a result of decresing the restrictions from the intake. My port and polish and his EH heads flow really well, plus really good flowing LIM and TB is part the key.

I don't think anyone here has done that other than me and him has done that. Coincidently we are the only ones making good amounts of torque.

Not to mention I'm using MSDS headers and he was using Sean Hylands with a cat-back exhaust.

Sorry for butt'n in, but I thought it was possible to add material to the lobes by flame spraying or some such method. Thought I saw that in a hotrod book some time ago.

Metal spraying is a process used to repair/ recondition worn parts such as splines etc.It can be used on cams but would involve some heat treatment after spraying and a total re-machine to get the shaft back to spec due to the localised effects of metal spraying...

Well I got to talk to my supplier a bit more and the cams can be done, no problem. Of course that'll mean I will need to send him a complete Head (you sick minds ) and they will inspect and do R&D on it and see what changes need to be made. I'm gonna of course provide alot of input from the numerous suggestions I'm receiving here so pour on the knowledge it'll bring lasting benefits for the true Duratec Enthusiasts

I can even have them do larger valves and porting on the heads if I'd like...OOOOHHHHH!!!

Appreciate your efforts for good ole' Duratec. What would be real nice for us N/A fans are complete head packages. Because people who would do cams would likely do big valves, porting at the same time. And then you would want high RPM capability to exploit it (better springs, retainers etc).

So, fully assembled heads with full porting, cams, upgraded valvetrain/3L valves designed to work together and dyno tested for either 2.5L or 3L would be great. This might even temp me when I'm closer to warranty expiration....

Is it possible to change the ratio of the "fingers"? like going to bigger rockers. Maybe between the cams and the fingers you can get even more?

I'm gonna see if I can obtain a full SVT 2.5 motor in good working condition to have my shop look at. That would be the best way to go.