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Cam design



what do you do differently to degree the cam? how many degrees can you push before you start knocking your valves?
 
On the cam card you'll have valve timing, you're supposed to use a timing wheel to make sure the valve events occur at their specified time.

If not, you have to use a timing set that allows you to advance or retard the cam to get it as close to the specified timing to ensure it performs as designed.
 


matt5112 said:
Still rather incomplete.

What you're suggesting is ensure the cam is properly degreed more than anything else?
Click to expand...

Not so much, just saying that even drastic swings in cam design never netted more than a few horsepower here or there... most of the time anything severe resulted in powerband loss like you would find in a TEP / IS4, without peak power gains more than a hp or 2.

With the turbo stuff, we were making peak power around 4700rpms because the boost spiked up a bit.... otherwise it was flat across on our ST4/xpz stuff.
 
darkhorizon said:
Meh, its not that there is much to explain by it. The heads are just overall restrictive, valve seat and port size is too small to justify more "length" in the valve opening. Also the valve angle is very shallow which does not promote flow at high lift like a steeper valve angle would.

When force inducted you also run into issues of the intake not needing alot of lift to achieve the same results... Less valve lift and minimal ramp rate is going to give you better real world results by increasing your valvetrain accuracy on sub 150# springs.

ZZP has been there and done the lift thing, its not worth it for power, so now they only sell cams with 550-580 total lift on stock rockers. I was out there in grand rapids when they put 3 different cams in the impala, and it was clear that lift only hurt things, while installation angle actually produced more WHP swings than any other thing we could do in the cam profile (for reasons unrelated to valvetrain I may add, but that is a different thread all together).

So, there is your blanket response, any questions?
Click to expand...
I guess the .550-.580 lift is why ZZP doesn't seem too willing to set me up with their XPZ cam using 1.7 rollers. They told me it might bind using 3/8 pushrods, though on their site it says can be used with 1.7 rockers. I sent an email to Blue earlier about the XPZ cam card Matt and him were discussing, but I don't know if he received it with this new forum design.
 


Well im looking for easy on valvetrain yet sound cool. Gt2 should fit that bill.

Smaller than nic yet still quite a bit of overlap.
 


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