I tested duration at .006" and .050" lift.
The AU roller is ground on a 110.5º center when used with the roller arms it was designed for. I got about .412 lift intake and exhaust.
.050 duration intake and exhaust = 208º crank degrees
.006 duration, intake and exhaust = 240, 254º respectively.
If you put in a set of V6 rollers on a AU cam it has a 114º center, .442" lift intake and exhaust.
.050 duration intake and exhaust 210º crank degrees
.006 duration, intake and exhaust 242.4, 256.8º respectively.
If you run a stock slipper cam with the AU rollers you get a 121º lobe center.
Lift is .444, intake and exhaust.
.050 duration intake and exhaust 210º, 204º respectively crank degrees
.006 duration, intake and exhaust 278, 247º respectively.
I will test the V6 rockers on the slipper cam later, the lobe center on those will be even wider, probably 129º.
I need to re- run all my tests just to be sure. Like any new setup I am learning how to use it and take good data.
Right now I just pulled the info into a spread sheet and crunched the numbers. I took a valve lift reading every .032º or 10,000 reading per revolution. The encoders I used to measure valve lift have a .0005" resolution.
Lots of data... Lots of learning.
Conclusion so far:
AU roller cam looks just like our stock cam when its used with the parts its supposed to have.
If you use V6 rollers with the AU cam It gains some lift and 4º of lobe separation. However you will need to add some clearance so the valves don’t hang open, the lash adjusters will bottom out. The profile looks good, I need to look at it some more. So far it looks like a good street turbo cam.
Rollers on a stock slipper cam gives you a very wide cam angle, slower valve opening at initial lift and is seems to fast over the nose of the cam.
The base circle of the roller is larger.
I need to get slipper rockers to run a baseline with.
Now that I have done this a few times it should go faster.
More work next weekend...
Edited by TurboRaider, 16 February 2009 - 01:14 AM.