Hey Nick,
Just saw this. I looks like I'm not getting notifications from T-M anymore (again), so sorry for the delay. At the moment, I have no 8V engines on stands (that aren't completed), or have 16V's, so not real easy for me to degree a 8V camshaft in at the moment. I would have to mock up a shortblock and head to be able to get some measurements for you. Won't happen real soon is what I'm trying to tell you.
Todd
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Nick,
You should go back and read this thread. The answer to your question was talked about at length, by some pretty knowledgeable people on this forum. Read posts that have info on Cam-Pro, Cam Dr., translating vs. pivoting follower, follower ratio, etc. In a nutshell, there is no easy formula to convert a Cam-Pro printout to actual #'s taken at the valve, as the follower on the Cam-Pro is a translating type follower, and the 2.2 uses a pivoting type follower. Audie Technology Valve Pro program is said to be able to convert translating profiles to valve motion, but it is just common practice to measure valve motion in the engine for pivoting followers.
I wasted a bunch of money constantly running various stock and aftermarket cam profiles on Cam-Pro measuring stands. In the end they were not even close to actual measurements at the valve. It did provide me some data on comparing one camshaft to another camshaft though, but not actual in-car specs.
I did post results from several different camshafts in this thread. Hope you saw those. There were at least five that I remember posting, maybe more.
Todd
Last edited by 4 l-bodies; 01-11-2022 at 08:26 PM.
Gotcha, so I've ran back through and read this post. So the duration doesnt actually change, but you'd measure .050 lobe duration at .0875 lift at the valve instead of .050.
My engine guy is going to run the cam on a cam dr. just to make sure its all good and the lobes for each cylinder are ground the same. He is going to give me a print off as well and I can post it. I went with a split duration instead of a reverse pattern.
Have your engine guy make sure he sets up the machine properly for your application. For starters, many V8 cams have the opposite lobe on the end. So make sure he knows the belt end lobe on the end is the exhaust (lol). Some machines assume setup for solid lifters, so they build in about .010 lash into the equation. Then others, the roller lifter they use are WAY off as far as diameter compared to Chrysler's .700" diameter follower. I have found many of Colt Cams camshafts (esp. the reground ones) to vary in base circle diameter a few thousands. Some even from intake to exhaust on the same cylinder. Like you said, the whole point of running it on a Cam Dr. is to check "stuff" like you do when indexing a crankshaft. Doesn't do you much good if all four cylinders events aren't taking place when they should be. Also make sure they set follower ratio on checker at 1.75-1.77. 1.77:1 is listed as the #, but almost all followers are closer to 1.75:1.
Look forward to seeing the posted results.
Todd
Last edited by 4 l-bodies; 01-21-2022 at 08:37 PM.
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