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Author Topic: Trickflow Stage 3 Camshaft Degreeing Results  (Read 4661 times)
El Hombre
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« on: March 20, 2016, 09:22:56 pm »

Just wanted to share the results of a camshaft degreeing verification procedure I did in a 289 .040" over. Since finding true TDC is the most key event in such a procedure, it doesn't make sense to not take the little added time and not do some camshaft lobes profile checking.

I found out that the the exhaust lobe in this case was changed for a longer duration with less lift profile over the advertised specs and the results did show that the lobe masters of that grind are from Crane. An old chevy base-circle for the intake and a LS base circle for the exhaust.

The advertised Stage 3 cam specs @.050" are:

236/248 .359"/.372" lobe lift (.574"/.595" w/1.6 rockers) 110 LSA +4 ICL @106 ATDC

In this case I found:
235/244 .359"/.346" (.574"/.554" w/1.6 rockers) 110.75 LSA + 2.25 ICL @108.5 ATDC

I took the valve open/close events @.050" and the ones for the .100", .150", .200", .300" in order to make a little exercise. From those results, the Crane lobe masters I was able to ID and the results are shown in the pic below:

I also tried to picture the lobe open/close rates using those results calculating the "lift/degree" based on those results. First one would be the increments of the readings taken per lift point and the "_T" version is the one we usually do using the @.050" opening - ICL/ECL - @.050" closing rates. Obviously, with no "smoothing" of the curves. The intake/Exhaust are shown below for comparison:

When we close into the resulting overlap triangle @.050" of +18°, the lobes lift show how different it is.

I did "reproduce" the lobes with cam analyzer focusing on the 0.050" and 0.200 duration results, and these were the @.050" lift bells:

 What I meant to say was... you do not know how your engine is setup unless you perform a cam degree and figure it out + understand it. Just like gapping the rings per cylinder/piston or checking main and rod clearances.  Asking


'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2

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« Reply #1 on: June 14, 2016, 09:10:53 pm »

Good analysis. Thanks for posting. Did the part number change?

So does this imply that the exhaust lobes for the other profiles (such as TS 2) would also have revised exhaust lobes?  In any case, interesting data. Thanks.
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