[image][/image]Hi, so I've been trying to dial in the cam on the replacement engine.
It is a Comp Cams 252H. 106 center line.
I have a 5/8 bolt 4" long stuck in the lifters pushing on the dial indicater.
I am checking exactly like the Echo video, with one difference, which will be my question, at the end.
I can precisely repeat the measurements.
When the crank to cam gear is dot to dot my center line is 96.5 #. (52 + 141=193, ÷ 2 = 96.5)
If I wind the cam counter clockwise 1 link I get
117#. 73 + 161 = 234, ÷ 2 = 117
If I go one more link counterclockwise I get
135# 91 + 180 = 271 ÷ 2 = 135.
I believe I am advancing the cam, as now you can really see the intake valve open before TDC.
If I go the other way, one link clockwise I get
82.5#. 39 + 126 = 165 ÷ 2= 82.5. and the valve is opening after TDC.
So my question is, unless you can tell me what is happening, am I getting these results because I am checking direct lift, and not lift at the valve, with the 1.5 rocker ratio.
I feel I am adjusting the cam timing as good as changing to a multi slotted gear. Maybe I'm wrong about that.
Thanks for reading. I hope to get this figured out before calling Comp Cams.
It is a Comp Cams 252H. 106 center line.
I have a 5/8 bolt 4" long stuck in the lifters pushing on the dial indicater.
I am checking exactly like the Echo video, with one difference, which will be my question, at the end.
I can precisely repeat the measurements.
When the crank to cam gear is dot to dot my center line is 96.5 #. (52 + 141=193, ÷ 2 = 96.5)
If I wind the cam counter clockwise 1 link I get
117#. 73 + 161 = 234, ÷ 2 = 117
If I go one more link counterclockwise I get
135# 91 + 180 = 271 ÷ 2 = 135.
I believe I am advancing the cam, as now you can really see the intake valve open before TDC.
If I go the other way, one link clockwise I get
82.5#. 39 + 126 = 165 ÷ 2= 82.5. and the valve is opening after TDC.
So my question is, unless you can tell me what is happening, am I getting these results because I am checking direct lift, and not lift at the valve, with the 1.5 rocker ratio.
I feel I am adjusting the cam timing as good as changing to a multi slotted gear. Maybe I'm wrong about that.
Thanks for reading. I hope to get this figured out before calling Comp Cams.