sek2dts@aol.com...
u mean don't lock vtec rocker arm during degreeing.
can you explain more how to degreeing pro3
TQ
heres skunks2 instructions. after u have degreed the cams in your not gonna be finshed. degreeing cams put u really close to where u need to be and saves alot of time and money for dyno usage but it will put the cams in a spot where u can just move the cam gears back and forth a degree or two instead of guessing like having them at 0-0 and having to move them around + and - 5 degrees to find out where they start to make power which could be very dangerous moving them around like that. it would be like having factory cams installed at -5in -5ex and not knowing what direction to go and make power and u guess and start moving the ex cam forwards back towards 0 there gonna be a big possibility your gonna bend your valves. thats why doing this is very important on a large cam.
skunk2 instructions.......
One of the keys to making power is to properly set camshaft timing; in other words, when valves open and close in relationship to the position of the piston and crankshaft is critical to the performance of the engine. The process of properly setting the camshaft position is referred to as “Degreeing the Cam”. Many beginner tuners mistakenly believe that to degree cams means setting the cam gears at a certain position such as “+1 intake & -2 exhaust”. Though this information may be useful at times, these settings may not be accurate on all motors. For example when the deck of a head or block
is machined, it will retard the cam timing. So the cam gear setting method may only apply to engines using the same type of cam gears with exact same head and block heights; and this also assumes that the given cam gear settings are the correct location for the cams. The most accurate way to set camshaft position is to properly “degree the cams”; this way you can be sure the cams are in the right position regardless of engine variations, deck heights, and cam gear marks. The method we are
introducing is a simple method for setting cam positions using peak lift measurements. Cam degreeing can also be used to check valve opening and closing positions, durations at various lifts, and peak lift measurements.
Step 1: Install a Degree Wheel onto the end of the
crankshaft, and bolt a pointer onto the block. The pointer
can be a sharpened piece of welding rod or coat hanger
that can be bent to change the position of the pointer.
Rotate the crankshaft to TDC, you can use a dial indicator
inserted down the spark plug hole or the piston stop
method; the piston stop method is more accurate. When
the crankshaft is at TDC, move the pointer so it points to
TDC / 0 degree on the degree wheel.
Step 2: Set-Up dial indicator with the tip on the retainer,
not the rocker arm. To get an accurate reading, It is
important to make sure that the axis of the indicator is
parallel with the axis of the valve. Make sure the rocker is
on the base circle of the camshaft, in other words, make
sure the valve is completely closed, and zero out the dial
indicator. We recommend that you degree the cam with
the lash set at 0.000.”
Step 3: Rotate the crankshaft. When the cam starts to
open the valve, the dial indicator will show the amount
of valve lift. Rotate the crankshaft and stop when the
pointer is pointing at the specified peak lift/center line
position. Loosen the cam gear bolts and rotate the
camshaft until the indicator is showing that the cam is at
peak lift. Tighten the cam gear bolts. Rotate the engine
two more rotations, stopping when the dial indicator
reaches peak lift, look down at the degree wheel to
make sure the position of the crankshaft is in the correct
location. If not, repeat step 3.
Step 4: Move the dial indicator to the other side of the
head, and repeat steps 2 and 3. When peak lift positions
of both the intake and exhaust cams are set in the proper
locations, the cams are considered to be degreed in.
Helpful Tip 1: When degreeing a camshaft, make sure
that you rotate the crankshaft in the direction the
engine normally runs. If you over shoot the position the
crankshaft is supposed to be in, do not rotate the engine
backwards, it will throw off your numbers because the
tensioner only works properly in one direction.
Helpful Tip 2: If you are having a hard time finding
the centerline because the cam dwells at peak lift, you
can take a reading of the degree wheel when the cam
reaches max lift less 0.003” before and after peak lift.
The middle of those two positions will be the centerline.