Altronics digital degree crankshaft and camshaft position tool is an easy to use camshaft degreeing tool that enables engine builders to pinpoint TDC, find the camshaft centerline measurement and the cam duration. Using a separate dial indicator reading off a lifter or the valve it can help pinpoint valve events relative to crank position with 0.1 degree accuracy. Engine builders can use either the piston stop method or dial indicator method to establish exact TDC and camshaft position. This also allows you to display the installed camshaft centerline using the same .050-inch before and after method. Once you find max lift with the dial indicator, rotate the engine counter clockwise to approximately .100-inch before max lift and press the menu button. The prompt tells you to rotate clockwise to.050 before max lift. The digicam notes that position. Then press the BTDC (before top dead center) button and you are instructed to continue clockwise to .050-inch after max lift. Press the ATDC button and the display will indicate the crank centerline. Pressing any button after this will return to display the crank position.
To find the camshaft duration you rotate the engine to zero lift with the lobe on the base circle of the cam. Adjust the dial indicator to zero. Press the menu button until "Cdur" is displayed. Then press select. The prompt will instruct you to rotate clockwise to .050-inch lift at which point you press the BTDC button. Then continue rotating over the nose and back down to .050-inch before valve closing at zero lift. Pressing the ATDC button will display the cam lobe duration. Note you can use any checking point such as .006-inch, .020-inch or whatever your cam card indicates for seat to seat timing. And you can verify opening and closing points at the same time. Pressing any button again will return to showing crank position.
Digicam adapters fit Chevy small blocks and big blocks, LS1s, Mopars, Oldsmobiles and Pontiacs. It runs on a pair of AAA batteries. The supplied bolt and spacer may or may not fit your particular engine depending on the particular combination of crankshaft and timing cover. You can also use it with the heads off by making a spacer to fit directly to the timing cover mounting surface. Then you can use a cam checking dial indicator directly off the lifter to accomplish the same measurements. The digicam is available from Altronics, www.altronicsinc.com
Digicam kits include a rotary encoder assembly and a assortment of interchangeable sleeves that adapt it to all popular crankshafts
The sleeves adapt the encoder hub to the front snout of your crankshaft. Set screws are tightened into a groove to lock the sleeve firmly in place.
A piston stop installed in the number one cylinder helps you find top dead center.
You can use Summit Racing's spark plug hole piston stop (left) or their deck surface piston stop (right) to provide a solid stop for the piston while determining TDC.
ProForms dial indicator cam checking tool is used to read lifter travel with the heads off the engine.
The Digicam installs onto the crank snout and is secured in place with a long bolt and spacer installed in one of the timing cover bolt holes. This holds the unit steady so the rotary encoder can be turned with a ratchet.
The encoder runs against a rubber tread surface with the proper amount of friction to provide precise measurement of the crank's rotational progress.
Here the digital readout is indicating an installed centerline of 110.7 degrees.
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