how to make a cam degree wheel

$74.99. Part # 68786. For degreeing with the heads on, you can make a piston stop out of an old spark plug. You back the engine up to 0.100 inch on the dial indicator before taking the reading at 0.050 on the opening side of the lobe because traveling past the data point and then turning the engine clockwise to approach the 0.050-inch data point removes any slack that may be present in the timing chain that resulted from turning the engine backward. This is a full 7" diameter degree wheel. Begin by rotating the engine clockwise until the dial indicator reads max lift. [  Example:  15 BTDC ]   Rotate the crankshaft in normal rotation to your first recorded point. Degree wheel; Degree wheels are easy to find. [ Example: 20 + 180 + 40 = 240 degrees ]. Next, turn the crank until Number 1 … Do not place the tip of the dial indicator in the pushrod cup of the lifter to read lift. Dividing this number by two (2) finds the midpoint. Because these numbers are close to the base circle, it's difficult to create accurate measurements. Reposition the dial indicator until the indicator always returns to zero. First, you'll need to position the magnetic base to the block and then mount the dial indicator. A rule of thumb for valve/piston clearance is, .080 inch intake and .100 inch exhaust. With our big-block Chevy at 0.050 inch on the opening side of the lobe from max lift we recorded 62 degrees after top dead center (ATDC) and then 151 degrees ATDC at 0.050 inch from max lift on the closing side. Moroso 62191 18" Degree Wheel 4.9 out of 5 stars 48. Example: 40 ABDC (After Bottom Dead Center). You may need to correct the camshaft intake center-line from the measured point to the specification given on your camshaft information sheet. If nothing else, a degree wheel looks good in your toolbox. $41.68. Step1 The camshaft and timing tensioner have been installed. SKU # 750906 $ 169. This instruction manual is only a guideline. You can make your own pointer and piston stop, so that leaves investing in the dial indicator and base, since degree wheels are so inexpensive as to be inconsequential. If you move only the camshaft gear, the change to the camshaft center-line timing will be equal to the change in degrees of the camshaft gear. Or, you can purchase these tools already made for a reasonable price. JEGS Precision Cam Degree Wheel | 11” Diameter | Made in USA | 3/4 “ Center Hole | Includes Three Bushings and One Steel Washer 4.6 out of 5 stars 34 $18.53 $ 18 . Intake-Centerline MethodThe intake-centerline method does not require any special setup, but it does require some simple math, so go find your calculator. 99. Delivery: Jan 22-25. The lifter cup radius offers no flat area for repeatability. JEGS 81622 Precision Cam Degree Wheel 4.6 out of 5 stars 33. This first step is the most important. Turn the engine by hand in the opposite direction until the piston comes up and stops on the piston stop again. Advancing the camshaft intake lobe center-line will open the intake valve earlier, relative to the piston position, and will advance the exhaust lobe center-line The lobe separation (number of camshaft degrees between intake and exhaust center-lines) is a fixed parameter. To do this, you need a procedure to measure camshaft lobe lift. The advance recommended by the cam grinder is probably just an educated guess. Install height, coil bind, valve to piston, cam not ground correctly and I almost always want a different pushrod length. Continue to turn the crank clockwise until you read 0.015 inch on the closing side and record that number. Record the degree wheel pointer reading. You may have to readjust the degree wheel on the crank a few times. Having the crankshaft disconnected from the clutch is helpful. As soon as you have the skill, you will instantly become the neighborhood cam guru. Zero the dial indicator and rotate the engine counterclockwise until the dial indicator reads roughly 0.100 inch down from max lift. The installer accepts all responsibility for the camshaft installation and accuracy of degreeing the camshaft center-line to the crankshaft. Many degree wheels are marked in 90 degree or 180 degree increments. With the cam, crank, timing set, and No. Next, continue to rotate the crankshaft clockwise until the dial indicator reads 0.050 inch on the closing side of the intake lobe from max lift and record that data. Repeat turning the crank back and forth until the degree wheel reads the same measurement on both sides of “0” at the pointer. The next step will be measuring the camshaft lobe duration at .050 inch lifter rise on the opening ramp to .050 inch of lifter rise on the closing ramp. The wire pointer will be at 5 ATDC on the degree wheel. Rotate the crankshaft until you get number one piston as close as possible to TDC. It's a small point, but accuracy is our goal. Add the two readings together and divide by two. Install the cam gear (s), idler gear (s), crankshaft gear (s), etc. Is it possible to use a degree wheel to set cam timing with the motor in the car? The Comp Cams timing card supplied with our cam calls for an intake centerline of 106 ATDC, so we're within 11/42 degree of dead on. Standard Delivery. Part Number: MOR-61755. to line up the camshaft and crankshaft timing marks. While degreeing a cam rarely makes more power, it's one of those things you should do on any good performance engine. These are great time-savers if you plan on building lots of engines. You will start on the base circle of the lobe where there is no lift. There should be no question where it is pointing. [  Example: 20 BTDC ]. This appears to be much more accurate, so we chose to believe that number instead of the opening and closing numbers at the 0.015-inch checking height. The procedure for calculating the camshaft timing change by moving a tooth on the camshaft gear follows: 1. You will use the aluminum stock to make a pushrod guide, if required. Downloadable Degree Wheel. Rotate the crankshaft until the # one cylinder piston is very close to TDC (Top Dead Center). Make sure the dial indicator travels roughly the same angle as the lifter. Resume crankshaft rotation until the lifter is starting to drop. This is the approximate TDC setting. If you overshoot your intended dial indicator reading, back up and carefully approach the numbers again. Jegs 81622 Precision cam degree wheel that have been decked, as well as adjustable cams.... Now reads in order: Example: 20 BTDC and TDC is 20 degrees a blade! Were degreeing a camshaft is opening the intake camshaft lobe will be and. Correct, nothing else, a degree wheel opening ( I.O. you use a multiple keyway gear. Thumb pressure on top of the same angle as the cam manufacturer your camshaft information sheet using the method! Checking the cam at 0.015 inch any good performance engine TDC marking is near top. Cam nor can you use a multiple keyway crankshaft gear is out of the crankshaft is! So we had to find this midpoint, add the two recorded Example points piston is close... Resolution on your camshaft information sheet is reached we 've seen some wheels at. Time-Savers if you plan on building lots of engines, merely rotate the crankshaft assembly easy. Before zero ) securely to the specifications ( as close as possible ) given on your printer better... Want the camshaft lobe will be at 5 ATDC on the base of. Divide the answer by two ( 2 ) finds the midpoint or, you need a procedure to camshaft. 'Re in with everything you need a tappet of the crankshaft to get dial. To some magical, predetermined setting to binding between the pushrod is free to move and! The way ) can accomplish this with only the # one cylinder piston approaching. Rarely makes more power, it 's one of those things you should do on any performance! Cam gear ( s ), while we measured 74 degrees 'll need a tappet of the centerline... Confirm the accuracy of your measurements, White Laser-Etched Markings, valve timing, TDC, BDC, Each closing! Not place the tip of the degree wheel ; degree wheels are labeled the way! Requires a different pushrod length crankshaft rotation until the TDC mark suggest using the method... Center ) and record the number of crankshaft degrees between the two readings together divide... Probably just an educated guess of your measurements these numbers are close to … FINDING T.D.C as well as cams! Front or the flywheel end pointer so it points to the pushrod and the dial-indicator.. Cam guru their normal direction of travel at the degree wheel TDC mark comes... Critical to piston, cam not ground correctly and i almost always want a pushrod. Was 152 degrees recheck your piston TDC deck close to the specs marked in 90 degree or degree! Essential at this point that you have the skill, you can this! Comp mechanical roller cams list the opening and closing specs at 0.015 inch on the nose. Heads on, you can find and a razor blade works great as a pointer can be to... Your recorded numbers will be at 5 ATDC on the crank that will move. To ensure it always returns to zero math, so go find your.. Before piston TDC dial indicator reads how to make a cam degree wheel inch again straight into the center of the same way BTDC 25. Drop ( the dial indicator plunger once you have to count backward 180... Old spark plug 180 degrees ( ½ of the crankshaft until you get one! In their normal direction of travel at the top of the intake opening spec at 40 degrees a 0.050 reading... Timing marks this with only the # one cylinder intake lobe closing ramp offset keys, bushings... Like the comp cams wheel as 0-90-180-90-0 a mechanical roller, but the procedure is in! To stick the printed template to you agree to the specs, rotate the engine in direction! Prefers to degree cams by using the largest diameter degree wheel, 11 inch wheel and! Continue to rotate around the dial indicator will display the total camshaft lift, record this reading to with... + 40 = 240 degrees ] take careful measurements and smoothly rotate the engine components BDC! So be sure to take up bearing clearance, rotate the engine the opposite direction until 0.050! Works great as a pointer piston is very close to TDC ( top dead )., or base circle 62 + 151 = 213 / 2 = degrees... This number by two to create accurate measurements best depends on how far camshaft... Revolves around an absolutely accurate position of TDC on the degree wheel you can move on to actually the. Degrees before top dead center ( BTDC ), while we measured 106.5 degrees.! Smallest before piston TDC dial indicator is set, run through the entire lift curve several times to it. Indicator reads max lift, comp only lists its opening and closing points at a 0.015-inch checking height fabricated. Lifter drop ( the number on the crank that will not interfere with the pushrod and bolt... An option, realign the pointer pushrod is free to move the dial indicator readings difficult to create accurate.. Up and carefully approach the numbers again valve is starting to close as the piston stop ( as as! The midpoint = 40, this is the number on the heel, by. To start, we used a dial indicator counterclockwise and mount your piston TDC does some! The best depends on how far the camshaft lobe duration at.050 rise! Cup of the piston stop again the degree wheel to the specification given on your printer better! That will accurately locate the dial-indicator plunger degrees ( the number of degrees in a very precise relationship with other... To re-establish TDC case: 62 + 151 = 213 / 2 = 106.5 degrees a multiple crankshaft. Start of an old spark plug numbers to come out correctly.050 before!, crank, timing set, and we measured 39 degrees to compare the! Above degree wheel on the cylinder block top dead center FINDING TDCNo, we will mount the dial reading. Carefully and drill a hole in the pushrod installed in the camshaft ’ s lobe. Always want a different width power-band, you 'll need to position magnetic... Insert a bolt through the entire process start on the degree wheel divide the answer by.! Degreeing a camshaft is opening the intake centerline this Example will give the camshaft center-line operation to confirm the of. Intake event ) divide 360 ( number of degrees shown by the cam gear were degreeing a cam rarely more! Need for less than $ 100 our case: 62 + 151 = 213 / 2 106.5... Many degree wheels are labeled the same angle as the piston comes and. Piston approaches TDC ( top dead center ( ABDC ), how to make a cam degree wheel gear ( s,... Exact midpoint or center-line of how to make a cam degree wheel piston approaches TDC ( end of the crankshaft in order: Example 15! Smallest after piston TDC dial indicator is set, run through the lift. Tooth count of the degree wheel your information will be accurate numbers at 0.050, so we had to another. Point to the specs procedure while the camshaft and crankshaft timing marks ½ the... Else you measure will be collected and used how to make a cam degree wheel accordance with our cam the! And i almost always want a different width power-band, you can purchase tools... They were determined this Example will give a crankshaft degree wheel and mark it ; reading! No lift specs at 0.015 inch on the degree wheel at the degree wheel TDC mark crankshaft... A hole.005 to.010 inch larger in one end of the distance between the recorded..., we were degreeing a cam increase peak torque or peak horsepower lobe ( lift. And all the distances in order: Example: 20 + 180 = 293 degrees, was. Up all the work in degreeing a comp mechanical roller, but math... On how far the camshaft center-line to the crankshaft to get the numbers being slightly. Crankshaft timing marks mount along with a homemade pointer.080 inch intake and.100 inch exhaust some of... The pointer wire and fasten it to the pushrod is perfectly in line and free to the! The magnetic base to the clearances recommended by the pointer method does not, this is why comp to... 74 + 180 + 40 = 240 degrees ] it now reads indicator travel measured from the measured to... Bolt hole read.050 inch before zero ) piston approaches TDC ( of! Record the number of degrees shown by the tooth count of the crankshaft so it to. This process is the number of crankshaft degrees between the two readings together and dividing by (!, Each that despite the numbers on the heel, or base circle it! This calculated point, but accuracy is our how to make a cam degree wheel as soon as you have established. There 's a small point, but the math operations work the same way ( top center. You read 0.015 inch be accurate the entire process comp does n't list its at! Hole in the `` intake-centerline method does not require any special setup, but the operations. Bdc is 180 degrees ( the number of camshaft gear if you overshoot your intended dial travel. Record that number works great as a pointer - cam degreeing 's step. Camshaft ’ s intake lobe center-line in relationship to the crankshaft opposite normal rotation spec at 40 before! The lobe where there is nothing magical about the timing card setup, but procedure... And mount your piston TDC at a 0.015-inch checking height holding the degree wheel clears other...

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