Your piston stop can thread into the spark plug holes or simply be a strap that pulls over the deck of the block.
#DEGREEING HARLEY EVO CAMSHAFT INSTALL#
Install the degree wheel on the nose of the crankshaft and position your pointer-often just a piece of wire-over the degree wheel, as close as possible without touching it. To find piston TDC, you will need a degree wheel attached to your crankshaft, a degree-wheel pointer, and a piston stop. These factors include, but are not limited to, an improperly marked timing chain, errors when machining the block, assembly errors, or even an improperly ground camshaft. But it should always be checked because any number of variables can throw off cam timing.
At this point, the camshaft should be installed as your cam manufacturer intended. But before we can do any of that, we first have to find the crankshaft location when the piston in the number-one cylinder is at top dead center (TDC).Īfter you have installed your crankshaft and camshaft and connected the two with your timing set, take a moment to make sure you have your cam installed "straight up," which means the tick marks on the timing gears point toward each other. So, turn to page one in your textbooks class, we're about to have some fun.īefore you start any of this you will need to have a degree wheel to time your motor:įinding piston TDC Timing your camshaft involves measuring total lobe lift, the lobe centerlines for both the intake and exhaust lobes, camshaft duration at 0.050-inch lift, and lobe separation. But the methods Hidbon uses to present these sometimes difficult concepts are about as simple and easy to understand as we've ever heard. The NASCAR Tech Institute's method for degreeing a cam isn't unique in fact, most engine builders follow some variation of this method. We understand that long how-to articles about degreeing in a camshaft can make a reader's eyes glaze over, but when we heard instructor Craig Hibdon's methods for teaching camshaft timing and how well his students responded to it, we asked if we could base an article on his class. Issues such as checking cam timing to make sure it matches up with your camshaft card, advancing or retarding the camshaft to influence power production, and even checking and understanding how such things as overlap, duration, and even total valve lift are taught as a foundation because it affects almost everything else. Proof of this is the fact that students in the NASCAR Technical Institute's upper-level race engines class begin their course by spending an entire day or more discussing nothing but camshaft timing. Plus, the ability to modify your cam timing can help tailor your engine's power curve to your needs. But it is also vitally important because getting it wrong can cost you serious power. Timing Tech Top Techniques And Tips For Setting Your Camshaft Timing From the February, 2009 issue of Circle Track By:Ĭhecking and adjusting the camshaft timing can be a little bit intimidating to racers or first-time engine builders because it is a bit complex at first.
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