The process ensures that a cam's centerline is in its correct position for your particular engine. The guesswork's eliminated.Ĭam degreeing is more than a twist of a couple of adjustable cam gears based off of where the cam gear maker says “0” is. Cam degreeing ensures that the cams are in their correct position. To be sure, cam degreeing is more than simply the twist of a couple of adjustable cam gears based off of where the cam gear maker says “0” is. Neither does the kid on the innerwebs whose got “the same setup” and assures you that a couple of degrees of advance on your intake cam is exactly what you need. Your cam gear manufacturer has no idea how many times your block's been surfaced, how much your head's been milled, or whose cams you've got. But don't think that cam degreeing has anything to do with dialing in your adjustable cam gears to some magical, predetermined setting. You'll need adjustable cam gears to do all of this as well as a degree wheel, a dial indicator, and some basic hand tools. The consequences of not doing so are piston-to-valve contact or, at best, lost power. It's a process that should be done whenever aftermarket cams are swapped into place or any time the distance between the valves and pistons has changed-like when using a thicker or thinner headgasket or when a head's been milled-before firing it up. The process positions a cam's centerline-in crankshaft degrees-exactly where the cam manufacturer says it should be. It's also a good way to make sure that your valves open and close at precisely the right time. All of this should be enough to make you want to degree your cams.Ĭam degreeing-or “zeroing in” cam timing-is a good way to make sure that your cams are performing the way they ought to and that your piston-to-valve clearances are what you think they are. Even a new timing belt, timing chain, or tensioner can affect cam timing. Small tolerance changes or amounts of material removed will change the distance between the cams and the crank, which will alter their relationship with one another and affect cam timing. This is even more important to pay attention to once aftermarket cams, adjustable cam gears or other mismatched components-each with their own tolerances-are introduced as well as once an engine's block or cylinder head have been resurfaced. The rise and fall of its pistons has to sync with the opening and closing of its valves, which happen to be controlled by its cams. The relationship between an engine's crank and its cams is no different.
You might even end up with a scenic view of your bottom end. Say your spark fires before your pistons are in their right spots-you might embarrass yourself on the dyno. An engine works best when the right things happen at the right time.
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