On the other hand, if the camshaft timing is retarded, the intake valve will open and close later in the rotation cycle (usually sometime during the compression stroke). You can find out how things like what lift, duration, and valve events are, and we have even covered choosing a cam, and the difference between types of camshafts, but what do you know about camshaft timing? What really happens when a camshaft is installed at “zero” (straight up), or advanced? In theory, advancing or retarding the camshaft’s timing moves the engine’s torque band on the rpm scale by changing when the valve events occur, but how much, and in what direction?Ī camshaft that is advanced four degrees causes each valve opening and closing event to occur at four degrees of crankshaft rotation sooner than when at zero. There is an infinite amount of information on the Internet about how a camshaft works. But it reality, it isn’t that hard to understand. But, when it comes to camshafts, grasping that understanding is many times considered black magic. No matter what the situation, truer words have never been spoken.
Part IX: Timing is everything-Advancing or retarding the camshaft. So, if you’re thinking about upgrading your engine’s ignition timing with a rock-solid timing gear set, check out all the available options right now, at Summit Racing.Degreeing a Camshaft for your Small Block Chevyĭrag Race 101: Degreeing a Camshaft What’s Best for your Small Block Chevy
There are plenty of timing gear engine applications available, from the small block and big block Chevy (SBC and BBC), and Ford Windsor, to modern engines like the GM LS. And even if you’re not a fan of the noise, there are relatively quiet timing gear kits out there too. In fact, timing gear whine is right up there with a healthy exhaust cackle and lopey camshaft-music to a gearhead’s ears.
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And, as mentioned earlier, timing gear drive sets can handle a lot of stress, which is vital for something like a high-stress race or off-road motor.īut there’s another reason why a lot of folks upgrade to timing gears-with a signature whine, perhaps nothing tells the world that you’ve got a potent performance motor under your hood better than a timing gear set. They’ll also typically last a whole lot longer than chain drives too, ensuring that your timing will stay accurate even over long periods of time, which means you won’t have to go back in and make regular adjustments. Timing gears won’t stretch or break, mitigating variations in cam and ignition timing (and preventing catastrophic valve and piston damage in the process). That’s because a timing gear kit eliminates a lot of the issues associated with timing chains. And in a lot of cases, particularly if you’ve added a hot camshaft or upgraded your valvetrain with stiffer valve springs, a gear drive can be downright mandatory to ensure proper ignition timing under high-stress environments. Upgrading your engine with a timing gear set is a great way to ensure rock-solid, accurate, and reliable engine timing.
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