At high rpm, the inertia of the whole system going over the nose fights the return spring force, and the lifter wants to hang in the air instead of following the cam design. Over the nose at max lift, the valvetrain is fully compressed and fighting to rebound against the force imparted on it. As you run up the ramp to the nose, the valve is opening farther, the parts are compressing more, and the dynamic loads are getting higher. The lobe design has to be quick yet smooth so you don't transfer any bad harmonics into the system, which will cause spring surge and destroy them.

During the initial opening of the valve, the lifters, pushrods, rockers, and valvesprings are compressed into action. The problem is that the weight of all the parts, the elasticity of the components, and the effects of the springs all work against the cam motion at high rpm. The goal is to have the valve motion be the same as the designed cam motion. You must design the entire valvetrain to work as a single system. The better the testing and manufacturing, the better the product.'Ĭamshaft design is all about valvetrain inertia as a whole. Each new breakthrough is an evolution, and the more data you have, the clearer the path becomes to your goal. I think everything we do is based on past design limitations and the attempt to push each part to the limit or next level. 'When we combine our Spintron, computer simulators, and dyno testing with our Accu-Cam precision profile measurements, accuracy standards, and feedback from engine builders, we know we have accurate data we can depend on.

We believe better and more accurate cam and master grinding machines in addition to better information gathering and testing technology helps us push development forward at faster and faster rates,' says Jamora. 'Ed has always believed in acquiring new technology to push forward. Naturally, these advancements mean the camshafts of today are far superior to the ones available decades ago. Over the years, the equipment available to cam manufacturers has changed dramatically, evolving from simple cylindrical grinders to Spintrons and Notron grinders.

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