With Old fashion guages that measure the normal size of the run and then the rise of the lobe.
It is a measure, in thousandths, of how far the cam lobe lifts the valve open, off of the seat.
That is called the lift
the valve oerlop increase
Lobe lift refers to the vertical movement or displacement of the lobes in a camshaft, which are responsible for controlling the timing and duration of the engine's valve openings. It plays a crucial role in determining an engine's performance characteristics, such as power output and efficiency. Variations in lobe lift can affect how aggressively an engine breathes, influencing factors like torque and horsepower across different RPM ranges. Adjusting lobe lift is a common modification in performance tuning to optimize engine performance.
Indy cars do not use camshafts. They use electric solenids to open and close the valves.
there should be a number stamped on the front of the camshaft. provided you know the manufactorer, go to their website, type the number in and you will see whats called a Cam Spec Card with all duration, lift, and lobe seperation.
there should be a number stamped on the front of the camshaft. provided you know the manufactorer, go to their website, type the number in and you will see whats called a Cam Spec Card with all duration, lift, and lobe seperation.
A cam lobe, is an eccentric. The heel of the lobe, would be the non active, flat part of the lobe. Non active, as it is the non active portion, of the cycle.
The two most common ways to measure cam lobe wear are by using a dial indicator to assess the lift and contour of the cam lobe and by employing a micrometer to measure the lobe's diameter at various points. The dial indicator provides precise readings of any wear or deformation in the lobe's profile, while the micrometer allows for exact measurements of thickness to determine material loss. Both methods help in evaluating the extent of wear and the need for maintenance or replacement.
New camshaft, they are machined whole so there are no parts that you can replace
The rocker arm ratio (whether they be stock or roller rockers) has to do with the offset of the rocker fulcrum. The stock rocker ratio on the small block Chevy is 1.5:1. This is important because it effects your valve lift. For example, a camshaft with .300 lobe lift will yield a .450 valve lift with the stock 1.5 ratio rockers. Multiply the lobe lift times the rocker ratio to get your valve lift. Now, that same camshaft will yield .480 lift with a 1.6 ratio rocker arm and .510 lift with a 1.7 ratio rocker arm. More lift is good as long as your valve springs can handle the extra lift and you don't run into valve/piston interference problems. You are more likely to run into coil bind with the valve springs than an interference problem though. When in doubt, make sure to check just to make sure there will be no problems.
look on the internet you fool.