Table of Contents
What is proper valve lash?
Simply use a feeler gauge and slide the tab of the correct thickness between the tip of the valve stem and the end of the rocker. The camshaft manufacturer or your engine builder will give you the preferred lash range-it’s usually between 0.010- and 0.024-inch for a race engine.
What is used to measure valve guides?
The valve and valve guide are checked with a micrometer or comparator. A ball gauge is used to measure the top, center, and bottom of the valve guide for measuring with a micrometer. The diameter of the valve stem is also measured and recorded.
What happens if you set valve lash too tight?
Broken lifters and burnt pushrod tips are often consequences of too much valve lash. If the lash is too tight, the intake valve may hang open. Some engines have the valve-lash adjustment on the pushrod, like this early Hemi. “You can also burn a valve if it’s not fully seated,” adds Godbold.
What tool is used to measure valves?
In order to measure the valve lift and velocity, typically a Laser Doppler Vibrometer (LDV) is used.
What’s the best way to set a valve lash?
There is no magic formula to setting valve lash on solid-lifter camshafts. Every engine will like something different. The best way to set the lash is to set one cylinder at a time. To set proper valve lash requires that each lifter be on the base circle of the camshaft to ensure the valve is completely closed when you adjust the rocker arm.
What does it mean to adjust the Lash on an exhaust valve?
Using the EO/IC method of adjusting lash is the best way to accomplish the task. EO/IC stands for exhaust opening/intake closing. When the exhaust valve starts to open, adjust the lash on that cylinder’s intake valve.
Do you need to adjust the Lash on a camshaft?
To the uneducated, adjusting the valve lash of a solid-lifter camshaft seems like an unsophisticated task of simple maintenance. But, there is a lot of information—and power, to be gained by paying attention to the lashing of your valves.
What is the Lash on a pushrod engine?
Valve lash is the mechanical clearance in the valvetrain from the valve tip to the rocker in a pushrod engine using solid lifters. Watch as COMP Cams explain how to make lash valve adjustments with the proper tools. http://www.summitracing.com/redirect?…