If you decrease the amount of (hot) valve lash, for example, the valve will open slightly sooner, lift higher and close later. This makes the camshaft look bigger to the engine, because of a slight increase of actual running duration and lift. If you increase the amount of (hot) lash the opposite occurs. The valve will open later, lift less, and close sooner.
This shows the engine a smaller cam with slightly less actual running duration and lift. You can use this method on a trial basis to see what the engine responds to and keep the setting that works the best. Just remember, the more lash you run, the noisier the valve train will be. If the clearance is excessive it can be harsh on the other valve train components.
Therefore, for prolonged running of the engine Crane Cams does not recommend increasing the amount of hot lash by more than +.004″ from the recommended setting. And they do not recommend decreasing the hot lash by more than -.008″
– Tip courtesy of Crane Cams
Engine Builder Staff
Latest posts by Engine Builder Staff (see all)
- VP Racing Fuels Octanium Octane Booster - Apr 28, 2015
- Jamie McMurray’s Crew Chief Matt McCall Named MOOG ‘Problem Solver’ at Richmond - Apr 28, 2015
- EngineQuest 2015 Parts Catalog - Apr 24, 2015