View attachment 1715536568
By
Engine Builder
on
Aug 19, 2011
Engine respond to the actual movement of the valves. Since the valve cannot move until all the running clearance (valve lash) has been taken up, the amount of valve lash you use affects the engine’s performance.
The alloys of certain engine parts can be affected by thermal expansion in different ways, therefore the amount of correction factor to the lash setting depends on whether the cylinder heads and block is made out of cast iron or aluminum.
You can take the “hot” setting given to you in your cam manufacturer’s catalog or cam specification card and alter it by the following amount to get a “cold” lash setting:
• Iron Block Iron Heads – Add .002?
• Iron Block Aluminum Heads – Subtract .006?
• Aluminum Block Aluminum Heads – Subtract .012?
Compensating for a Cold Engine When Adjusting Mechanical Lifter Valve Lash
