#### Doorkicker

##### Well-Known Member

For argument sake let's assume my piston to valve clearance is 0.000. Let's assume my intake valve is 2.02 and I'm changing to a new head that is 2.19. The valve angle is 15°.

Is the following calc correct...

Change in valve diameter is 2.19-2.02=0.170, therefore the delta from center is 0.085 (aka change in radius). To calculate change in depth (added distance to piston) take SIN of 15°=0.2588. Therefore, 0.085*0.2588=0.022. so if the starting clearance is 0.000 the new clearance would be -0.022.

Correct or...what did I miss?

Keep in mind I'm just trying to confirm the math. Clearly, I need more clearance to address heat expansion and I don't have zero clearance now, of course. I'm just trying to confirm the use of SIN in the relative calculation to the angle in the change of the valve size.

Thanks in advance.