Valve Brow reliefs

Craig · Post by **Craig** » Mon Jan 03, 2005 10:01 pm

What are the trends these days for radiusing the edge of the valve brows in pistons? Can you put too large a radius in, should it be large, or small???

idunno · Post by **idunno** » Wed Jan 05, 2005 4:35 pm

the answer will change from variables in piston to valve clearance.The closer the p/v clearance ,the more the radius will help the int. charge.I would not do it at all on the ex. side.I may have gone over the deep end on my engines but I would first check my p/v clearance then take the piston out and set the valve on it with the clearance (using valve spring shims under the valve between the piston) then scribe a line on the piston and radius the pocket above it. If the eng had so much there was nothing to scribe it will not be beneficial.