Re: In The Market For Hydraulic Roller Valve Sprin
Having emersed myself in the minutiae of valve spring specs for the last several days, I have found several alternative sets from Crane, CompCams, Manley and others. There is only one question I need to ask the graybeard engine builders out there. The spring pressures are never given for your installed height (of course) or where half open is for your applicaiton. Spring rates are sometimes given, but seldom if ever are spring rates trully linear. So from that comes the question: If you take the spring pressures at the given heights and extrapolate a spring rate (this never agrees with given spring rate, NSS) and assume the rate is linear to determine the seat pressure at your installed height and your open height and, as long as the given max. lift before coil bind is less than your cam's max. lift, can you assume you are going to be OK? (Of course, you've selected a spring with an OD less than or equal to your spring seat diameter ;-)
I am not EVEN going to go into two springs with two non-linear spring rates and don't even ask about triple springs. I haven't done integrals since I graduated college.
NSS = the question always asked of Sherlock.