Newbie Spring Questions
Newbie Spring Questions I have two quick questions, do my valvesprings (918s) need to be broken in or can I install it and beat on it right way? Also do I need to shim the springs with my cam? I bought it from a member on this site, it's 224/224 at .050 with .581/.581 on a 114 LSA. I belive it is an XE-R lobed cam shaft. Thanks for the help in advance.
Its standard practice to heat cycle the springs a couple of times from cold to fully warm. Some say this is unnecessary, but better safe than sorry. Also, no Shims necessary.
Originally Posted by GuitsBoy
Its standard practice to heat cycle the springs a couple of times from cold to fully warm. Some say this is unnecessary, but better safe than sorry. Also, no Shims necessary.
Don't forget he means at low RPMs and no load (Don't drive it).
Here's what I did. I finished the job up in the evening, and ran the motor for 20 minutes idling in the driveway, looking for leaks. The next day, I started it again, and after it hit 210, i looked for leaks, took it around the block at normal driving speeds, shifting at 2500. Parked it and looked for leaks again. Later that night (after it cooled down) I took it out and took it up to maybe 4K to get a feel for things. Let it cool down. Next morning took it to work and laced into it a dozen times 
Id heat cycle it once at idle, then progressively drive her harder each time you take it out over the next 2 or 3 days.
Id heat cycle it once at idle, then progressively drive her harder each time you take it out over the next 2 or 3 days.
