Broke a 918....Need Valve Spring Recommendations
#1
Broke a 918....Need Valve Spring Recommendations
I'm running a BRE cam spec'ed at 23X/24X and .59X"/.59X" with Comp 918s and one snapped yesterday at idle. The top coil broke in two places. Thankfully, the valve did not drop into the cylinder. Needless to say, I'm looking for a new set of springs to handle this cam reliably. What has everyone had luck with when running fast ramp rates and high lift? I'll be running the engine up to 6500 RPM.
#5
Thats what I am running. Very good springs and able to control agressive cam profiles.
#6
PAC 1518's are good for 0.650 @ 1.80(I think that's right). My understanding is that they used to make the 918's for Comp until Comp went somewhere else for them.....and guess what.....that's when Comp started snapping springs left and right.
Last edited by ACE1252; 08-24-2008 at 03:49 PM.
#7
#9
Approximately when did comp stop using these guys? I have the comp 918s (bought ~2 years ago). Should I be worried about spring failure?
#12
#15
To eliminate any mistakes I may have made in this process, I double checked the installed height on the springs and made sure that the rocker wear mark was in the center of the valve. Everything checked out. These springs are spec'ed to handle the cam I am using and the engine has not been taken to redline even once. I can't see any other root cause besides bad hardware.