Valve Springs
- Thread starter greg51
- Start date
JesusTheAgnostic
New member
BNR sells them, they were on sale when they first came out. The website says it revs past 7k or something like that. Pretty cool, not sure if anybody on the forums has reviewed them though. If I rebuild my engine with forged pistons I'll get the springs too and let you know. Might be a while though :/
What are you thinking about?
Valvetrain measurably accounts for a % of mechanical losses, adding more spring will add to the losses, in addition to increasing stress on the cam lobs, followers, lash adjusters, valve stem, locks, retainer. The springs themselves are more stressed, so there will be a correlated impact on fatigue life. The small risk is breaking a spring, dropping a valve and damaging your piston/block/head; which is usually worth the risk for high power engines pushing the limits.
Are you 100% certain you're going to be revving the daylights out of this? Do you have an aftermarket turbo?
Tesseract_Indeed
New member
I also am wondering about the BNR Valve springs. My sonic jhas 152,000 miles on it and I suspect that after that might time, and now that I am starting to do performance mods (Bought it with 140k miles), the valves could starting to float. And, by rebuilding and replacing parts that can go bad by revving the piss out of it, it is nice to know that it would hold up. I am honestly scared to redline or hit the rev-limiter because of how many miles it has...any one else got thoughts on it? Should I be fine?
zomby woof
Member
150k on a modern engine, if reasonably maintained is not a lot.
Stock valve springs are fine and you will not see float at or above redline even running higher than stock boost.
Big Turbo Sonic
Member
This is true. There are people running 6,900 rpm at 26 psi.