max rpm's on stock bottom end
 

as the title says what is the max rpm to be revved on the stock internals until they give up??

my 05 8 has stock internals with a tbe and intake with intercooler piping(doesnt effect the rpms whatsoever, jsut thought id throw that in) and my redline will cap off at 7700rpms.

yeah i know where the rev limit is i guess what i mean is if i had a head that would flow in the upper 8k and above range would the stock bottom hold up? and where is its limit?

Im sure its a possibility, but I would not try it. If youre planning on doing that why dont you at least get some valvesprings and retainers? They're not that expensive and they will give you that added safety.

i have seen some tuned cars that run to 8000 on a stock bottom

Yes bottom end is actually good for 10000rpms. Now the head will be in question and IMO I think it will be good for 9000 but no more than that and 9000is pushing it. I woudl say 8500 for safety. Now if you had a built head I would say 10000. Your block wouldnt be questionable it would be your head.

10k Rpm,s On Stock Bottom End. I Dont Think So Even With Head And Valvetrain Upgrades

Probally 9k or so

Stock bottom end good for 10k? Rrrrrrrrrrrright.

For the sake of your motor and wallet, don't take it much past 7800.

rod bolt is the weakness of the stock bottom. don't raise more than 8k!

your fine to take it to about 8400 rpms

after that, upgrade your valves and rods

no reason to raise the rpm up that high if you aren't going to make power up there. you would need lots of head work to take advantage of the high rpm.

+1.

Rod bolts are arguably more important than rods at that point, although you are pushing stock rods quite a bit at 8400 anyway. Why would you upgrade your valves at 8400? Those have nothing to do with how many RPM you can support.

Many of the guys with aftermarket turbos are pushing the stock motor to 8k, some even to 8.5k w/o issues. That's not to say that it is SAFE. Stick with <8k if you don't want to compromise reliability.

OMG could ONE of you peeps at least give some FACTS about why this or why that? So far it's 10K, 8.5K, someone said don't go past 7800 (that's what they said about sound barrier too ;), someone started talking about the head...when it's the bottom end that is the question....yadda, yadda, yadda...

With the amound of BS floating around here from young'ins *KNOWING* they must be right - give some freaken FACTS please!

If you have hearsay or have never tried it yourself, or don't live and breath these engines (and at least qualify yourself) then pipe down please.

For instance I would qualify my knowledge that the SR20DE bottom end can go past 8K rpm because I've done it (yeah, big deal), crank is balanced/counterweighted, cross bracing on bottom of block, windage tray for oil, etc - little doodads that make it happen.

I really would like to know if I can do 8K rpm on the stock block, for less than 60 seconds, after upgrading the head with the right bits - on the 06.