Originally Posted by zer099 (Post 3838279)

I'm not looking for trade secrets but generalized information without ambiguity or apparent speculation is more helpful to the community I would imagine. Helping a common guy plan a build is often vastly different then a race team trying to get their car ready for a season. The whole point of this forum, I thought, was for the common enthusiasts to share information and grow.

Originally Posted by zer099 (Post 3838305)

You're presuming no search was done. Search "broken crankshaft" and you get six returns, none about breaking a crank. One from 2016 where a guy directly asks about the limits of breaking the crankshaft and the one reply he gets is more focused on HP and a slight guess at RPMs. Try "broken crank" and you get about two pages, but only one useful thread (in regards to the question), sans this thread that now shows up in that inquiry. And that one thread doesn't actually state why, how, conditions, or anything of the like; just that a when they retired an engine it typically had a broken crank, and their rev limit was 8750. Same goes for "valve float". I spent the better part of my time searching these boars and the internet before commenting in this thread. The original question in this thread was about 8000. The necro-revival of this thread was about similar, and in either cases I found it doubtful it was about season tracking the car and living its life in the 8000+ range. To enter the conversation and tell people they need to worry about there crank can seem absurd. We have no evidence you need to worry about your crank in the low 8000s with the type of use the engine is most likely going to see. Valve float, maybe. Rod bolts? According to a reputable shop it is an issue. Oil pump, for sure, we all should know that (though dry sump is not the only answer or the correct one depending on the engine's use).

The data is not always out there sometimes. Sometimes you have to wear on people's nerves to get information that they themselves might think is out there.

Originally Posted by zer099 (Post 3838305)

You're presuming no search was done. Search "broken crankshaft" and you get six returns, none about breaking a crank. One from 2016 where a guy directly asks about the limits of breaking the crankshaft and the one reply he gets is more focused on HP and a slight guess at RPMs. Try "broken crank" and you get about two pages, but only one useful thread (in regards to the question), sans this thread that now shows up in that inquiry. And that one thread doesn't actually state why, how, conditions, or anything of the like; just that a when they retired an engine it typically had a broken crank, and their rev limit was 8750. Same goes for "valve float". I spent the better part of my time searching these boars and the internet before commenting in this thread. The original question in this thread was about 8000. The necro-revival of this thread was about similar, and in either cases I found it doubtful it was about season tracking the car and living its life in the 8000+ range. To enter the conversation and tell people they need to worry about there crank can seem absurd. We have no evidence you need to worry about your crank in the low 8000s with the type of use the engine is most likely going to see. Valve float, maybe. Rod bolts? According to a reputable shop it is an issue. Oil pump, for sure, we all should know that (though dry sump is not the only answer or the correct one depending on the engine's use).

The data is not always out there sometimes. Sometimes you have to wear on people's nerves to get information that they themselves might think is out there.

Originally Posted by Rusty (Post 3838402)

What it comes down to is this with stock crank and 8K redline with a N/A motor.

DD, canyon play toy. Where you might see 8K maybe once a week. It will live.

Doing track days a couple times a year. It will live. But the number of track days you do increases. The life shortens.

Track toy. You are on borrowed time.

FI is a different story.

Originally Posted by husam2012 (Post 3998648)

It's so funny how people answer questions so aggressively when they don't have any actual experience with it.

I'm proud to say that I've finally done a ton of testing with street driven Z's and raised redlines. 7800-7900 on a completely stock motor that's beat on everyday and it hasn't had a single failure.

I also worked on 1slowZ's car and we revved that thing to 8700 every single day and for 60+ dyno runs (the rev limiter wasn't working as intended as I had it set to 8300 but it was revving higher. That car has JUN cams, stock VVEL and again, no valve float, no cracked crank, and no issues at all.


Cars with upgraded oil pump gears will do 8200 all day just fine, but keep in mind this is strictly for daily driven Zs and not a track car that sees all of it's mileage at WOT and redline.

Originally Posted by husam2012 (Post 3998648)

It's so funny how people answer questions so aggressively when they don't have any actual experience with it.

I'm proud to say that I've finally done a ton of testing with street driven Z's and raised redlines. 7800-7900 on a completely stock motor that's beat on everyday and it hasn't had a single failure.

I also worked on 1slowZ's car and we revved that thing to 8700 every single day and for 60+ dyno runs (the rev limiter wasn't working as intended as I had it set to 8300 but it was revving higher. That car has JUN cams, stock VVEL and again, no valve float, no cracked crank, and no issues at all.


Cars with upgraded oil pump gears will do 8200 all day just fine, but keep in mind this is strictly for daily driven Zs and not a track car that sees all of it's mileage at WOT and redline.

Originally Posted by SteveVQ (Post 3998759)

Didn't 1slowZs motor throw a rod a few months back and now he has a new Z? The one that popped was boosted but stock motor, right? I don't stay up to date with youtubers that much. But I remember a video about that happening.