I have heard that the stock z6/y8 valve springs and retainers can hold up to 7600 rpm (maybe more im not sure though). Also the fuel cutoff for a z6 is at 7600 so it only seems logically that the springs and retainers can handle that. Question is though, would I be able to run a stock z6 valvetrain with a zex 59300 cam and be able to rev up to atleast 7600?

 

If you are not making power up that high, why would you want to? It seems as if you want to just drop it in and rev away. No tuning, no nothing. Shift at redline if you want to rev high, no higher than that.

 

I didn't say I was gonna drop in the cam with no tuning or anything, I just want to know how high of an rpm the stock valvetrain will hold. Whats the use in gettin upgraded valve springs and retainers if the stock ones can hold just fine?

 

Anyone know how high of rpm the stock valvetrain on a z6 can handle?

 

u will only make power up to 7200 rpm, after that your just making noise, and u can use the stock springs and retainers with that cam, just dont rev any higher than that.

 

a.. i heard the zex cam makes power past 7200 not sure with stock vavle springs thoguh... i have a zex cam.. not in yet... cuz i am goign to due it the RIGHT way nd buy some valve sprigns and reatiners..... just for my peace of mind.

 

thats what i heard too. some people have dynoed the 59300 cam and said that at 7200 the power doesnt look to drop off anytime soon. ive also heard that the stock valvetrain on the z6 holds fine up until 7600 where the fuel cutoff is, but this is all things i have heard not known first hand, so i could be wrong.

 

Ok, BauleyCivic told me that the z6 valvetrain can hold 7600 rpm just fine. What id like to know now is, has anyone used an aftermarket cam stage 1 or 2 with the stock valvetrain and reved past the stock 7200 rpm? Also how long have you had the setup in your car and how often to you rev it that high?

 

You should use stiffer springs with the aftermarket cam. If you look at the paperwork that came with the 59300 it says that aftermarket valve springs are required.

 

I have heard plenty of people on d-series.org and H-T that have used the zex 59300 cam on a completely stock valvetrain without problems. Some of them have even reved up to the high 7000, low 8000 rpm range atleast 20 times or so and still no problems. I think people underestimate the strength of the stock z6 springs and retainers and assume that if a company tells you to do something you should automatically do it. I don't think upgrading your valvetrain for a stage 1 or 2 aftermarket cam is really necessary. True your valvetrain probably won't last as long as it would with the stock camshaft, but I don't think it will blow up after 500 miles either. In fact, some of the people reving past the stock redline have been doing so for a good 8000 miles.

 

Thats funny my z6 fuel cutoff is a t 7200. But on my VAFC it says like 7300, but that is no where near 7600.

 

Back from the dead....

Anyone have thoughts on what the Zex valve springs in the z6 can handle rev wise?

Also... thoughts on using the springs with stock retainers and stock camshaft?

Thinking about getting these from a local guy just so I can rev out my sohc-T setup if it shows that it wants to rev higher. Also as protection from possible overrevs... this motor is being beefed up against random stuff like that... its for a daily driver.

 

well just put it this way...how many guys have floated a valve on a single cam....but yeah has anybody had trouble in reving too high in a d16? in any setup