I'm curious to hear from others revving past 9000.

My setup is an 83mm b16, sleeved block, pauter rods, z10 girdle, s366.
Head will have ferrea 6000 valves, supertech 85# springs, itr cams. It had rev valves and springs and at 9500 I had valve to valve contact. Obviously it was down on power on that pull but the pull on 24# before this happened, we only pulled to 9000 and it was still making power. It's a track car so I'm not afraid to turn it to 10k if it's making power that high, assuming it's going to stay together. The only reason I can see how the valves hit are from valve float, which is why I'm replacing the springs. Just curious to hear from others revving high with success.

 

What i was always told is that as long as its still making power, you should be fine. I personally rev my car to 9500. My car is mostly street driven. I know that more of the mainly just drag racing cars rev higher, but theyll have to chime in on that.

 

Supertech 85# springs in motor revving to 10k+ with no issues

 

What cams are you running? Did you check v2v clearence? What size valves ? I'm currently running GSC valves and cams with supertech 85lb springs to 10k rpm
No issues.

 

Just itr cams. Std size valves. I didn't check any clearances since I bought the long block assembled. I didn't figure itr cams were big enough to cause an issue. Only two valves had contact.

Yeah I don't plan to rev higher than it makes power but like I said, at 9k on 24# it was still climbing. I plan to go up to around 35# if the turbo will make it so as long as it doesn't hit a restriction I figure it will make power til 9500 or more. I just don't want to keep damaging valves. I won't rev it that high if it's going to be an issue. I'm not trying to break records or anything. Afterall it's just a b16. I'm just running the car for fun.

I'm hoping since I bought the motor assembled that someone made a mistake, or that the rev valves just weren't good enough, even though I've heard they're the same as supertech. I'm also adding a vibrant tensioner since the belt flopped around a lot at high rpms. It may or may not help, but I felt it was cheap insurance.

 

Dsport did a similar build a few years back, with the same rod and blox type A cams. i can remember the valves or spring off the top of my head but their whole reason for using a b16 was the lower piston mean speed. which means less likely to fail at higher rpm. they were going to 10,500rpm. i know a few of the top guys like Locash and Indub are were going to like 11,500rpm in gsr blocks with turbo tuffs.

 

Yeah I know the b16 has a much better rod to stroke ratio. I'm honestly not worried about the bottom end. I'm more concerned with bending a valve again lol. Something I noticed was that the rev valves I had have a slightly larger face than the ferreas. I almost feel like the ferreas wouldn't have hit like the revs did. The contact mark was so tiny that the small difference in face diameter would have probably prevented it.

 

The guys that did that Dsport build used kibblewhite valves and port flow springs and retainers

 

Supertech 85lb springs should be plenty for you.