Thread: SR22VET SR16VE N1 cams problem

Are you using stock valves or was there headwork done such as aftermarket valves and so on?
The only ones ive seen have issues are the ones with valve work done and not everybody has issues that has aftermarket valves. So its got to come down to the shimming being incorrect. I dont see any other way around it.

I never had one single problem with mine, 9800 all day long and then a blast to 10,200 on one run. Had other issues from that much revs but nothing in the head.

Maybe get the 130lb springs and reshim and make 100% sure its correct. Ive seen worse things than popped shims happen from incorrectly shimmed ve heads. Shattered and broken rocker arms and so on.

When i said larger turbo i meant a larger turbine housing, not necessarily the compressor side. Get the largest turbine housing you can get for that turbo.

Maybe a problem with piston to valve clearance? You said your running bigger valves right? Are these oem shims? maybe try to use the stock VE retainers since your only going to 8k and set a soft revlimiter.

I also tried reshimming my valves but it would I always pop one. It would be also random valves that would pop.

That is weird. With my all motor set up. Ive never had a shim come misplaced. This was other three diff heads, one with aftermarket valves. This is all just shy of 10krpm. Im really curious whats causing the problems

Maybe the valves are to tight in the guides causing them to bind up when it gets hot.

I spit out a shim once but that was because the throttle screw got sucked into the motor. That was the only time tho.

^ I have seen this happen as well. The only time I had a shim come out was after first putting the motor back together and was rotating it by hand. I have not had a shim come out since. The rev limit is set to 8500rpm with a 8300rpm soft cut. I have p12 20v cams with crower springs and retainers.

Yeah it is not normal to spit shims out. I understand some people have had bad luck with it but something is causing the issue. Like it was said, maybe the valve is hanging up in the guide or something like that. Especially if new brass guides were installed in the head there is a good chance. My buddies F20 head did the same thing. Valve got hung up in the guide and it ended up costing him the motor as valve came in contact with the piston. Supertech brass guides as well.

I really think there is more to the whole thing. Every ve motor ive done has never had issues all of which are revving over 9k.

It only takes a minor scratch on the valve stem to cause the valve to bind and have the shim pop out.

I wrote already my setup, the BC springs now around 130lb, valves are supertech.
My GTX3076R turbine house is T4 1.06A/R divided, and big tubular twin scroll manifold, twin wastegate. Now it is very good for drift with low boost too, but I want to rise the boost and RPM limit.