First off all, that link you sent me is for the Subaru FA/FB engine. That's a Subaru designed engine with Toyota's D4-S injection when it's in the BRZ or GR86. The engine architecture and design is all Subaru, but of course Toyota has some input on performance numbers. Toyota said, hey Subaru, we'll give you some money if you make this engine for us with these specifications for our sportscar. And Subaru was like, sure thing boss! That's it. The G16E-GTS and the FA/FB literally have NOTHING in common. Quite literally nothing in common besides being engines. They are not even made in the same factory. They are not made in a Toyota factory. They are made in a Subaru factory.I’ll add one thing; there is a weakness in the valve train which can be rectified by the addition of rock arm clips from an Australian company. Denstoj Rocker Retainer Kit for FA and FB Subaru/Toyota Engine
This weakness has been discovered by this firm and they’ve developed a fix for what Toyota is aware of for the GR Yaris.
Look into them, I’ve spoken directly with the owner on several occasions. The problem is real and can cause a catastrophic failure of the engine. It has on several GR Yaris in their country, Europe and the UK, mainly from over-revving or money shifts. 👍🇺🇸
Did you mean this?
Denstoj Rocker Retainer Kit for G16E-GTS Toyota Engine (GR Yaris & GR
That's like saying an F22C engine(or any other engine for that matter) has weak head studs because stronger aftermarket ARP head studs are available for it. Presence of a stronger aftermarket part does not always mean said stock part is weak or prone to failure. In addition, that's the only company making these retainers. The GRY has been around for 3 years now. Do you not think that if there were widespread valve train problems that more companies would make these rocker retainer kits?
Furthermore, I tried to googled GR Yaris valve train failures and only one thing was non-money shift related. A tuner decided to raise the rev limit to 7600 RPM and the valve springs couldn't keep up. This can happen with literally ANY engine if you electronically and mechanically raise the rev limit without the associated valve train upgrades. In addition, bending valves and destroying rocker arms when you money shift is a thing that happens with ALL modern engines due to high compression pistons necessitating an interference design.
Our first failure! - Valve Springs
Another one I found was isolated to just this one thread.
So you see, I did some digging. The guy, Robert Mitchell, that posted this on Instagram(and found its way in to that forum) either owns(or works for) a rental car company for people that want to rent cars and drive them on the Nurburgring. That GR Yaris has thousands and thousands and thousand of hard miles being rented by people who just beat on it all day, day in, day out. That Apex GRY(as its called in that thread) destroyed its valve train initially due to a money shift. They obviously fixed it, but they grenaded the valve train again. Probably due to another money shift, or botched repair. I mean, beat on a car enough and it will eventually fail. Like any other car out there. Didn't GenRacer blow a head gasket on their VN TCR race car a while back? Does that mean that VN head gaskets are weak and prone to failure?
Here's the Gen Racer VN engine teardown video of the blown head gasket: Look through the comments and Dave Marino says the engine as only making around 300-ish horsepower.
Also, this video has Robert Mitchell admit he money shifted his GR Yaris.
There's someone on the r/velosterN subreddit that posts about money shifting at least once every 2 weeks. As a matter of fact, I have read more threads about money shifting with the Veloster N than any other car community I've been a part of. I swear, it's an epidemic. But I don't see or hear anyone saying the Theta II-i has a weak valve train because of that.
None of what you said points to the valve train being a weakness of the G16E-GTS engine or flawed in design, simply because people decided to do something they probably shouldn't have done, or screwed up a shift. In stock form, the G16E-GTS is incredibly reliable. Start tinkering and you risk catastrophic failure. Shift like Vin Diesel and you risk catastrophic money shifts. Just like any other engine out there.
So really, there's one instance of a GRY valve train failing that isn't due to a money shift. And that's because they raised the rev limit. Every other valve train failure on the GRY is due to money shifting. So please, stop spreading misinformation and blowing this out of proportion. I did my due diligence. I tried to prove you right and myself wrong here. I presented links and did some digging. A lot of digging. None of what you say is true. What you are saying, and have been saying about the GRY/C engine is just plain wrong. The absolute truth is that if you money shift or over rev ANY engine, it will blow up. This is not isolated to a specific engine. This can happen to ANYONE. There are no protections against mechanical over rev. None. That doesn't make it a weakness or design flaw. It's user error and/or abuse. Plain and simple.