Destruction?! Inside the Blown Toyota GR Yaris Engine

[@titusvarughese5071]

Stick to driving automatic lol

[@RobertMitchell]

Stick to Twitter

[@ludda42]

It happens man. Drive enough and it happens

[@Tristan.R.J.M]

@@RobertMitchell 📣-📣-📣- 📣!!!

[@titusvarughese5071]

@@RobertMitchell 😝😝

[@paulomoniz7326]

Not really.

[@MrHaun]

April? C'mon now, overnight parts from Japan. That's the Tier 1 solution.

[@RobertMitchell]

I don't want to flex too hard, ya know?

[@sooofancier]

@@RobertMitchell Are you planning April Fools day Robert?? Hmmmm you are suspicous...

[@DiscoR53]

You can’t rush quality.

[@alexandrepf8471]

Overnight parts from litchfield

[@doctorscoot]

Given this is a homologation model, I would have thought spare engines would have been available for racing teams? Maybe you have to order the spare engine when you buy it.

[@matthewmahy2604]

Fascinating to see the insides of the engine on such a new car, and great to have a dealer that lets you get in and see the work in progress like that. Love these technical videos, please keep them coming.

[@RobertMitchell]

Couldn't agree more! The guys at the dealer are really cool and I can't thank them enough for letting me make this video for you guys :-)

[@jorgschneider4907]

@@RobertMitchell I rebuilded my old Celica gt4 for Weeks at their garage. They are very helpful and Michael is a great Chief. Bekim and Waldemar are my tier 1 mecanics!

[@gergoantal1066]

@@jorgschneider4907 I love the Celica GT-FOUR

[@dimsoneill]

@@jorgschneider4907 My friend’s Dad got a Gt-4 when they first came out. Will never forget my first drive in that! Great car.

[@SparrowNoblePoland]

What car makers won't tell you that power output relative to engine capacity in modern turbocharged engines is such as it was it group IV (highest competition class) cars in the early 80s, while materials remained the same. In most cases, no magnesium, no titanium, no ceramic alloys, just iron, steel and aluminium. Back then these engines were supposed to do 3-5 thousand kilometers before a complete rebuilt. These modern engines are effectively competition engines and owners should have over-average technical knowledge if he doesn't want to damage then in no time.

[@tomstamp]

Have you tried turning it on and off again?

[@john-martin]

That wouldn’t help because the rocker actually fell off the bearing, nice thinking though.

[@tonycarpaccio9550]

@@john-martin whoosh?

[@makesense1607]

@@john-martin It was a joke.

[@xthilox]

Or maybe Robert had just no fuel .. i would have checked that before open the engine 🤷🏽‍♂️ 😂

[@RobertMitchell]

Good idea let's try that tomorrow! ;-)

[@mgcharoudin]

Dead Head Redemption!

[@TheMilenkata]

Hahah, that was good

[@lewistheberzerker]

🤣🤣🤣🤣🤣🤣🤣🤣

[@theraggededgeonboardfastes8461]

The curse of JWW ??

[@nunyabinis]

Hopefully an Apex Yaris tie dye sticker is coming soon!

[@rustler08]

Why not Head Dead Redemption?

[@tjones002]

As a mechanic, I absolutely LOVE how apparent it is that Robert has wrenched and built engines himself. Also, how awesome of the Toyota dealer to let you film this in there!

[@HardcoreMotors]

Good thing you pointed out the engine. I thought it was a coffee machine.

[@RobertMitchell]

It's crazy how small this motor is!

[@playwme3]

Triple boilers with a Milk Frother hanging off the side.

[@Mistabushi]

I like how the host counted cylinders, one two three, I can confirn there should be three cylinders in this particular engine

[@Dan23_7]

@@Mistabushi I thought the same 😂 We’d still be listening if it had say 12 cyls

[@Mistabushi]

@@Dan23_7 damn right haha

[@KirkVSSpock]

You're a nice and honest guy Robert. Without saying anything, with no warning from the computer, the cost would have been fully taken on warranty, come on Toyota, give Robert a discount ! Loyalty pays, this would be a great example.

[@vornamenachname9080]

I agree but usually by using cars on track you loose warranty anyway, but yes it would be nice if they would share the costs, the rocker arm shouldn´t have failed at such a small overrev, i think this was a material issue anyway. I did the same with an BMW 430i at the german Autobahn, wanted to shift to 4th at around 130kph and accidently choosed the 2nd but luckily nothing happened my first ever missshift :D intersting how many lights can flash at the same time in a modern car cockpit and the engine turned off immediately automatically :D:D but tbh it was the only way i ever found to switch off the ESP System. Because i was still roling and restarted the engine there was an ESP-failure which took it off :D:D but I wouldn´t recommend this.

[@KirkVSSpock]

@@vornamenachname9080 Nurburgring is NOT considered as a track in Germany ;-)

[@vornamenachname9080]

@@KirkVSSpock 😅 just waited for this answer, this could be a nice meeting at the court. Customer: it is a legal road not a track! Tyota: okay so, why you are going 200+ on legal Road where 100 is allowed, maybe we should talk about your mental ability to drive a car on public roads. Customer: okay, how much is the engine:D

[@ddmk11]

I enjoyed watching this with my son who is seven he found it fascinating .....Thanks.

[@RobertMitchell]

Greetings to you son David!

[@6pistons]

We get to see the engine partially disassembled, real cool.

[@RobertMitchell]

Hey Marlin, glad we managed to get down to Toyota to show you the engine whilst it was in pieces! Thanks for watching :-)

[@DanijelTurina973]

I'm far from being an expert, but if the ICU doesn't show over-rev, it would indicate that the engine remained within manufacturer spec, and the actual cause of the breakdown was a manufacturing defect inside one of the bearings, which might have been revealed through a slight over-rev, but then again, it might have just failed after a heat-cycle. In any case, I think Toyota should think about covering the expenses.

[@jmblur]

Agreed! If it was still within spec enough that the ECU didn't log it, it sounds like the overrev was minimal and possibly still within red line. Of course, I'm not sure Robert cares so much about the cost of the repair on a Yaris compared to a lot of the other cars in the fleet, the downtime is a lot more costly than the repair. I appreciate Robert's honesty but this is definitely a situation where a causal omission would have gone a long way. That said... Misery means clicks, so he probably will earn more money admitting it than not!

[@ArKritz84]

It's an interesting problem. Whether there is enough data logged to get a meaningful sequence of events out of it, whether the parts can be X-rayed or microscoped to expose a potential weakness etc. Maybe get Toyota interested and ship the damaged parts to Japan? In retrospect, as long as there is no overrev logged, it *would* have been a warranty job.

[@kreiseltower]

I think the cause might be not even the over-rev per se but the over acceleration of the affected parts. Just to put in some numbers going from 2000 rpm to 7000 rpm in 5 milliseconds might be ok for the bearings and lubrication... and springs... but going from 2000 rpm to 7000 rpm in 0,5 milliseconds might cause damage like ejecting a retainer pin although the engine isn't really overreved.

[@kain0m]

@@kreiseltower na, accelerations isn't an issue for the rockers. At 7000 RPM, the cams are rotating almost 60 times per second. So the rockers are going up and down every 20ms. Acceleration of the engine wouldainly hurt the transmission, and maybe the timing chains, but not throw a rocker off.

[@kreiseltower]

@@kain0m I do not mean acceleration of the car, but angular acceleration of that bearing where the rockers sit on etc... I don't remember exactly, but how does that axle of the rocker mount sit on that bearing? Is it a press fit? There must be a (design) limit on how fast you can accelerate or decellarate from one rev. number to another and this could have been the failing point.

[@geek9642]

Just a thought you could ask Toyota to fix it for free and pay you £25k for the privilege, then get a commission on future sales.

[@RobertMitchell]

On it

[@matmul4850]

New drinking game. Every time Robert says "Ultimately" take a shot. 😁 Guaranteed you’ll be drunk very quickly 😅

[@RobertMitchell]

Let’s do it

[@robertdaniels9460]

Haha this is the only reason I’m in the comments as I found it funny too 😂

[@salsarriba5695]

cany anybdy bssay, how thisd vdeoi ended?

[@mayuravirus6134]

A shot of what!? Vodka!? Whiskey!?

[@fredzephire4071]

@@salsarriba5695 lol

[@I999-g2s]

‘Ultimately’ one of the more cool videos you guys have made - thank you, really learned a few things from this whole story. Narrowly missed a “money shift” myself on my gt3, boy am I glad!

[@RobertMitchell]

Man I’m glad you didn’t buzz the GT3!!!

[@I999-g2s]

@@RobertMitchell I was incredibly lucky, I shifted to 2nd and began to release the clutch when I saw "2" on the dash in front of me and 'clocked' that wasn't what I wanted to do, I had hardly released the clutch by a few millimeters. The 991.2 shift is incredibly close across the gate.

[@RennieAsh]

Isn’t it difficult to put it in such a low gear at speed or are synchros very good these days?

[@I999-g2s]

@@RennieAsh perhaps it was the 'resistance' that I felt that made me aware of the mistake I was about to make, but I'm pretty sure it would have made the shift. Certainly, there are others who have made a similar mistake (with disastrous consequences). I find the manual box in the GT3 to be a bit too easy to shift (little resistance as compared to say my old 997), couple this with the short throw and very closely stacked ratios, and it's almost a recipe for disaster (certainly for hacks like me).

[@RennieAsh]

I999 I don’t like changing gears overly quickly because of such things lol. I don’t race though so it doesn’t matter :)

[@TheDrAkira]

Those cylinder walls are THICK! Thanks for showing us this little beast!

[@raymondk2202]

short term heat absorption/capacity

[@SebastianBlix]

I was just thinking that! Open deck was a surprise, but those walls are thicc

[@jrchismorie]

Today on Engineering Explained... great stuff Robert!

[@RobertMitchell]

Thanks for the support! Glad that you enjoyed the video :-)

[@Runoratsu]

Missing a whiteboard for being EE! 😄

[@Gabriel83580]

For those of us who have a interest in this engine and it's engineering, we find this video very educational and give us a small idea of what to keep a eye out for,when it comes to high Rev. The fact that you showed us the physical part's while explaining the damage results and your plan for the rebuild got my attention being that this engine is becoming more popular in the automotive and car world. So thank you.

[@1rayljr]

Admire Robert for the honesty and taking responsibility for the damage. Time will tell if the over-rev was actually severe enough to cause the problem, or if we will see similar failures in other GR Yaris in the future. I do find it a bit interesting that only the one rocker arm bearing was damaged from the over-rev.

[@RobertMitchell]

Hey man thanks for the comment. Yes sometimes you just gotta be transparent with these things, things happen and we just have to overcome it. :-)

[@ddn79]

You know thats some tier 1 status if the dealership is letting you into the shop to video. Most if not all shops in the US will tell you to GTFO lol.

[@RobertMitchell]

They’ve been really good to us

[@ghostwrench2292]

I wrench at the third dealership of my career. I've never had a problem if a customer wishes to see their car when it's torn apart. I had a customer take pictures of their engine and then post those pictures on an enthusiast forum. That might be the extreme though (that was about 12 years ago), but I think if the customer just wants to look and ask questions of the technician they would first make sure the tech is OK with it first and then let him come in, especially if the customer is paying for the repair vs warranty.

[@Mewzyc]

I've been told is mainly due to the shops insurance. It's a liability

[@davidsmall7676]

Robert, very impressive Tech Talk. I enjoy the in depth sharings when dealing with fixing and improving the fleet. Thanks! Glad that the catastrophic failure was not a total catastrophe. Looking forward to the next part of the rebuild and a return to the Apex fleet for laps.

[@sids2498]

Robert first off, kudos for looking at the silver lining even through a bad experience. Second, I appreciate your taking the time to explain all of this to noobs like me. Much appreciated!

[@46M111]

So if it wasn't over revved how high was the peak rpm recorded in the ECU?

[@levisalvini4110]

I will love to know that too!

[@schmo7777]

He said like 13k rpm.... So, I'm guessing revved to like 9k and damaged but not destroyed? Think they ecu would record 2k over redline, and figured you need at least 2k over to damage and dismantle parts like here

[@doctorscoot]

Toyota engineering is pretty incredible at making their stuff compact, buildable, maintainable, and generally bulletproof. Lots of other makes tend to get only 3 out of 4 of those right (some less lol). That engine is a work of art.

[@OrionVX]

Tier 1 content! Inside look on a new engine, really inside :D

[@RobertMitchell]

We definitely don't do things by half on this channel haha ;-)

[@ArKritz84]

Really inside, but not really new. At least not anymore. 😂

[@mkkoper]

Well, technically it’s only half of the engine 😂

[@thelokoone1]

Thank you for taking time to make an informative video out of this misshapening Robert. It was pretty cool to see that little beast engine with so much detail

[@andywong5606]

Thank you for sharing the progress of your GR Yaris motor. Your failure analysis skills are pretty good! If the ECU log doesn't show an over rev, I'm wondering if there was a manufacturing (assembly?) defect from the factory.

[@bigcraig1976]

love how you can explain how your engine works and how it failed in a way that anyone could understand

[@richardwallinger1683]

superb video .. lucky owner .. at 76 years old I tend to baby / granny my motors . I believe my Perodua Kelisa car has the Toyota Yaris three cylinder motor . It is so nice to see how well built the engine is .. That piston is perfectly usable .The chance of a failure goes up exponentially with RPM. and of course mileage .I ran three engines when I won the 1980 Donnington GT championship. the practice and race engine had the cylinder head removed the camshaft buckets were inspected and the valves re seated with 1mm wide rounded seat faces . Apart form a broken crankshaft at Oulton Park racetrack . I never had an actual engine failure .9,000 rpm max self imposed rev limit .on a much modified 1 litre Hillman imp engine .

[@totojejedinecnynick]

"I love open deck 3 cylinder engines" -noone, ever.

[@RobertMitchell]

🤣🤣🤣🤣🤣

[@bastifantasti82]

@@RobertMitchell You have to do a closed deck conversion at subi performance.

[@NightwalkerUK]

🥸😂

[@nsjaaron]

Yeap close the deck

[@paulkippax4530]

Cheers Robert for showing us around this mighty little engine!

[@ewaldelfering]

Love the transparentcy off apex so cool.

[@MrGlenferd]

Reminds me of a Vauxhall I found years ago. A valve spring retainer broke and the valve was bouncing on the piston. I straightened the valve and replaced the retainer. Drove the car for 5 years.

[@andrespelaez11]

I see a Apex Tier One "get your piece of Yaris GR junk" lottery coming. How much participation needed to get one of these rocker arms? 🤤🤣

[@RobertMitchell]

Hi Andres, keep your eyes peeled for the chance to get some rocker arms. You know me too well haha!

[@ThePSHX]

I was about to ask the same question 😂, please make it happen Robert 🙏🏾

[@noizeuk]

@@RobertMitchell Resin cast keychain would be pretty neat!

[@kings3803]

Nice to see you are not taking any risks when it comes to replacing parts that are even slightly damaged which is the smart move when you are going to be thrashing it round the ring.

[@macfady2181]

Great walk through, appreciate you taking the time to lay it all out.

[@RobertMitchell]

Hi Mike, thanks for watching the video! I'm glad that you liked it :-)

[@alistairl]

Thankyou for the explanation, the last video was quite forensic and seeing the parts adds to the understanding. I really appreciate you taking the time to do this!

[@alistairl]

Quick question - that you could see the marks on the top of the piston compared to the main surface looked like something had worn off - was this a coating or simply carbon/soot from normal engine running?

[@tracktimevideos5164]

If no over-rev is logged then I would have thought this would be covered under warranty? I hope this is a failure point that is corrected in later cars. Mine arrives May '22.

[@kapsoztatoltott4537]

Can they really read the ECU rpm data back, for 5 laps which is 100+ km? Might have been the good old "Kid, I saw you smokin'..." trick (even though you didn't, obv.)😁🤷‍♂️.

[@jamescaley9942]

@@kapsoztatoltott4537 Don't think the ECU stores a lot of data at all, just the last events, I.e. it is not like a "black box".

[@burningdieselproduction5498]

@@jamescaley9942 Some premium ECUs hold timers which count how long have you been above certain revs. It would look like a given rpm and time the motor was above that. it takes one timer and a reference value and it does not use a lot of ECU memory.

[@WestfieldFreshAir]

@@jamescaley9942 I would expect it to hold some data for this to protect Toyota from warranty claims that are due to buzzing the engine and not being open like Robert has been.

[@tracktimevideos5164]

@Do One lol. You should do a bit more research.

[@The_driftologist]

Amazing technology 👏. All this power from this small block .

[@jbu89gb]

Were Toyota able to tell you what the max RPM was that the engine saw?

[@mattyoz0]

This is what I wanna know.

[@ghostwrench2292]

Not sure about Toyota but the PCM in a Ford Mustang GT350 told us the engine had revved in excess of 9,000 RPM. That car had been "money shifted" at a track and threw 2 connecting rods into the plastic oil pan and melted them into it. Also crushed the rod bearings and just massive mechanical carnage in that engine. It was pretty cool to see.

[@kevinblankenburg4816]

Good that the bottom in unscathed and the head got so little damage. In my opinion the cam should have been good with a machining/polishing, but you have a history of not taking short cuts, I like that. Have you checked the crank bearings?

[@trevorwilson2744]

Pretty cool seeing this 3 cylinder. I work in the engine assembly department at the Toyota plant in Kentucky. Looks very similar to the 4 cylinders we build. Which I guess that'd be a given lol.

[@gafrers]

How much did you ask Toyota to pay you for the honor of fixing your car? 🤣🤣🤣 Great in depth look at this pocket-beast of an engine. Hoping to see it back in action soon

[@RobertMitchell]

Billions and billions and billions and billions and billions and billions… And so on and so forth ;-)

[@James-RJM]

@@RobertMitchell of rice grains.....

[@James-RJM]

Interesting video. The easy access maintenance points through clever design will likely NOT be reflected in toyota maintenance charges unfortunately

[@Paul_VanGo]

£25K, plus free parts and labor.

[@Tristan.R.J.M]

@@Paul_VanGo don’t forget the percentage of future sales

[@zerozeropure]

Great upload as usual.... You know one of the great things about your channel Robert and company.. it's CLARITY ... From the cameras clarity , to the no nonsense attitude of your character, to the stance you take on certain bullshit and the the honesty.. it's clarity throughout it all. Reminds me of times before the internet ruined us all😂 .. there's your new tagline... Clarity... Btw picked my GR up today and only driven 5 miles... When it's run in and borders open I'm coming to Apex . Cheers Robert 🍻

[@RobertMitchell]

ThAnk you Darth!! Swing that bad boy by apex and we will catch up. Congrats on the new car :-)

[@user-od9iz9cv1w]

Looks like a Japanese motorcycle engine. I think it's interesting that we are seeing 3 cylinder engines in the Yaris, Mini Coopers and BMW I8. I guess it is a cost saving over 4 cylinder?

[@Martin52863]

It’s a 3 cylinder like a Triumph so more like a Thai motorcycle engine😉

[@sang3Eta]

EU Emissions standards. They're taxing ICE sales over 99g/km now and giving that money via carbon credits to Elon Musk. Ignoring the fact that something like an VW ID.3 is 119g/km before you even put any electricity in it!

[@ApfelmannYT]

@@sang3Eta Thats obv a lie, but pls explain

[@micsub]

@@Martin52863 A Tryota engine...

[@micsub]

@@sang3Eta Well said man, even though I'm not sure about the Elon Musk part. However, you're absolutely absolutely right about the CO2 tax. In France to buy a Yaris GR-4, it's 6039 € CO2 tax (in 2021 - 7600 € in 2022) to add to the price tag. Won't see many GR-4's registered in France for sure. Many people that buy EV are not aware that the equivalent CO2 "weight" the construction of an EV and it's battery has before even starting to drive... They are so sure in helping the save the planet from us bad petrol head polluters...

[@fabini14]

That cylinder wall are thick, omg impressive to see.

[@MarcraM82]

LOL... Aluminium OPEN DECK design...

[@fabini14]

@@MarcraM82 Any way is impressive to see that

[@MarcraM82]

@@fabini14A closed deck design is MUCH stronger and even better using cast iron vs aluminium. This design the Yaris uses (OPEN DECK block & aluminium cast) is purely for cost cutting, or in marketing speak "weigh reduction". But its a much weaker engine design and prone to cracking especially on high compression turbo charged engines . Also limits any further modding of pistons or over boaring the block also. Overall not the strongest engine.

[@THENELLYXPRESS]

I would still take out piston 1 to make sure it didn’t compress the piston rings !!!

[@hfracing]

Agreed. Recently helped check a 944turbo engine.. debris had hit the piston and the top ring was almost siezed in the grove as the piston had compressed a tiny amount.

[@my1nzfe]

You are up and running in no time. It's when the connecting rods snap the pain kicks in. Looking forward to see more laps.

[@PFCKruger]

You lucky man, your season starts full of opportunities. E30 gets new exhaust, Toyoda gets sharp camshafts and the ac removed. Kinda disapointed that the engine wasn't blown to pieces, I expected a better job considering you beeing Tier ONE but I guess we all have to start somewhere, right? Keep up the good effort. Disclaimer: I blew up two engines and one gearbox myself. One engine because I'am an idiot, the second just died from old age (piston rings, nice smoke screen though) and the gearbox blew just from the strain of being used hard on the Nordschleife. But I think you deserve big kudos for sharing all this with us because most people just fall silent when they F up and act like it never happened. Especially when it was their own fault. ;) Thanks again, looking forward to your next Videos. :)

[@MrTrev69]

Apex rocker arm keychains coming soon ✌

[@RobertMitchell]

And necklaces

[@phillipchandler8862]

Interesting video of behind the scenes operations. All this diverse content makes for a great channel Robert.👌

[@RobertMitchell]

Glad you’re enjoying Phillip !!!

[@phillipchandler8862]

@@RobertMitchell That must be the quickest reply ever.👍

[@RobertMitchell]

@@phillipchandler8862 gotta stay on top of things :-)

[@2of2DCH]

I'm just here for details on the Tier 1 Mitchell Consulting jacket merch.

[@RobertMitchell]

Stay tuned...

[@JMB1891]

All these videos of how great this car is to drive are overrated, it’s much more fun seeing it in pieces 😄

[@RobertMitchell]

Agree 😂😂

[@Smt_Glaive]

awesome car , and the engine deserves all the love and care its getting.

[@pratikagrawal4190]

Tier 1 media💪

[@RobertMitchell]

You know it ;-)

[@SROC276]

From your description and the computer saying it wasn’t really an over rev...I am still surprised the rocker arm gave in. Seems like it was a pin failure issue or valve retainer clip failure due to a defect. I would think Toyota knows these cars were going to be raced and driven hard. Accidents happens but tolerance levels would have taken care of it without issue unless you discovered a failure point. Would not surprise if a few months from now they have updated parts and changes to this engine to take care of it. I’ve overreved a few before but have never experienced a failure. It’s interesting indeed. I agree it should be covered under warranty regardless of Tier 1 baller status. Thanks for sharing...am sure many new owners are watching this with enthusiasm.

[@billx4266]

Would love to hire that car next summer

[@RobertMitchell]

It’ll be ready ;-)

[@mistamaog]

It's so cute how small the engine is!

[@piciu256]

I still believe that this rocker arm was faulty, the over rev only made it apparen right now.

[@rishabjain7864]

Maybe not faulty but, just not rated high enough to withstand momentary high stress.

[@piciu256]

@@rishabjain7864 that pin shouldn't be able to come out unless the surrounding metal is literally broken, either that or severely overheated (which cannot happen this quickly, and there are no signs of that)

[@lebza22]

Im hurt that toyota didnt make the the gr engine a 1.6 4 cylinder engine but I happy that it comes with a stick shift.

[@davidhunternyc1]

I would love to see Robert Mitchell and Sandy Munro talk about car engines. Both guys are humble, brilliant, but they come at the topic from different angles. It could be very interesting.

[@neilhaskell7264]

Could this issue happen to any GR? Do you think it’s an inherent possible weakness in the engine? Great video, really interesting..

[@benoitbricet8885]

You can money shift any car. This would happen with all cars in the world. On a Renault, you toast the entire engine, in this you need to replace one piston and fix one/two minor components. This responds to your question. Its a very though engine, making it tougher would be difficult.

[@dsman2968]

Thank you Robert. Clear, simple and well explained...so we don't accidentally make the same mistake.

[@jahyoda]

Completely Captivated by this

[@chieldof1576]

Great to look inside...looks like you got very lucky. Thank you!

[@riseandshinesunshine]

God you’re such a good teacher ! That tops up on the fact that you’re always so humble. Such a good person you are !! I’m happy that I’m following Misha to discover you and to follow you as well now!

[@jamo747]

It takes a special person to talk themselves out of a warranty job. Dealer must love you.

[@cancracker]

Stress is not only induced by revving an engine above its red line but can also be generated by significant rpm variations in a short amount of time.

[@jonleyton7905]

Really appreciate your video! Your next career should be as a diplomat!

[@nswgb69]

While it is apart I would upgrade the valve springs & retainers or at least take measurements so that Crower can make some beehive valve springs & titanium retainers. ATI Super Damper would not go a miss either. The head should be sent off to be optimised while your waiting. Shore the pistons & rods could be measured for weight & optimised....

[@Marc-qp4br]

If there was no sign of over revving on the ECU will it now be covered by the warranty?

[@RobertMitchell]

I wish but doubt it

[@Marc-qp4br]

@@RobertMitchell I have my fingers crossed for you!

[@moonsapling]

Nothing more manly than learning from your mistakes. Respect to you, dear sir!

[@futte2303]

Are The gears very close, since there are several stories of miss shifting. And do you think there are some weak spots in The engine

[@lindleyruddick8686]

Thank you for making this video and sharing. I still have my two "souvenir" bent valves from my 1971 911T when I pulled a similar "money shift". Fortunately I was also lucky and had no internal damage.

[@johnrowell942]

@DriftGames this is why the LS3 motor has stronger rockers.

[@chrissteinmeyer6119]

Love all the videos following the repair to the Yaris. Keep it up!!!

[@RobertMitchell]

Hey Chris thanks for watching man! The aim of this is to show people how we're going to fix the problem. I'm glad that you're enjoying the content and getting something out of it :-)

[@geluix69]

I was under the impression that the GR wasn’t going to be available in North America ?

[@RobertMitchell]

It’s not. I’m in Germany :-)

[@cgturbo975]

Great content again Robert, great to see inside of this new engine and great to see that you got away lightly with best case scenario in the damage department.

[@hamzasherazi9334]

Great to know you are going for the 'better to be safe then sorry' route. Probably a good shout to replace potential failing parts while you are at this stage. Also good to know that the outcome wasn't as bad. It would also appear that the downtime of the car would be the most significant bad part of this whole episode.

[@naalsoegat]

That is an impressively compact package.

[@RobertMitchell]

F1 style hahah

Thank you Robert for your explanation and for your effort to document current situation as well. I had ordered mine, so it is interresting to know with which material I will play.

[@denishamdiev2686]

Hello Robert, can you do a series where you talk about buisness give advice talk about investments, what you should be aware of when doing buisness investing etc ? Thanks!

[@RobertMitchell]

Hey Denis, how's it going? If this is something that people are interested in I 100% would make a video. :-)

[@denishamdiev2686]

@@RobertMitchell Thank you Robert you know i referred to the video where you did about Mclarens business model and it was titled business talk so i thought it would be cool to talk more about stuff like this

[@Tristan.R.J.M]

@@RobertMitchell just come up with an angle where it’s both Ring/Car related. Bet you will, give it time. P.s. this vid is going craaaazyy. The numbers are staggering! Well done guys.

[@zhuosun1314]

I am actually thinking about buying a Yaris (probably not GR) cause I really like the Hybrid tech, and I know nothing about racing ~ This video just gives me more insights and confidence in Toyota! Thanks

[@anggi6248]

Manual cars is scrary if you mis shift, Thats why they call it Money Shift. Just imagine if you mis shift a Porsche Carrera GT ooooouuu. lucky the block is safe and can be reuse in this case.

[@RobertMitchell]

Yeah that’s a heart breaker in a CGT

[@attilapuskas7090]

To me i doesn’t look like a miss shift because the rev limiter would of caught that it more like a forced downshift there is no electronic to save you from over revving

[@surfside75]

Soooo, that's a shame for such a expensive machine. Thanks for showing.

[@rubbermoetroken]

If it doesn't really show in the logs, it means that the engine could be very sensitive to valve float with the valve train as is. You might be on to something here. If this would have happened in a year or so, I suppose the options for upgrades could have been available, you seem to have wrecked it too early LOL. This engine at 8500rpm with associated extended powerband, would be even more of a blast to drive. Keep up the good work, much appreciated.

[@brianmoore2583]

This is why you'll numbers are blowing up, because you guys can rise to the occasion at any giving time. 'Remarkable Proper Car Enthusiasts'. With content like this the masses should know when coming at you'll don't come if you not coming proper, because these guys live at there A Game.👍👍

[@luiseche13]

Great explanation, thank you Robert!!

[@RobertMitchell]

Glad it was helpful!

[@DjNikGnashers]

Fascinating video, thank you. I work in the trade, and have always been suspicious of these high powered small capacity 3 cylinder engines.

[@MikkoRantalainen]

Great summary of all the damage. I agree that it makes sense to replace all parts with any potential damage even if nothing is clearly visible because the amount of work needed to tear down and rebuild it again if one of the parts later fail is so time consuming (and hence, expensive). Good point about potential hotspot on the surface of the piston head! The damage itself wouldn't be that meaningful for the mechanical movement but the temperature gradients make any defect potentially more important. I think that defect could be smoothed by machining shop, though. The surface of the intake cam is more interesting. I agree that it should have no markings at all and I first assumed you would simply send it to local machining shop for repolishing but if it has some special coating from the factory, repolishing/resurfacing is probably not a good option here.

[@phillm156]

I’ll take that as a win. Better than some bottom end damage.

[@grahamwest1079]

Good update,interesting look at the engine that most won't see hopefully

[@EdwardViaTomato]

Robert Mitchell, destroyer of Toyotas!

[@RobertMitchell]

Killin it

[@jasoneldridge4738]

Just watched another video about Toyota engines being the greatest, most reliable things in the history of man !

[@ImUrOBGYN]

Drink every time he says, "ultimately". (Ultimately, I'm pleased you made and posted this vid. Thank you.)

[@RobertMitchell]

What you drinking:-)

[@ImUrOBGYN]

@@RobertMitchell The GR Yaris kool-aid... All of it. 😍

[@P.Palamidas]

A great in-depth explanation. Enjoyed it.

[@jackcaptain5476]

Thanks for the explanation Robert, helping my mental model exponentially.

[@richardellis8696]

I am sure you would have rather it never happened, but great video, really interesting to see the engine, and obviously you were bang on with your diagnosis. Completely sensible to replace all rockers to be safe for the future. I know this has not been cheap, but for a valve to let go you have been very lucky to get away with that little damage. Look forward to seeing it back on the track soon

[@benhowe2087]

While inside the engine I would increase the valve spring rate. Port the cylinder head. Increase the cam lift. Instal a larger turbocharger and exhaust system. A possible upgrade would be solid lifter pivots to eliminate the hydraulic lifters.

[@DJRubz8]

Should do a ‘Ultimately’ word count 😂

[@RobertMitchell]

Let’s go

[@stephenj9563]

Drinking game One shot for every ultimately, get's you pissed in ten minutes!

[@800mmTelescopeProject]

It's always tricky to recollect the chain of events in a failure - I appreciate the theory that is laid down here. I have a couple of considerations though: rocker arms are built only by very few well-known bearing suppliers, they are not particularly fatigued in such applications and you hardly hear of roller/needle bearing failures in new engines. Conversely, valve retianers can be procured from many more possibly less controlled supply chain and the heat treatment con be cumbersome at times leading to quality fluctuation - on top of that retainers are actually more on the edge of their performances when adopted on high-performance engines. Only sign of metal fatigue on the retainer would answer that. Not that any of this changes the outcome and it's anyway fixed by replacing all the parts.