ok, its been said over and over that stock cars have blown, but its all from third person, where is the f---ing owner, what was the result? if its stock..it should be covered by dealer and the dealer should diagnose the problem and tell the owner what's up ..right?

So far I haven't heard anything/anyone who own a stock car that goes kaboom that came back here or other forum to explain what happen/ or dealer results/ dealer explanation...

so can we put the stock blown engine to rest until the owner comes forward ....we are scaring future speed owners with these "stock engine blowing up shit"

Also scaring the current owners and making them paranoid LOL

It was a guy on 247,he was completely stock and blew his motor.

Ya but if you recall that situation also had an oil drain plug that wasn't put on properly issue from the dealer.

Well the two that my dealer told me they did there that were worked on by my best friends father who is the shop foreman said the last one blew because two injectors stuck open. The first one because the clips that hold the wrist pin in place failed. The modified ones that have blown seem to show the same symptoms of bad locks in the piston. Odds are that if the car is bone stock...they are not lurking a forum. They just purchased it because. So you may not ever hear from them.

Maybe there's just a few with bad locks.. Just like there's a few with bad mounts...bad fuel pumps..vibrating windshields..n bad floor mats..

I did. This was after babying it for 100 miles.

My condolences to the OP. It is a fucked up situation that you have to go through that is shared by many others and could happen to any of us at anytime. I have had the car for over two years now and have seen a couple engines blow first hand. One had only 10K and bone stock while the other friend of mine had one with around 30K and Intake and TBE. One was boosting and the other was just cruising, so no pattern there. I myself have tried to take as many precautions as I can. I have been running meth for about six months now with a 60/40 meth mix in the summer and straight meth in the winter. I have the denso 2 step colder plugs, the BSD, OCC, HKS ignition, 94 octane, safe tune (my afrs are 11.3-11.7) etc etc. No matter what I do I always get part throttle knock as high as 6degrees at times and the odd time I will see a kr of around 2.1 at WOT. I run 20psi and the car has been dynoed a few times in the 340 - 360whp. So iknow everytime I drive and everytime I boost I might be DONE!. It is something I have gotten used to dealing with because so far I don't think we have figured out a bullet proof set up on the stock block.

i remember reading about that, stock everything (supposedly) and he was told that a pin failed and caused the rod to go through the block.

The retaining clips failing sounds plausible for the an engine blowing part throttle.

My windshield creaked, and my oil pan wasn't sealed well so I hope that's the worst of it :)

What year were the other two cars that have blown do u know?

The 30K was an 07 while the stock 10K was an 08.

damn..guess it doesn't matter what year they are.

Well.. the fuel pump issue wasn't fixed until later model 2008s. Probably be hard to find a guy with no mods who had a monitoring tool though.

Honestly, it has already been said, but it is worth repeating for you guys. If someone with a stock car blows their engine, they are probably not on an engine mod forum.

I will also say that I have one of the few drivable modified mazdas in town, all the rest have blown engines. One of the more memorable was a guy who was "just driving down the road" and threw a rod through the side of his block. Apparently he was just driving down the highway and downshifted into 2nd and the engine blew at over 8000rpm, and he was stone stock with less than 2k miles on his 08 MS3. Alot of this "I was just driving down the road" bs I dont believe, even if once in a blue moon that really was what happened.

Aren't these rev limited at 7k?

when i was at mazda for service there was a blown cx7 with the head sitting on the floor, so they do happen we just dont know about them

you wont believe it until it happens to you, why it is so hard to accept that these engines have a flaw even the techs at the dealer where i used to go know this, bad engineering. mine blew up 2nd gear under 2000 rpm, piston pin came loose, engine still seating at ocean mazda if anyone wants to go check.

weren't you running an OTS AP map with a gt30? pretty sure thats a no no

LMAO......

Cosmic, no rev limiter is going to save you if you misshift into 2nd instead of 4th and instantly punch thru 8000rpm.

The rev limiter will save the idiot accelerating without shifting, but it wont save the idiot skipping a couple of gears when down shifting.

if there were a flaw, and its documented, there would be a recall...what if some poor bastard died in a crash because his engine soup up while he is going 50mph...and his family found out that other owners have blown engine also and mazda did nothing about it. Can you say multi-million lawsuit...
If there is actual stock cars out there that have blown...(I'm not saying that there isn't)then most of you shouldn't worry that Mazda won't cover your warranty if its your turn, if it happen to me, I will give them hell, they will have to prove it in court that its my fault and not theirs.

BlackMica....running a gt30 and you blew....that's not stock the last i looked under my hood...

so now that's maybe 2-stock that might of blew out of what 25-++maybe...the rest have mods
Tizi....this is the first time i heard of a stocker blowing (heard rumors of it a year back)being it was your friend please tell us about it ,and possibly why, and his driving habits.
Also the one with 30,000 miles with a TBE and CAI.....same mods i have??? Maybe i am being ignorant here but, if i blew my STOCK engine i sure as hell would go to a forum and talk about it unless i was getting rid of the car, then i would say fuck it, but i would be so pissed i would open up. Also any engine could blow...and this one especially being tempermental about pushing its limits....There could be many reasons for failure...trying to redline it too many times when the car is caughing up blood at 6500 rpms, downshifting from 5th to 3rd and bringing the rpms up to 7000 rpm, many reason, but if you have any clues on the stocker than let us no...Luckily i drive fairly easy and have not pushed to car to areas i no may cause failure, .....Honestly i am tired of all this.....and as Haltech mentioned my power level should not be of concern for failure...as his est of 350 whp=FAILURE.....IMO it's even lower than that. Luckily my dealer installed my bolt-ons and is honoring my warranty, otherwise i may have a different view..

oh so now the ap was the cause of my engine blowing up, i wasnt even on boost when it happened and i was running a custom map that cristian send me.

don't pay people any mind man. Plenty of members nitpick a situation to find ANY reason to justify why a person blew up. If I blew after I stocked out they would say "Oh well you beat on your car and had a bigturbo" and if a completely stock person was to throw a rod it would be "Oh well you just got a bad motor" there ALWAYS gonna have an excuse as to why some one blew up.

delete

No one is gonna admit to the reason why they blew up cuz they can't drive or they have bad habits, especially to a forum or the dealership.

true

Been driving stick since i was 17 (now 42). I still fuck up gear changes, I could swear I'm in one gear and instead I hit another. Having said that some of these blown engines are, simply put; driver error and that driver may not even realize it...to the OP ,sorry to be off topic and random, good luck getting it fixed.

I think we all know that the engines that blow under no load under 3k are from the wrist pin clips failing. What we have yet to discover is if this is due to overheating in the combustion chamber, knocking, or just plain bad manufacturing (or a combination). We obviously know that the stock ones blowing are bad manufacturing.

Hey lido, the stocker was not a friend. I met up with the dude at a race track and a few months later I stumbled on to him at the same track and he was driving a WRX., He told me that he was stock when he blew. Whether he was or not I am not sure but I see no reason for him to bullshit me but you never know.... as for the 30K car, that is a friend who does drive it like he stole it all the time. He went back to stock and took his to the stealer and got a new block. He has the same mods on the car like he did before and he has meth. I don't know man with all the engines popping. I baby the car most of the time but when I go I go...all gears full boost 20 psi spiking to maybe 21 and I have my fucken fingers crossed. Good luck to all of us here and once again my deepest sympathies to anyone who has popped or will.

jarod so whats the word from the dealership?

I don't believe the balance shaft is the cause of these engines grenading. It's not like the balance shaft concept is something new. It's been used on 4 cylinders for friggen decades. I just can't bring myself to believe that Mazda fucked up the engineering on the balance shaft assembly enough to cause motors to blow. A rod without prior fatigue or some sort of flaw doesn't snap accelerating from 2.5k RPM under vacuum or even 1-4psi.

well they are attempting to fuck me but after being threatened with an attorney they decided they would investigate the matter a little more. So now they are tearing down the engine to determine the exact cause of the failure.

are they trying to blame the exhaust? i'm kinda curious what else they would use. blaming 'spirited driving' for a blown engine on a high-performance car would be bogus.

Well they indeed fucking me. They are saying that as a result of my boost controller sometime ago ti caused the rod to bend and overtime it became more and more fatigued and it finally gave way. The boost controller was on the car all of about 3000 miles and i never could get it to work right about 16psi anyway so it really wouldnt affect the car. It has also been off the car for 11,000miles. So, at this juncture i am not sure what i am going to do.

What boost were you running the standback tune at?

Damn that sucks. Did the dealer ever say anything when you took the car in with the boost controller on? Sounds like they documented it silently....

Yes they know when it came off. The dealer was on my side it was corporate That screwed me over.

So the dealer told corporate you had a boost controller on the car?

Yeah how did corporate find out you had it on there?