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Stock piston detonation.

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Old 04-29-2014, 02:01 PM
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Default Stock piston detonation.
I blew up my BP with speed6 k04 this weekend. I knew it was going to happen, but was expecting rods. Well i found extreme detonation/ melting on piston number three. No other pistons show any signs of detonation. My beliefe is that this was caused by lack of fuel in that one cylinder, most likely a clogged injector. Am i wrong thinking this?

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Old 04-29-2014, 02:02 PM
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Niiiiiiiiiiiiiiice, what's the block look like?
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Old 04-29-2014, 02:08 PM
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Originally Posted by mckabe
I blew up my BP with speed6 k04 this weekend. I knew it was going to happen, but was expecting rods. Well i found extreme detonation/ melting on piston number three. No other pistons show any signs of detonation. My beliefe is that this was caused by lack of fuel in that one cylinder, most likely a clogged injector. Am i wrong thinking this?


Sound hypothesis.
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Old 04-29-2014, 02:08 PM
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cylinder walls are pretty messed up, ill add this is on intake side if that helps.



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Old 04-29-2014, 02:22 PM
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what is controlling your fuel?
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Old 04-29-2014, 02:25 PM
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Close up pictures of number four piston, please.
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Old 04-29-2014, 02:30 PM
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I blew up my BP with speed6 k04 this weekend.
wait what?
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Old 04-29-2014, 02:31 PM
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He's using a K04 from a Mazdaspeed 6.
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Old 04-29-2014, 02:32 PM
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im intrigued, i always wanted to swap a k04 on my msm. my previous car was also a speed6 and i have alot of left over parts including a k04. ill have to look into this
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Old 04-29-2014, 02:33 PM
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That seems like a waste of time and money.
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Old 04-29-2014, 02:33 PM
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is this the same piece of crap k04 that has failing seals when you install exhaust and turn up the boost?
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Old 04-29-2014, 02:33 PM
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what in the world are those studs in the head?
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Old 04-29-2014, 02:35 PM
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Originally Posted by 18psi
is this the same piece of crap k04 that has failing seals when you install exhaust and turn up the boost?

I thought that was a Subie thing. They do the same on the Mazdaspeeds? That's fun.
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Old 04-29-2014, 02:35 PM
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Originally Posted by Braineack
what in the world are those studs in the head?
The head bolts....
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Old 04-29-2014, 02:35 PM
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subie? subies have td04's not k04's. and they don't fail like this k04 pile of junk. dunno what you talkin bouts willis
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Old 04-29-2014, 02:39 PM
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Originally Posted by 18psi
subie? subies have td04's not k04's. and they don't fail like this k04 pile of junk. dunno what you talkin bouts willis
Local subie autox guys are always blowing turbos. They're both shitty and have "04" in them, you expect me to know the difference?
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Old 04-29-2014, 02:40 PM
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yeah the k04's arent the best turbo, but it was cheap. Im using megasquirt pnp2 with rx7 460cc injectors. Ill get some more pictures next time im by the car.
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Old 04-29-2014, 02:42 PM
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Originally Posted by Braineack
what in the world are those studs in the head?
the head bolts, lifted it off with the engine hoist since i already had the chain hooked up, left the bolts in the holes.
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Old 04-29-2014, 02:42 PM
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show us your spark table and logs of AFR

that piston looks like it was gangraped by a train of detonation.
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Old 04-29-2014, 02:43 PM
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Wow man, that things really fubar'd.

I'd send the injectors out to be tested and then cleaned if i were you. Do that and report back
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