Alright guys, I am looking for some input on this. I have melted the intake side of my number 1 piston twice now. The first time I had the car tuned pretty aggressive and blew it on the drag strip. I figured that this was caused by an aggressive tune.

After getting a new block pistons etc. I rebuilt the motor, changing nothing except for the tune/tuner. With the full intent of tuning on the safe side this time the number 1 piston melted on the intake side again identical to the last one.

This was a very conservative tune and it blew on the dyno. Given that this was the exact same failure and on the exact same cylinder I figured it must be a bad/clogged injector.

After sending the injectors into Fuel Injector Clinic I found that they were all flowing properly, within 3% of each other.

What do you guys think is causing this?

Here are a couple of photos:
The piston without a connecting rod is the first time the motor failed, the piston on the connecting rod is the current failure.

 

Detonation? Do you have any logs?

 

What intake manifold? Perhaps getting significantly more air to that cylinder than the rest.

 

I have requested the logs from my tuner.

Currently I am running an AMS VSR intake with a stock throttle body.

 

Do you have a log of your fuel pressure? Also what did the AFR's look like. What fuel?

 

how about your injector? fuelpump?

and WHY do people change intake manifolds???? The oem one portet is the best you can ever use!!

 

Well, technically it's not the BEST you can have.. I mean there's no other intake manifold that will make more power below 5000 RPM than a ported intake manifold, but the AMS IM will make much more power up top.

Back to the subject, I think a data log will help diagnose your dilemma.

 

Sounds like a bad injector.

 

oh no ,your here too

 

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I'm everywhere...

 

looks like clogged injector possibly. before you start the car on the rebuilt motor, have your injectors flow tested and cleaned

 

I am currently dealing with the same issue except its #4. The same thing happened to me twice and I sent the injectors out to have them tested and they flowed fine. The only thing I was able to find on here from hours of research was one guy who ended up testing the injector resistors and found one did not have power and he replaced it. I am having the shop where my car is at look into this and waiting to see what they find. Just like you I changed tuners after the first time so i have excluded that its a tune issue. I am replacing the fuel injector clinic injectors with another brand as well. Hopefully someone that had this happen can chime in with a solution.

 

Check your injectors, maybe clogged. I had a similar issues issue when i had my 9, one of the injectors was very dirty. Cylinder number 3 was getting little fuel and the piston eat into the cylinder wall, and ruined my stock short block.

 

Did you not bypass the resistor box when installing your new injectors? I'm presuming you have High impedance resistors, correct?

 

eh WRONG!.

ams, skunk and AEM for example give you 10-15HP at the top, but they **** up rest of the register on the way up!

car ive seen with powerfull low to midrange and continues all the way up had OEM intakes.. And everyone was portes..

i my self have a ported intake and oem trotthlebody.. engine is responding from 3.000rpm and doesnt stop until i hit the rpm limiter at 7800..
pushing 422HP/515NM..
while when i had the Magnus Race intake, it was worse! way off!

Now im going for E85 with 2.4l and GT35GTX, hoping for about 650-700wheelies