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OMG My Engine is Toast

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  • #61
    John, get off the high horse and let us get the complete lowdown on your complete set-up.

    I hate to break the news to you, but you are in the same boat as me. I rebuilt my engine TWICE before I realized that detonation was the culprit. You have to remember that your ECM is going to autamatically pull timing with detonation, thereby masking it.

    You have a 1BAR MAP, this means that your ECM can only read potentially up to 14.7PSI ABSOLUTE PRESSURE! That is one atmosphere at sea level, when you add boost over 0PSIG (guage pressure) your ECM is no longer adding fuel to compensate. You would have been better off raising your FP then trying to tune when you can't read past 0PSIG (stock MAP's actually can't read that accurately even). It sounds like you were tuning for RPM only in your BIN files, but who am I?

    Those pistons in your car in the pics look like they have at least 20k miles on them, how do I know - because I have had more than one 660 completely apart and can see th wear patterns of these motors (especially gen1's).

    You had detonation causing one of the cylinders to detonate, in turn causing your failure. I have been in the same boat as you, but my car could be heard in the kitchen while my wife ws doing dishes, from down the road. I got home with a running/knocking engine and she simply says to me "That didn't sound too good" in an innocent fassion.

    I'm not going to sit here and flame you, but it's your own mistake - so take it like a man and get back on the horse with the newfound data you have obtained from your experience, and do it right this time.

    If I were you, I would kick your "mechanic" to the curb and start collecting some tools to do the job the only way it's goin to be right - "By yourself".

    My $.02 take it of leave it, but if you think you are going to now turbo another stock motor and be any fast, you are fooling yourself. Another motor is going to bite the dust if improper tuning is an issue.
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    • #62
      i agree totally with what everyone said. the 3400 is a STRONG engine john. i put down 358hp and 365ft lbs on a 100% stock bottom end on 9psi!!!! tune was your problem. guaranteed you were having some detonation and put a huge shock load on the valve train (as stated by others)... better luck next time?
      [SIGPIC]
      12.268@117... 11's to come!
      turbo 3400: 358whp and 365tq at 9 psi
      ASE Master Technician. GM Certified.
      http://www.youtube.com/watch?v=7ibU1k8UZoo
      http://www.youtube.com/watch?v=GUqJyopd720

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      • #63
        who cares if its shattered? ive always wanted to see inside of the ports and water passages

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        • #64
          Was this engine using the factory harmonic balancer or an under drive pulley?
          1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
          1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
          Because... I am, CANADIAN

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          • #65
            damper, not balancer.... sorry, just one of my many 660 pet peeves.....

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            • #66
              When you don't listen to people you get what you deserve. Which is why I hate everyone because no one listens to me! The pistons look pitted. They shouldnt be so clean either....I'm so surprised the valvetrain took the damage....I'll bet the bearings are all pancakes by now.
              Lorenzo
              '11 DODGE Challenger R/ T Classic 57M6 Green with Envy "Giant Green Squid"
              '92 PONTIAC Grand Prix SE 34TDCM5 "Red Lobster"

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              • #67
                dang, Detonation...umm that was my last problem. that was fixed.
                I dont know exactly what happend, but it wasnt good...
                I was running 2 ranges colder than stock on my plugs. And it was cold outside when this happend, So detonation prolly wasnt it.
                it was a major malfunction is what it was, lol.....

                My pistons were brand ne maybe 3-4 K miles.
                They looked a hell of lot better than my last set..thx to tuning.
                I dont know guys....Tell you the truth Im done with my car, I cant afford another engine. And my tranny needs to be replaced. F***.
                Im not sure what to do. Myabe go all show no go?

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                • #68
                  Maybe you should listen to everyone here like I did on my project. These guys know what they are talking about. Maybe if you listen to people that know what they are doing you wouldnt be in this position right now.
                  sigpic
                  1994 Oldsmobile Cultass Supreme SL
                  3400/Getrag 284 5spd
                  1995 Chevy K1500 350c.i. 5spd Z71
                  350/NV3500 5spd
                  2014 Chevrolet Malibu LS

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                  • #69
                    Originally posted by john_V63400 View Post
                    ...So detonation prolly wasnt it.
                    it was a major malfunction is what it was, lol.....
                    on behalf of the user.... doesn't have to be hot outside for detonation to occur, does it have to be a certain temperature for c4? dont think so... detonation is detonation at any temperature, in terms of an engine its an un-timed "explosion" that is not caused by the plugs... this isnt good at any temperature or at any time, think about it....

                    Originally posted by john_V63400 View Post
                    ...My pistons were brand ne maybe 3-4 K miles.
                    They looked a hell of lot better than my last set..thx to tuning...
                    and they still didn't look all that great for the mileage... whats that tell you? it tells me that you never did tune it right

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                    • #70
                      Originally posted by 19Cutlass94 View Post
                      Maybe you should listen to everyone here like I did on my project. These guys know what they are talking about. Maybe if you listen to people that know what they are doing you wouldnt be in this position right now.

                      I did....Alot infact......Just cause I didnt get to it in time doesnt mean I didnt listen and disregarded any professional advice, why would I ask if I knew already or wasnt going to do it.

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                      • #71
                        Originally posted by El_Diablo View Post
                        on behalf of the user.... doesn't have to be hot outside for detonation to occur, does it have to be a certain temperature for c4? dont think so... detonation is detonation at any temperature, in terms of an engine its an un-timed "explosion" that is not caused by the plugs... this isnt good at any temperature or at any time, think about it....


                        and they still didn't look all that great for the mileage... whats that tell you? it tells me that you never did tune it right
                        Tune right........depends who your asking. but yeah I know they still dont look god for that mileage. im going to make a word doc of all my trial and error. That way next time RSM guy comes along, i can just say......Forget about it, its never going to run right. Heres everything I did and it didnt last. My advice for any 3400 Z-spec buyers is.....Dont buy. Go N/A from milzy.

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                        • #72
                          what does milzy have to offer that ben doesn't do better? seriously....

                          and ive seen tuned boosted systems last longer on stock internals so it really says nothing about these engines or boosting them

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                          • #73
                            you can spend a lot more money with milzy for the same stuff you can get from Ben! funny....it's cold outside so you can't detonate. haha!
                            Andy

                            sigpic

                            fastest 1/8: 10.19@ 67.17
                            fastest 1/4: 16.16@ 82.70

                            62mm TB, 1.6 roller tip rockers, Ostrich 2.0, UD pulley, TB heater bypass, K&N, 180* stat, No cat, 99Grand AM dual cooling fans. 4T65E swap FDR 3.69, EP LSD, F.A.S.T. transmission controller, TransGo shift kit.

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                            • #74
                              Your endorsement of milzy just made my day. Its only 1:16AM!
                              Ben
                              60DegreeV6.com
                              WOT-Tech.com

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                              • #75
                                I'm pretty sure i've spanked Milzy back to 2002 with my N/A setup. God knows how much he would have charged me to do the same build.


                                We can bitch and moan about tuning all day.. that's all done and over with, the engine's blown so lets move on to the important things.. like MORE PICS!
                                Past Builds;
                                1991 Z24, 3500/5 Spd. 275WHP/259WTQ 13.07@108 MPH
                                1989 Camaro RS, ITB-3500/700R4. 263WHP/263WTQ 13.52@99.2 MPH
                                Current Project;
                                1972 Nova 12.73@105.7 MPH

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