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Why not to use MLS hg without a perfect mating surface

Posted by TK's9d2TSi, Aug 28, 2020

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  1. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    1992 Eagle Talon TSi AWD
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  2. SasaniFab

    SasaniFab Freelancer

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    Lmao ....these poor guys have no idea what there doing. The engine damage Is severe. It’s not just a “lifted” headgasket..... the motor sounded off from the get go. Poor 4g63
     

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    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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  3. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Yeah it didn’t sound right for sure. Can’t really see how the block is but the head seems like a goner. They tore it down in a recent video
     

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  4. SasaniFab

    SasaniFab Freelancer

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    That engine was detonating like crazy, The motor was having difficulty at 12psi ....I just watch the video. Something was off in the fueling or tune for sure
     

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    1992 Eagle Talon TSi
    645 whp · 498 lb/ft · 1G DSM
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  5. Widgmaster

    Widgmaster Supporting VIP

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    This is all I got to say about this build
     

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    1969 Volkswagen Electric Cart
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    1977 Glastron Aqua Lift
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  6. Canadian_CD9A

    Canadian_CD9A Proven Member

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    They still don't know the root cause of the failure but I really don't think an imperfect deck would make it blowtorch like that - a leaky head gasket doesn't blow sparks or cause enormous head lift by itself either. Sasha, their dyno guy, has a good idea what he's doing, but that had to be fuel related detonation.
     
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  7. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    They definitely had compression getting into the coolant system. Their radiator ballooned when they removed it. I did watch this build and can’t remember if they installed new pistons or not. If it was knocking or fuel related, wouldn’t the tuner have seen this and the afrs. Real curious what actually happened.
     

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  8. SasaniFab

    SasaniFab Freelancer

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    Not necessarily, global Afrs don’t give you a picture cylinder to cylinder, I’ve had two customers that had a bad injector and the afrs were spot on. The motor was knocking like crazy. That motor sounded like absolute shit to me. That headgasket failed after detonation .... Imo anyway
     

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  9. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    That doesn’t make sense to me. How does two bad injectors not effect afr?
     

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  10. motomattx

    motomattx Proven Member

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    Because they made up for it by running the other cylinders richer to get the right global number from the header which is reading the total O2 output, not just a single cylinder.
     

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    1995 Mitsubishi Eclipse GST
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  11. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    In that case what would the fuel trims look like?
     

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  12. motomattx

    motomattx Proven Member

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    They would likely look fine, again the overall fueling is what is read by the o2 sensor, you can manipulate the injectors to supply enough fuel to look good on a single sensor, thats why some racers run one o2 sensor per cylinder to see if a single injector is completely failed or is for one reason or another not outputting what it should, whether one or a few are not contributing enough.
     

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    1995 Mitsubishi Eclipse GST
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  13. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    You’re right. That makes sense now
     

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  14. SasaniFab

    SasaniFab Freelancer

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    Yes in deed and don’t forgot.... a lot of tuners are expecting a car that is boost leak tested and ready to go. There getting paid to tune not trouble shoot
     

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  15. jed344

    jed344 Supporting VIP

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    100% half the people i tune or help ends up the car has mechanical issues. Literally spend hours on the phone with each person talking them threw how to do things and what needs to be done. But at the end of the day if the car mechanically is not ready and tune will not fix it. Most recent one was going random crazy rich while driving on 2200cc injectors and i could not figure it out. Just weird stuff come to find out he did not delete the injector resistor pack when he installed the high impedance injectors.
     

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