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Thread: Motor blown on dyno tune...??

  1. #16
    The Bling Garage Mechanic Automotive Encyclopaedia Wildsupra's Avatar
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    Default Re: Motor blown on dyno tune...??

    Man it sucks to have a motor blow up on the dyno then obviously not exactly sure why. I'd be shat off too.

    Can i say one thing though, is it not possible that the head gasket simply couldnt hold the boost pressure and has blown for that reason alone? Does it have to be the result of detonation or leaning out or anything else? Sure by the looks of it detonation has been occuring but doesnt neccesarily mean its the reason for the gasket letting go.

    Not trying to cause trouble or stir shit, but just wondering if its just bad luck rather than the fault of the tuner, or yourself for driving it round un tuned.

    Matty

  2. #17
    Junior Member Grease Monkey The GW's Avatar
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    Default Re: Motor blown on dyno tune...??

    my thoughts exactly guys ok i will post up what i have not much time to write my thoughts:


    tops of pistons
    Second last power run

    AFR for that run

    Manifold Pressure


    Power run of the run BEFORE the black line which is erratic. This shows power SPIKE to 195kw however AFR and boost curve stay relatively consistent and safe?

    I have AFR for all other runs, however i have had it confirmed by a few sources that these are all SAFE and shows him just slowly getting them smoother.

    Manifold pressures look the same for all runs except for the very FIRST run (that he backed out of because of timing) when it made 17 shown below? My manifold is run off an external wastegate with spring setup and no bleedvalve or boost controller just to note.
    Ill post up first run manifold pressure just in case it shows something.


    Havent been able to get into haltech to see what timing is set up for last run, he did tell me and was open about what he supposedly did with timing, he couldve just done an insane run to get a high reading and then changed it back, but has taken it too far?
    I will get timing stuff either.
    please hit me with further opinions and ffedback i really appreciate it.
    rep for all when i get back from training
    cheers
    1984 SA63 Celica - RIP , 1979 Ford XD - The Lunar Lander
    1972 TA22 Celica - Project Car ,1986 ST162 Celica SX - Gone
    1985 RA65 Celica - Me & ryleys rally car
    1974 TA22 Celica - Current project, 1972 TA22 - Wetish

  3. #18
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default Re: Motor blown on dyno tune...??

    Just adding that it wasn't exactly untuned before he took it there, it was running the maps from his old 3T-GTE, and only running a 3 psi spring before we fitted the 17 just before taking it there.

  4. #19
    Junior Member Grease Monkey
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    Default Re: Motor blown on dyno tune...??

    Head gasket has not failed ! There has been blow by past the gasket !

    Block not flat, head not flat, head flexing in that area.

  5. #20
    Junior Member Grease Monkey The GW's Avatar
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    Default Re: Motor blown on dyno tune...??

    what makes you come to that conclusion? im having it tested at the moment, the head anyway
    1984 SA63 Celica - RIP , 1979 Ford XD - The Lunar Lander
    1972 TA22 Celica - Project Car ,1986 ST162 Celica SX - Gone
    1985 RA65 Celica - Me & ryleys rally car
    1974 TA22 Celica - Current project, 1972 TA22 - Wetish

  6. #21
    Junior Member Grease Monkey
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    Default Re: Motor blown on dyno tune...??

    From your pic the seal ring on the gasket is intact !
    So why would you get blow by past an intact seal ring ?

  7. #22
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default Re: Motor blown on dyno tune...??

    The seal ring is damaged/miss-shapen by the little dents caused by detonation

  8. #23
    Junior Member Grease Monkey The GW's Avatar
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    Default Re: Motor blown on dyno tune...??

    yes as rod said you can definately see where the detonation has dinted the ring allowing the detonation to reach the material and burn it out...
    1984 SA63 Celica - RIP , 1979 Ford XD - The Lunar Lander
    1972 TA22 Celica - Project Car ,1986 ST162 Celica SX - Gone
    1985 RA65 Celica - Me & ryleys rally car
    1974 TA22 Celica - Current project, 1972 TA22 - Wetish

  9. #24
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Unhappy Re: Motor blown on dyno tune...??

    Couldn't sleep, too hot!

  10. #25
    Junior Member Automotive Encyclopaedia 2jzhilux's Avatar
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    Default Re: Motor blown on dyno tune...??

    Quote Originally Posted by Wildsupra
    Can i say one thing though, is it not possible that the head gasket simply couldnt hold the boost pressure and has blown for that reason alone?

    Matty



    +000000001

  11. #26
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default Re: Motor blown on dyno tune...??

    That may be possible, and its just a coincidence that the worst evidence of detonation is at those two points?

  12. #27
    Junior Member Backyard Mechanic ONCE-NA's Avatar
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    Default Re: Motor blown on dyno tune...??

    But also it ran that boost quite happily with a different ecu tuned by a different guy for a few thousand kms. Interestingly though, disregarding the detonation damage, that is the shortest path to the nearest water jackets.

  13. #28
    Forum Sponsor Conversion King
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    Default Re: Motor blown on dyno tune...??

    hmmm having a better look at the gasket i tend to agree with rms (cant zoom in so i could be wrong).

    the dips in the graph are generally due to detonation but the pistons dont seem to show it and the HG is blown in the thinest possible spot.

    any pics of the plugs? also what head studs are you running? how tight? hardness test of the head?

    cheers
    linden

    PS once na i picked up your bits yesterday so they will be headed back down to you shortly.
    Quote Originally Posted by WHITCHY
    Prefer someone around the Sydney area but will travel a few hours for a good box!

  14. #29
    Junior Member Grease Monkey The GW's Avatar
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    Default Re: Motor blown on dyno tune...??

    yeah well it run 16-17 tuned by another guy happily and safely for 6000ks and then i get it tuned at 15psi and it gives way on the dyno? hmm. maybe pistons dont show it as it was so brief the detonation period?ie the dyno runs?
    ill get pics of plugs tomorrow..the cylinders it went in they are clean from the water washing over them
    ok so its either caused by a warped head or block...ill get both checked however both were machined 6000ks ago, we will see though.
    air fuel ratios and boost levels look fine.
    ignition, we dont know? is there any way apart from looking at haltech log of if it were at a dangerous level? and of course he couldve just changed it after the big run that wrecked the motor.
    what couldve caused the spike that is not reflected really in AFR or manifold pressure???
    1984 SA63 Celica - RIP , 1979 Ford XD - The Lunar Lander
    1972 TA22 Celica - Project Car ,1986 ST162 Celica SX - Gone
    1985 RA65 Celica - Me & ryleys rally car
    1974 TA22 Celica - Current project, 1972 TA22 - Wetish

  15. #30
    Junior Member Automotive Encyclopaedia
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    Default Re: Motor blown on dyno tune...??

    How long since the head was retorqued? Technique?
    All those gasket 'dents' look too symetrical and not on the exposed part of the ring to be caused by detonation to me.

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