What went first?: 342 Bonneville mishap
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What went first?: 342 Bonneville mishap

  1. #1
    Resident Ford Nut Sleeper CP's Avatar
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    Default What went first?: 342 Bonneville mishap

    So on the 15th run of the week the little 342" laid-over at 6,700 rpm at 185 mph at 2.5 miles of a 3 mile run.
    the AF was 12.7 at mile 2. when it laid-over I checked the gauge and it was 14:0





    the exhaust valve wacked the piston pretty good:






    I'll be checking the valve springs next week. The protruded plugs will be coming out.

    The engine will get a fresh-up, but I have a feeling the Mustang will be getting my 410" Windsor in it next year. 680-700hp vs the 550hp from the 342"...200 mph here we come.

    So what went first? that's a lot of damage from the plug and what's left of it


    S CP

    (well I can't really be mad, this engine got a hell of a work-out from the crew (3) driving it. they put 12 of the 15 passes on it as they got their licenses)



    Hey Bostick...you looking for something else to do?

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  3. #2
    gn7
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    The plug started it.
    Is that the only exhaust that hit? Plug electrode could have had a little to wth that as well.

    Extended electrode plugs are bad news in extended high RPM, high compression applications. You can put one in a blown deal and lose it in mere seconds.



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    Senior Member Oldsquirt's Avatar
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    Quote Originally Posted by Sleeper CP View Post
    ...................... when it laid-over I checked the gauge and it was 14:0
    Keep in mind that by the time you felt the motor lay over, the A/F you were seeing was the result of the problem, not the cause. A weak or dead hole pumps a lot of oxygen down the pipe.
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    gn7
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    Yeah it does. And if its an EFI, then the CPU starts throwing fuel at it and the thing starts running even worse, goes pig rich, the CPU backs up and it becomes a circle jerk.
    If it carbed, you just get a LEAN reading and it holds. But its no real world indictation of whats going on in the other 7 holes.
    AFs don't mean squat in anything less than a "hitting on all 8" engine.



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    Quote Originally Posted by Oldsquirt View Post
    Keep in mind that by the time you felt the motor lay over, the A/F you were seeing was the result of the problem, not the cause. A weak or dead hole pumps a lot of oxygen down the pipe.
    Oh yeah all had already gone to shit by the time I saw it.

    S CP

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    Lets see the car, ive been to texas mile but never the salt flats. Its on my bucket list. I want to do it in a truck.
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    car went 188mph in the timed 3 mile. Showed 192.4 mph on the gps (exit speed)
    Next year we try for 200 with it. I think we can do it by pulling the C-4 auto and installing a G-Force 5 speed. But the 400+ Windsor sounds like a lot of fun.


    S CP

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    Cool stuff,
    did you guys get to checkout the 550 Streamliner of Treit and Davenport?
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    [QUOTE=gn7;1703557]The plug started it.
    Is that the only exhaust that hit? Plug electrode could have had a little to wth that as well.

    Extended electrode plugs are bad news in extended high RPM, high compression applications. You can put one in a blown deal and lose it in mere seconds.[/QUO]

    bob what do you recommend running in a blown alky deal??? my heads use this same style plug and i bought 7-10 on the ranges to play with but they are all extruded electrode style plugs..thanks for the help jeff
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    gn7
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    [QUOTE=racer;1704408]
    Quote Originally Posted by gn7 View Post
    The plug started it.
    Is that the only exhaust that hit? Plug electrode could have had a little to wth that as well.

    Extended electrode plugs are bad news in extended high RPM, high compression applications. You can put one in a blown deal and lose it in mere seconds.[/QUO]

    bob what do you recommend running in a blown alky deal??? my heads use this same style plug and i bought 7-10 on the ranges to play with but they are all extruded electrode style plugs..thanks for the help jeff
    I have never ran alky so somebody else would be a much better source. My guess would be that you can run a pretty warm plug due the fuel cooling the plug. I'm guessing the 7 are alot closer than the 10s. I'd be suprised if you can even use the 10s
    14MM .750 reach NGK Non projected plugs are part # (7)4091, (8)4554, (9)5238, (10)5820 or stock # R5671A-(7,8,9,10)
    But the plug Jon was running is roughly the same heat as a NGK 6, maybe even a touch warmer. Thats pretty toasty for a salt car running WOT for 3+ miles.

    I am a fan of the warmest plug that doesn't self distruct, but start on the cool side and go warmer. We started with 9s but now run 8s.



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    [QUOTE=gn7;1704987]
    Quote Originally Posted by racer View Post

    I have never ran alky so somebody else would be a much better source. My guess would be that you can run a pretty warm plug due the fuel cooling the plug. I'm guessing the 7 are alot closer than the 10s. I'd be suprised if you can even use the 10s
    14MM .750 reach NGK Non projected plugs are part # (7)4091, (8)4554, (9)5238, (10)5820 or stock # R5671A-(7,8,9,10)
    But the plug Jon was running is roughly the same heat as a NGK 6, maybe even a touch warmer. Thats pretty toasty for a salt car running WOT for 3+ miles.

    I am a fan of the warmest plug that doesn't self distruct, but start on the cool side and go warmer. We started with 9s but now run 8s.
    thanks for the no projected #s we were told to run colder plugs than our gas setup..we ran 7s so i was going to start out with 9s..i like the non projected deal..will order several set tommarow and return most of the ones i have..thanks bob..jeff
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    gn7
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    [QUOTE=racer;1704992]
    Quote Originally Posted by gn7 View Post

    thanks for the no projected #s we were told to run colder plugs than our gas setup..we ran 7s so i was going to start out with 9s..i like the non projected deal..will order several set tommarow and return most of the ones i have..thanks bob..jeff
    NGK plugs get COLDER as the number gets higher!



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    [QUOTE=gn7;1704993]
    Quote Originally Posted by racer View Post

    NGK plugs get COLDER as the number gets higher!
    .
    yes i was told by alky guys to run colder???? thats what i was told..dont know..will have all on hand to tune with.. just hope to hit it close.
    Last edited by racer; 08-29-2012 at 08:09 PM.
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    gn7
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    [QUOTE=racer;1704998]
    Quote Originally Posted by gn7 View Post
    .
    yes i was told by alky guys to run colder???? thats what i was told..dont know..will have all on hand to tune with.. i come prepared..preperation is the key.
    See, that why I said talk to an alky guy. They would know. My instinct tells me warmer. But then my instinct is probably responsible for all lot of trashed stuff.



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