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Thread: 684/572Tq

  1. #1

    684/572Tq

    684whp/572lbs TQ
    KA-T & SR's
    Engines R Us
    www.enginerebuild.net
    "Anyone can make power but how long can you make it last?"

  2. #2
    That is some serious power!

    And I like your sigline - "... how long can you make it last?"
    If someone blows up a school with a bomb they go after the bomber ... if someone shoots up a school they go after the gun.

    A privilege is just a right that has been taken away by government.

    Political correctness is cowardice wrapped in a lie.
    ________________________________

    2013 Acura RDX Tech, 30% tints, hardwired Escort 8500 X50

    2011 Infiniti M56, 30% ceramic tint, hard-wired Escort 8500 X50, LED cabin and trunk lighting - traded!


  3. #3
    Yea, I hurt the stock head gasket on the 650 pull then finished it off on the 684 pull. Paper gasket just couldn't hold the cylinder pressures at that power which i didn't give it enough thought but I never had a problem in the mid to high 500's so I didn't really know how far that gasket could go but to be honest that is really impressive to make it that far before the gasket couldn't hold anymore. So I would say the stock gasket is good for 600whp or less. I scored some Cosworth MLS gaskets and will prep the surfaces and put this thing back together plus put in a shorter runner manifold instead of the stock manifold.
    684whp/572lbs TQ
    KA-T & SR's
    Engines R Us
    www.enginerebuild.net
    "Anyone can make power but how long can you make it last?"

  4. #4
    Agree - I wouldn't have thought the stock gasket could stand up to that. A metal gasket is the only way to go with high compression and big hp.

    That's still impressive.
    If someone blows up a school with a bomb they go after the bomber ... if someone shoots up a school they go after the gun.

    A privilege is just a right that has been taken away by government.

    Political correctness is cowardice wrapped in a lie.
    ________________________________

    2013 Acura RDX Tech, 30% tints, hardwired Escort 8500 X50

    2011 Infiniti M56, 30% ceramic tint, hard-wired Escort 8500 X50, LED cabin and trunk lighting - traded!


  5. #5
    I would look into some stronger head studs. I stretched a set of regular ARP head studs on a 4G63 at 40psi on a HX40 turbo. New gasket and stronger ARP L19 studs torqued much higher and it holds 40psi and a 75shot of nitrous.

  6. #6
    Administrator Kingtal0n's Avatar
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    appreciate the graph and all, but it would be really helpful if you posted more details, like which engine for starters.
    Bioengineering
    Control systems processing
    RNA splicing

  7. #7
    Quote Originally Posted by Kingtal0n View Post
    appreciate the graph and all, but it would be really helpful if you posted more details, like which engine for starters.
    Sorry Kingtal0n, it's just KA motor.
    Standard over the shelf Weisco Pistons and eagle rods. BC Stg3 cams
    E85, 33 psi, 67 mm twin scroll.
    Is that better.....
    684whp/572lbs TQ
    KA-T & SR's
    Engines R Us
    www.enginerebuild.net
    "Anyone can make power but how long can you make it last?"

  8. #8
    Administrator Kingtal0n's Avatar
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    Jul 2004
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    Quote Originally Posted by duncan351 View Post
    Sorry Kingtal0n, it's just KA motor.
    Standard over the shelf Weisco Pistons and eagle rods. BC Stg3 cams
    E85, 33 psi, 67 mm twin scroll.
    Is that better.....
    If I was going to learn something from your post I would want even more, thats a good start though

    think of everything you know about the car and post whatever you are willing to, some suggestions,
    vehicle weight, max timing at 33psi, compressor wheel speed max, valve spring, head work, intake/exhaust manifolds, pipe length/diameter, intercooler core type/size, tire/wheel size, how many days abused, what oil temp and water temps you use, bearing clearance/type, oil viscosity, rolling resistance, fuel system info, air/fuel ratio used, previous experiences with the same type of engine in the past and failures you have incurred and learned from,

    just anything, anything you can imagine can be useful
    Bioengineering
    Control systems processing
    RNA splicing

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