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Thread: 604ci or 572 ci

  1. #11
    Registered xclusive's Avatar
    Join Date
    Oct 2004
    Ottawa, Ontario

    Re: 604ci or 572 ci

    Quote Originally Posted by Jassman
    check these naturally asperated beauties
    Hopefully this will help. Its one combination that has worked great for me.
    Thanks Jassman, I don't know much about engines, I'm learning as we go. I guess everybody has there own receipe. It's just that we have to find some engine builder that we'll have faith in. I'm talking with Joey Griffin, and I guess that he must be good since Reggie Fountain puts some of his engines in his boats.

  2. #12
    Charter Member #601 Charter Member Mr Gadgets's Avatar
    My Boats:
    1999; 28' Checkmate Convincer, 588" Dart, Procharger, MSII EFI.
    Join Date
    Dec 2000
    Holland, Mi USA.

    Re: 604ci or 572 ci

    do you know what crank Zul put in those motors?? Bore and stroke and what rod length?? I am thinking of going big, but not sure if it will work NA. Mine comes out to 650" with 4 7/8" crank, or 665" with 5" crank. Just not sure what the down side of all that air flow would be..


  3. #13
    VIP Member VIP Member Nykamp's Avatar
    My Boats:
    1989 41 Apache
    Join Date
    Aug 2001
    Grand Haven Mich.

    Re: 604ci or 572 ci

    Dick I don't know but I am sure you can call Richie or PM JC perf. and he can tell you. Take care, Steve.

  4. #14
    Registered JCPERF's Avatar
    My Boats:
    10 foot Kayak
    Join Date
    Jul 2004
    Long Island,New York

    Re: 604ci or 572 ci

    598 is probably the best combo for a NA motor.When you go bigger with a chevy style cylinder head they make torque but the power doesnt pick up like you would think.When you put that big arm in an engine the piston speed increases and the engine runs out of air.If it was my choice i would go with a 598.It should make peak power around 5700-5800 if the cam and heads are not monsterous.

  5. #15
    Join Date
    Dec 2002

    Re: 604ci or 572 ci

    Quote Originally Posted by xclusive
    Is a 604 ci at 5300 rpm better than a 572 ci at 6000 rpm?
    604 @ 5300= 4195 ft/min of piston speed
    572 @ 6000= 4500 ft/min of piston speed
    This means their is more stress on the bottom end with the 572 at 6000. Piston speed is the speed the piston travels while you are at a certain rpm and yes the more the stroke the faster the piston travels in the same rpm which is harder on parts----rods, cranks, bearings.
    604 @ 6000= 4750 ft/min
    572 @ 6334= 4750 ft/min
    this is the same amount of piston speed for both motors.
    As far as breathing the more stroke will always have more average torque through the rpm band.

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