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  1. #1
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    unveiling a 3.2 stroker '98 300 promax!!

    I just finished building a rather stout 300 pro-max for a longtime customer, and wanted to share the results with you guys. My customer had ran his 300 without oil, and could not hear the warning alarm, so his engine blew beyond reasonable repair. He decided he wanted more power, so we custom built a stroker with the new 3.2 stroker 300xs crank (custom machine work needed of course to fit it all the extra stroke in there)We used a pro fuel controller from Simon to alter the fuel curve, but other than that, the intake-throttle body-reed blocks-efi system, etc is all STOCK original 98 pro-max 300) It has been to the lake a few times, and is still breaking in, but this thing is a beast!!!! Its on a bullet 21xdc, with 16" setback and a spinnelli 30, 1.62 SM. The original engine would turn this combo 5800, with a moderate holeshot. The new stroker jumps out of the hole and turns 6200. We will be dyno testing this engine in a couple weeks, and will post the dyno sheet. The bottom end and midrange torque this thing has is just freakin amazing!!
    Tony Reynolds, cheaperboatparts.com--BBC sponsor

  2. Moderator 21XDC's Avatar
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    #2

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    Sounds awesome!

    Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html

  3. Member
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    #3

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    AHHHHHH....right up my ally. GOOD JOB TONY! Anxious to hear what the dyno results are.....

  4. Member esdbass's Avatar
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    #4

    Re: unveiling a 3.2 stroker '98 300 promax!! (redline)

    What type of dyno are you going to be testing it on?

    Sounds very exciting! Good Luck with it

    BTW: 3 or 4 blade 30" Spinellie ?

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
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    #5

    Re: unveiling a 3.2 stroker '98 300 promax!! (esdbass)

    And the dyno says:





    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 48 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor

  6. Member
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    #6

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    JUst wondering what the WOT speed is when the new monster is broken in.

  7. Member
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    #7

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    We have a land and sea dyno equipped with Dyno-Max 2000 Pro software.
    Not sure on the speed, cause when i was testing the boat I got into some rollers before i ever opened it up and my garmin went for a swim. When i get it back for dyno testing it will be tested with GPS for accurate speed.

  8. Member esdbass's Avatar
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    #8

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    Did you ever have a "before" Mod Dyno number? and that's a Land & Sea Dynomite Dyno right?

    Very interesting project, please keep us informed. I assume it's on a 1.62 Sports Master case?

  9. Member
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    #9

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    Any #'s yet?

  10. Member
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    #10

    Re: unveiling a 3.2 stroker '98 300 promax!! (Todd D)

    the guy who owns the boat is still fishing, I cant get him to bring the boat back to leave it with me yet. He says the fishing and the running has been fun, hes not ready to give it up yet. I'll post as soon as i get the boat back and dyno test it.

  11. Member
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    #11

    Re: unveiling a 3.2 stroker '98 300 promax!! (Tony Reynolds RPM)

    Now you've really opened up a can of worms ! I'll be waiting to hear how this runs out ! I think the stroker cranks are going to be a high demand in the next few years !!

    Great job !

  12. Member
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    #12

    Re: unveiling a 3.2 stroker '98 300 promax!! (hotbeek)

    GET IT BROKE IN THEN SKINITBACK!!!!!!!!!!!!!!!!!!!!

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