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Thread: OptiMax JP

  1. #1
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    Cool OptiMax JP

    I do believe this has been brought up before, but I just stumbled on it today, pretty interesting tech:

    http://www.mercurygovsales.com/technology/optimaxjp.php



    I sure do like the stealth lettering on the cowl

    <TABLE class=tableSpecs cellSpacing=0 cellPadding=0 border=0><TBODY><TR class="" vAlign=top><TD>Propshaft Rated Horsepower</TD><TD class=specsDataRight>185 (139 kW)</TD></TR><TR class="" vAlign=top><TD>Full Throttle RPM Range</TD><TD class=specsDataRight>5000-5800</TD></TR><TR class="" vAlign=top><TD>Cylinders</TD><TD class=specsDataRight>V-6 (60º vee)</TD></TR><TR class="" vAlign=top><TD>Displacement</TD><TD class=specsDataRight>185 cu. In. (3032 cc)</TD></TR><TR class="" vAlign=top><TD>Bore</TD><TD class=specsDataRight>3.63” (92 mm)</TD></TR><TR class="" vAlign=top><TD>Stroke</TD><TD class=specsDataRight>3.00” (76 mm)</TD></TR><TR class="" vAlign=top><TD>Induction System</TD><TD class=specsDataRight>2-Stage Direct Fuel Injection</TD></TR><TR class="" vAlign=top><TD>Ignition</TD><TD class=specsDataRight>Digital Inductive</TD></TR><TR class="" vAlign=top><TD>Charging System</TD><TD class=specsDataRight>60-amp (846 watt) w/Voltage Regulator</TD></TR><TR class="" vAlign=top><TD>Gear Ratio</TD><TD class=specsDataRight>2:1 (FM)</TD></TR><TR class="" vAlign=top><TD>Lubrication System</TD><TD class=specsDataRight>Electronic Multipoint</TD></TR><TR class="" vAlign=top><TD>Recommended Oil</TD><TD class=specsDataRight>Mercury Premium Plus TC-W3</TD></TR><TR class="" vAlign=top><TD>Required Fuel</TD><TD class=specsDataRight>JP5, JP8 or Commercial Jet A fuel</TD></TR><TR class="" vAlign=top><TD>Rotation</TD><TD class=specsDataRight>Left or Right Hand</TD></TR><TR class="" vAlign=top><TD>Shaft Length</TD><TD class=specsDataRight>25” (635 mm) or 30” (762 mm)</TD></TR><TR class="" vAlign=top><TD>Weight</TD><TD class=specsDataRight>512 lbs. (232 kg)</TD></TR><TR class=ruled vAlign=top><TD>Warranty</TD><TD class=specsDataRight>One-year limited warranty for military agencies</TD></TR></TBODY></TABLE>
    22' Activator w/ 250xs Merc Opti, back home again

  2. #2
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    Yea, but they stink!!!!!

  3. #3
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    Quote Originally Posted by Stinky
    Yea, but they stink!!!!!
    OK that is just a bit ironic Stinky saying they stink
    22' Activator w/ 250xs Merc Opti, back home again

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    Only 185 hp ??
    That sucks!

  5. #5
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    Quote Originally Posted by blkmtrfan
    OK that is just a bit ironic Stinky saying they stink
    Its not ironic at all.

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    Quote Originally Posted by supaboatmillenium
    Only 185 hp ??
    That sucks!
    What sucks about 185 "rated" HP on 12 GPH of kerosene?

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    Quote Originally Posted by Stinky
    What sucks about 185 "rated" HP on 12 GPH of kerosene?
    Not much
    22' Activator w/ 250xs Merc Opti, back home again

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    We had a press release several months ago on this or a similar project. Very cool. I like the graphics as well.

    Greg


    Facebook | YouTube | Vintage Outboard Catalogs
    Photo prints available of your boat - click here


  9. #9
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    Quote Originally Posted by Scream And Fly
    We had a press release several months ago on this or a similar project. Very cool. I like the graphics as well.

    Greg
    I though I had read about it here a while back, but didn't remember the photo
    22' Activator w/ 250xs Merc Opti, back home again

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    they need to add more compression and the HP will increase.. JP5, Kerosine and other Military spec fuels are more like Diesel in their properties and require a higher compression ratio to build HP... I do believe that that motor has only a 7:1 compression ratio or less that motor with 10:1+ compression would eclipse the existing Gasoline powered OBs out there...

    mil. spec fuels have more BTU potential thus more HP potential if designed ONLY for it.. that motor can also still be ran on gasoline it hasto to meet Mil spec..

    4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she


    things that were are no longer as they are today...

  11. #11
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    um, the 250XS only has 6:1 compression... compression on 2 strokes is measured by when the exhaust port is closed...


    as for higher compression ratio, yes, it will make more power... shortly before it goes BOOM.

    this motor is a spark ignited engine running on a diesel-like fuel... it greatly diffrerent than a compression ignition diesel engine, so the analogies to a diesel motor wont hold water!

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    Quote Originally Posted by 150aintenuff
    they need to add more compression and the HP will increase.. JP5, Kerosine and other Military spec fuels are more like Diesel in their properties and require a higher compression ratio to build HP... I do believe that that motor has only a 7:1 compression ratio or less that motor with 10:1+ compression would eclipse the existing Gasoline powered OBs out there...

    mil. spec fuels have more BTU potential thus more HP potential if designed ONLY for it.. that motor can also still be ran on gasoline it hasto to meet Mil spec..
    What jimmy said and more. This motor is knock limited. Compression does you no good.

    Besides, its a work motor.

    Has to meet MIL spec????????? What does that mean?????

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    mil spec means bring money. its my business.

    its a set of standards used by the military to buy items or used to produced items. the FAA used some military spec for items such as jp5, 10... fuels

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    Quote Originally Posted by hsbob
    mil spec means bring money. its my business.

    its a set of standards used by the military to buy items or used to produced items. the FAA used some military spec for items such as jp5, 10... fuels
    But what does it have to do with the motor???

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    because it is built for military and government agents it has to meat MILITARY SPEC.. and just because it is Spark ignited does not mean it cant use more compression but because it is built to be abused performance is not a prime concern.. JP5 , Diesel JP4, JP 8 and kerosine all have burn rates much slower than gasoline and also have MUCH higher resistance to knock and preignition.. thus it takes more compression PSI and staic compression ratio to efectivlly build it soly for HP..

    4-16-2014. 25 years old today... the fishin boat doesnt look to bad for a classic does she


    things that were are no longer as they are today...

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