Page 1 of 2 12 LastLast
Results 1 to 20 of 26
  1. #1
    Member K-DAWG's Avatar
    Join Date
    Apr 2007
    Location
    Kingsland, GA
    Posts
    6,635

    Mercury 300 505 Lbs 4.6 litrer V-8!!


  2.  
  3. Member
    Join Date
    Dec 2015
    Location
    Decatur, Alabama
    Posts
    509
    #2
    Spec's look pretty impressive. I figure the awful shape of the motor will grow on us. For now though its a bit on the "ugly blind date" side of my thinking.

  4. Member River Rocket's Avatar
    Join Date
    Jul 2004
    Location
    Blaine, MN
    Posts
    689
    #3
    I photoshopped one on my boat when they first showed the 225. I thought it was going to be hideous. I ended liking it. I will post Later.
    21' Allison XB-21 ProSport 300XS



  5. Member
    Join Date
    Aug 2006
    Location
    Danbury, CT
    Posts
    1,996
    #4
    Power will overtake ugliness lol
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  6. Member K-DAWG's Avatar
    Join Date
    Apr 2007
    Location
    Kingsland, GA
    Posts
    6,635
    #5
    So, it they can flash a 4.2 liter V-6 SHO to 347 flywheel HP. How much will they get out of a 4.6 liter V-8 when they break the code? Any guess on peak HP and Torque?

  7. Member myron's Avatar
    Join Date
    Dec 2007
    Location
    Melbourne
    Posts
    274
    #6
    I did not see a sportmaster listed for a gearcase

  8. Member
    Join Date
    Jan 2007
    Location
    Johannesburg
    Posts
    219
    #7
    I like the look.......The old Square Box V6 Opti Pro XS has aged.
    Now, where does one get a Performance Tuner so that you can HEAR that V-8 Rumble when on the Fly :)
    Steve Engelbrecht - Johannesburg, South Africa
    Ranger Z21, Yamaha V-Max HPDI 300, Minnkota, Lowrance HDS and Elite-Ti

  9. Member
    Join Date
    Nov 2010
    Location
    Dallas
    Posts
    3,229
    #8
    Quote Originally Posted by myron View Post
    I did not see a sportmaster listed for a gearcase
    They might have it in the racing division V8’s or they just may not have listed it.

  10. Member fishnfireman's Avatar
    Join Date
    Apr 2005
    Location
    Amarillo
    Posts
    6,482
    #9
    Dry weight *Lightest model available
    • 505 lbs / 229 kgs






  11. Member
    Join Date
    May 2007
    Location
    slo
    Posts
    830
    #10

  12. Member
    Join Date
    Dec 2005
    Location
    kokomo
    Posts
    900
    #11
    Its says the 250r is 520lbs but the 300r is 512lbs..

  13. Member
    Join Date
    Oct 2015
    Location
    Iowa
    Posts
    188
    #12
    Over on S&f supposedly the 300R went 103 on a bullet 21. 6400 limiter. This motor could be the ticket on a Xb 21

  14. Member
    Join Date
    May 2007
    Location
    slo
    Posts
    830
    #13
    The 300R has a different intake manifold. Short runner vs long runner.

    Quote Originally Posted by basser38 View Post
    Its says the 250r is 520lbs but the 300r is 512lbs..

  15. Member
    Join Date
    Nov 2010
    Location
    Dallas
    Posts
    3,229
    #14
    Those Pro XS and R Series engines sure sound good.



    http://www.mercuryracing.com/wp-cont...R_05_14_18.pdf


    Last edited by Sports1; 05-19-2018 at 07:55 AM.

  16. Member 22R's Avatar
    Join Date
    Jul 2006
    Location
    St. Amant
    Posts
    562
    #15
    Quote Originally Posted by Sports1 View Post
    Those Pro XS and R Series engines sure sound good.



    http://www.mercuryracing.com/wp-cont...R_05_14_18.pdf
    Dude ! get a console

    22R



    Allison XB2002 / Merc 150 XR6

  17. Member
    Join Date
    Dec 2015
    Location
    Decatur, Alabama
    Posts
    509
    #16
    Quote Originally Posted by JCSmile View Post
    Over on S&f supposedly the 300R went 103 on a bullet 21. 6400 limiter. This motor could be the ticket on a Xb 21
    Paul Nichols ran the 103. He said it had more in it but couldn't get it propped right on short notice.

  18. Member
    Join Date
    Aug 2006
    Location
    Danbury, CT
    Posts
    1,996
    #17
    Quote Originally Posted by Johnny Maxwell View Post
    Paul Nichols ran the 103. He said it had more in it but couldn't get it propped right on short notice.
    Wasn't that a $5,000 prop?
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  19. Member River Rocket's Avatar
    Join Date
    Jul 2004
    Location
    Blaine, MN
    Posts
    689
    #18
    Not sure I see the correlation between the prop price and speed. I have and have tried $1000 props that get out run by the stock Promax. If I had your magic Promax I could be even better off.
    21' Allison XB-21 ProSport 300XS



  20. Member
    Join Date
    Aug 2006
    Location
    Danbury, CT
    Posts
    1,996
    #19
    Quote Originally Posted by River Rocket View Post
    Not sure I see the correlation between the prop price and speed. I have and have tried $1000 props that get out run by the stock Promax. If I had your magic Promax I could be even better off.
    My point is there may be an issue getting these new motors propped right lol

    I can imagine your boat would do well with my "magic" 28 Promax! The 30 is still on the boat now...
    Allison XB21 Prosport Mercury Racing 250XS with a 1.75 Sporty

  21. Member
    Join Date
    Jul 2015
    Location
    Chattanooga
    Posts
    198
    #20
    When I ran the 32 Promax, 32 Pro ET and the 32 CNC prop they all ran the same speed on the rev limiter at 99 mph. We went with a 34 CNC prop because they don't make a 34 Promax prop or a 34 Pro ET.

Page 1 of 2 12 LastLast