Upcoming Events for the Next 20 Day(s)

Results 1 to 3 of 3

Thread: 204 Islander Prop Recommendation

  1. #1
    Baja Boat Owner
    Join Date
    Jun 2017
    Syracuse, New York

    1994 Baja Islander
    Thanked 0 Times in 0 Posts

    204 Islander Prop Recommendation

    Hey ya'll,

    So I need a suggestion on what size prop is right for my '93 Islander 204. It's got a V6 4.3L Mercruiser Alpha One, right now has a 21" pitch Mirage and am just curious if anyone has any experience with the boat and knows if this is the right size prop, what the optimum RPM range is, and what the top speed should be. We've topped it out at 42 mph...


  2. #2
    Baja Supporter tablerocker's Avatar
    Join Date
    Aug 2012
    near Wichita, Kansas, USA

    1992 Baja 208 Islander
    Thanked 846 Times in 585 Posts

    Re: 204 Islander Prop Recommendation

    Is this the two barrel or 4 barrel version? And what gear ratio on your outdrive? What rpm were you running at WOT?
    The flame arrestor cover (if still on the boat) should tell you the rpm range, but if my memory is correct you should be max 4600 rpm.

    I suspect you have a 1.84:1 ratio outdrive. The speed you show, if accurate (not on the wish-o-meter but GPS checked) is right on for a 21" running 4600 with 10% slip. However, it is also right on for a 1.65:1 ratio drive only running 4200 rpm.

    Regardless, you are right in the ballpark on your speed, with the 4.3 engine. The attached picture shows one place on an Alpha to check the ratio.
    Last edited by tablerocker; 07-11-2017 at 07:22 PM.
    Table Rock Lake is my home away from home, and big block power rules.

  3. The Following User Says Thank You to tablerocker For This Useful Post:

    JerseyOutlaw (07-11-2017)

  4. #3
    Baja Supporter JerseyOutlaw's Avatar
    Join Date
    Jul 2010
    Toms River, NJ

    2005 Baja 25 Outlaw, 525sc, Imco neutral box, Imco -3 Shorty, 380 K Planes, Full Hyd.
    Thanked 2,492 Times in 1,312 Posts

    Re: 204 Islander Prop Recommendation

    What he said ^

    Sent from my SM-G900V using Tapatalk
    "Fine Whine"

Similar Threads

  1. bought this prop for my 208 islander
    By maxyb13 in forum Prop Talk
    Replies: 6
    Last Post: 05-06-2017, 05:21 PM
  2. 208 Islander Prop recommendation
    By maxyb13 in forum Prop Talk
    Replies: 10
    Last Post: 05-02-2017, 06:59 PM
  3. 204 prop recommendation
    By miraboater in forum Prop Talk
    Replies: 8
    Last Post: 03-05-2017, 06:20 PM
  4. 232 Islander Prop
    By Rolmo in forum Prop Talk
    Replies: 7
    Last Post: 06-27-2014, 01:19 PM
  5. 252 Islander 496 Mag Prop
    By Bhobbs78 in forum Prop Talk
    Replies: 6
    Last Post: 06-27-2014, 01:05 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts