User Tag List

Results 1 to 9 of 9
  1. #1
    Join Date
    Aug 2020
    Location
    Dickson, Tennessee
    Posts
    331
    Thanks (Given)
    35
    Thanks (Received)
    26
    Likes (Given)
    616
    Likes (Received)
    245
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    '87 2.4L CARB to EFI conversion?

    I have complete Laser EFI system from a '98 200HP. I just had a guy ask me a question that I don't have the answer to and hoping you guys do. The guy has an '87 2.4L and is wanting to convert it to EFI if its possible. Would a 2.5L Laser setup bolt on? In my mind the only thing keeping it from working would be the reed plate but I'm not entirely sure. I definitely don't want to sell it to him if it wont work. Your experience is much appreciated!
    Last edited by Smalltownbassin; 02-26-2021 at 07:36 AM. Reason: spelling
    "The character of a man can be easily judged by how he treats those who can do nothing for him"

  2. #2
    Join Date
    Nov 2011
    Location
    Houston, TX
    Posts
    1,239
    Thanks (Given)
    164
    Thanks (Received)
    54
    Likes (Given)
    761
    Likes (Received)
    185
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    subscribed
    1990 Shadow bass boat w/ 2.4 200 Merc. Totally resto'd boat and love it!

  3. Likes Smalltownbassin liked this post
  4. #3
    Join Date
    Aug 2020
    Location
    Dickson, Tennessee
    Posts
    331
    Thanks (Given)
    35
    Thanks (Received)
    26
    Likes (Given)
    616
    Likes (Received)
    245
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by rgsauger View Post
    subscribed
    Just to fill you in on what i read in some of the archives, it all depends on the reed configuration. Vertical reeds = NOPE, horizontal reeds = MAYBE but only after slotting the holes in the 2.5 plate to bolt to the 2.4 front half. But i really dont know. The archived thread that i got that info from had nothing to do with an EFI conversion. It was more focused on powerhead swapping so hopefully someone can provide a definite answer.
    "The character of a man can be easily judged by how he treats those who can do nothing for him"

  5. #4
    Join Date
    Jul 2006
    Location
    Wisconsin
    Posts
    3,560
    Thanks (Given)
    447
    Thanks (Received)
    381
    Likes (Given)
    4925
    Likes (Received)
    3652
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Bolting it on is one thing, getting it to run right is another. Things to find out:
    -The ECU (fuel curve)" must be different; fuel curve mirrors the torque curve on most engines and the 2.4L & 2.5L are different?
    -Ignition timing curve is probably different too but the knock sensor might keep you out of trouble?
    -The 9-amp or 16-amp 2.4L carb charging system might not be adequate to run the EFI and electric fuel pump?
    There are people here who work on these all the time that will know the answers.

  6. Thanks Smalltownbassin thanked for this post
    Likes Smalltownbassin, coffeeguy, rock liked this post
  7. #5
    Join Date
    Aug 2020
    Location
    Dickson, Tennessee
    Posts
    331
    Thanks (Given)
    35
    Thanks (Received)
    26
    Likes (Given)
    616
    Likes (Received)
    245
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Btt
    "The character of a man can be easily judged by how he treats those who can do nothing for him"

  8. #6
    Join Date
    Apr 2001
    Location
    St. Amant, LA
    Posts
    252
    Thanks (Given)
    111
    Thanks (Received)
    36
    Likes (Given)
    357
    Likes (Received)
    205
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Interesting subject. I would call someone like Jay Smith who can probably tell you exactly what will or won't work then post here so we will all know.

    22R

  9. Likes Smalltownbassin liked this post
  10. #7
    Join Date
    Sep 2001
    Location
    Pekin, IL
    Posts
    8,864
    Thanks (Given)
    398
    Thanks (Received)
    458
    Likes (Given)
    1774
    Likes (Received)
    2895
    Mentioned
    5 Post(s)
    Tagged
    0 Thread(s)
    I know there is a difference cuz the 2.4 laser ecu has 2.4 cast into the front of it. Was told years ago the 2.4 will not work correctly on a 2.5 so my best guess is he above info is correct. I think Tony Brucato could answer your question.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  11. Likes David - WI, Smalltownbassin liked this post
  12. #8
    Join Date
    Sep 2006
    Location
    Key Largo, Fl
    Posts
    3,159
    Thanks (Given)
    8
    Thanks (Received)
    162
    Likes (Given)
    24
    Likes (Received)
    441
    Mentioned
    1 Post(s)
    Tagged
    1 Thread(s)
    Slotting the mounting holes on the center intake bolts will allow it to bolt up.Injectors are the same,but the 2.5 ECU will not run properly...Need a 220 2.4 Laser ECU.The 87 2.4 should have a 16 amp stator,adequate to run the efi system...

  13. Thanks Smalltownbassin thanked for this post
    Likes Smalltownbassin liked this post
  14. #9
    Join Date
    Aug 2020
    Location
    Dickson, Tennessee
    Posts
    331
    Thanks (Given)
    35
    Thanks (Received)
    26
    Likes (Given)
    616
    Likes (Received)
    245
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by ChrisCarsonMarine View Post
    Slotting the mounting holes on the center intake bolts will allow it to bolt up.Injectors are the same,but the 2.5 ECU will not run properly...Need a 220 2.4 Laser ECU.The 87 2.4 should have a 16 amp stator,adequate to run the efi system...
    Thanks Chris! I think everyone thats commented has given me enough info to tell the guy it wouldnt be an easy enough retrofit to make it worth his money.
    "The character of a man can be easily judged by how he treats those who can do nothing for him"

Similar Threads

  1. Efi to carb conversion
    By skatermike24 in forum Technical Discussion
    Replies: 5
    Last Post: 01-07-2015, 07:37 AM
  2. Mercury Tech: EFI to Carb conversion
    By ctered in forum Technical Discussion
    Replies: 2
    Last Post: 08-01-2010, 11:45 AM
  3. 2.4 CARB to 2.5 260 EFI Conversion?
    By LikwidCourage in forum Technical Discussion
    Replies: 5
    Last Post: 08-10-2006, 06:41 PM
  4. wmv carb conversion on xr6
    By diskvalve in forum Technical Discussion
    Replies: 5
    Last Post: 09-02-2004, 06:58 PM
  5. Carb to EFI conversion
    By h2oski in forum Technical Discussion
    Replies: 1
    Last Post: 11-19-2003, 03:08 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
  •  
Aeromarine Research