Results 1 to 8 of 8
  1. #1
    Join Date
    Apr 2009
    Location
    Joshua tree, ca
    Posts
    272
    Chats
    6

    Default 89 jeep wagoneer limited 4.0 bored 0.030 over

    i have a 4.0 engine and its bored 30 over i was wondering if someone might know what the make the engine now? its more then a 4.0 now since the bore.

  2. #2
    Join Date
    Mar 2009
    Location
    South TEXAS
    Posts
    7,244
    Chats
    3

    Default

    Call it a 4.2L then. That would be close and they do round the numbers up.

  3. #3
    Join Date
    Apr 2009
    Location
    Joshua tree, ca
    Posts
    272
    Chats
    6

    Default

    also how much horse power would this give also torque?

  4. #4
    Join Date
    Mar 2009
    Location
    South TEXAS
    Posts
    7,244
    Chats
    3

    Default

    Doubtful they would change unless they decreased since you are not pulling in any additional air/fuel mixture to ignite and the combustion chamber has now increased in size.

  5. #5
    Join Date
    Apr 2009
    Location
    Joshua tree, ca
    Posts
    272
    Chats
    6

    Default

    so what can i do to gain back the power i'm loosing?

  6. #6
    Join Date
    Mar 2009
    Location
    South TEXAS
    Posts
    7,244
    Chats
    3

    Default

    Bored TB or a supercharger. Big bucks either way but a substantial power gain b/c you are stuffing more burnable air/fuel in the same space and when ignited will cause more power release due to the sheer quantity of hydrocarbons being burned.

  7. #7
    Join Date
    Apr 2009
    Location
    Joshua tree, ca
    Posts
    272
    Chats
    6

    Default

    how do you bore the throttle body? would a throttle body spacer help?

  8. #8
    Join Date
    Mar 2009
    Location
    South TEXAS
    Posts
    7,244
    Chats
    3

    Default

    There are companies that do that boring. There is much debate over the spacer doing any good. In theory it has the potential to increase the volume and also the velocity of the incoming air charge but it is quite small and also would only be significant at a higher speed but it also couldn't hurt the mixture. We have a member who could address that more directly as he made some spacers and undoubedly tested them. Leave him a PM and he may be able to more fully answer your questions about spacers. He is HowlerGT.

Similar Threads

  1. 89 jeep wagoneer limited hesitates at take off
    By greenchevy in forum OEM/Factory
    Replies: 5
    Last Post: 10-05-2010, 04:05 PM
  2. 89 wagoneer limited. hessitates
    By greenchevy in forum OEM/Factory
    Replies: 3
    Last Post: 09-05-2010, 11:55 AM
  3. My Rigs - '00 XJ Limited and '01 XJ Limited
    By 2000XJ in forum Rig Pictures
    Replies: 18
    Last Post: 01-04-2010, 09:18 PM
  4. Got bored today
    By Dirt Dogg Rydas in forum General Talk
    Replies: 8
    Last Post: 10-28-2009, 04:19 PM
  5. 1990 Jeep Wagoneer XJ.
    By WagoneerCrawler in forum Modified
    Replies: 1
    Last Post: 06-27-2009, 05:20 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
  •