Results 1 to 4 of 4

Thread: 4bd1 cylinder compression

  1. 7th April 2012, 01:28 PM #1
    fid-def's Avatar
    fid-def
    fid-def is offline Master
    Join Date
    Jan 1970
    Location
    !ower hunter
    Posts
    107
    Total Downloaded
    0

    4bd1 cylinder compression

    An anyone tell me the cylinder pressure of a 4 bd1 with engine running I've just checked mine at the heater plugs and am getting 615 psi - haven't checked by manual hand turning. I can't find details in forum search.
    Reply With Quote Reply With Quote
  2. 7th April 2012, 02:40 PM #2
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,495
    Total Downloaded
    0
    dunno, never tried it with the engine running...

    270ish PSI from memory on the starter with all the glow plugs pulled and the IP held in the stop position.

    (compression ratio*15)
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
    Reply With Quote Reply With Quote
  3. 7th April 2012, 03:08 PM #3
    Dougal
    Dougal is offline ForumSage
    Join Date
    Sep 2007
    Location
    Kiwiland
    Posts
    7,246
    Total Downloaded
    0
    Quote Originally Posted by Blknight.aus View Post
    (compression ratio*15)
    Plus heat from compression. Compress it slowly without leakage and you'll get compression ratio x 15.
    Reply With Quote Reply With Quote
  4. 7th April 2012, 04:22 PM #4
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
    Join Date
    Aug 2006
    Location
    Melbourn(ish)
    Posts
    26,495
    Total Downloaded
    0
    correct and theres a rule for working that out too.....

    (buggered if I can remember it tho) I use compression*15 as a ball park for minimum pressure for a cold dry compression test, less is bad and the variation should be less than 10% from highest to lowest.

    same principle applies to combustion pressures when you're using that for fault finding its not so much the overall number (unless its stupidly off base) but the variation between that is most important.

    huuummnnn, aaaaahhnd as it is written in the good book chapter 103 verse 31, 313-441PSi with 71psi max variation, so shall it be...... ommnnnnnnnn
    Attached Images Attached Images
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
    Reply With Quote Reply With Quote
« Fitted hid lights to D1 | making your own suspension components? »

Bookmarks

Bookmarks

Posting Permissions

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

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!