compression question
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 18

Thread:
compression question

  1. #1
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default compression question

    ok guys I got one for yall,
    I got a 1973 Wriedt with a 460 BB in it, and i was runing wide open accross the lake bout 7am when the water was like glass, and then all of a sudden the engine ran hot and shut down on me, it wouldnt even turn over so i let it set for bout 45 minutes to let it air cool then hooked my bilge pump to it and run water through the engine to get it cool, fired it up drove it back to dock, brought it home and did a compression check one side of engine (all 4 cylinders) is runing 125 lbs of compression, the other side 1 cylinder 75 lbs other 3 cylinders 55 lbs, no water in oil and spark plugs are clean (no oil on them) so is it a head problem? or a cylinder problem? if it was a cylinder wouldnt my plugs have oil on them? and if it was a head problem wouldnt I have water in my oil?

    any help would be greatfull

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2

    Join Date
    Jan 2009
    Posts
    283

    Default

    Sounds like blown head gasket! Between cylinders.

  4. #3
    Senior Member GT Jets's Avatar
    Join Date
    Jun 2008
    Location
    Morgan Hill
    Posts
    2,234

    Default

    I would be willing to bet you have a blown head gasket in the low head, also, did you have the throttle butterflies 100% open when you did the test?. Could be giving you some bad #'s otherwise.

    Good luck!

    GT
    GT


    Quote Originally Posted by Quickjet View Post
    Put a 300 on the back of it, Flywheel it and a nosecone. $15,000 later you'll have a 65 mph pile of shit......

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default

    forgot to mention that there's some blow by on the vent in the valve covers....blown head gasket would be great, i was thinking the worse....... no i didnt hav the butterflies open whe i did it but i"ll try it..........thanks

    will it hurt to finish out the summer like it is or does it need replaced asap????????????
    Last edited by hillbilly68; 07-05-2009 at 02:35 PM.

  7. #5
    Senior Member
    Join Date
    Dec 2007
    Location
    Iuka, Mississippi 38852
    Posts
    598

    Default

    A.S.A.P. or sooner. Period. With 4 weak cylinders on one side theres something major going on. You`ll be lucky if its just a head gasket.

  8. #6
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default

    what do you think it is, richard?

  9. #7
    Resident Ford Nut Sleeper CP's Avatar
    Join Date
    Dec 2007
    Location
    San Diego County
    Posts
    10,072

    Default

    Quote Originally Posted by hillbilly68 View Post
    ok guys I got one for yall,
    I got a 1973 Wriedt with a 460 BB in it, and i was runing wide open accross the lake bout 7am when the water was like glass, and then all of a sudden the engine ran hot and shut down on me,

    While it's apart check the pin in the dizzy to make sure it's not sheared or at least started to shear. When they let go in the boat the ignition retards the exhaust gets hot as hell, the engine shuts down and it won't start.

    So check it out while you're working on things. Your compression loss is a much bigger problem

    S CP

    "Dark Sarcasm"
    Going fast is only half the fun ... what you make go
    fast is the other half.
    " A Government big enough to give you everything you want is big enough to take away everything you have"

  10. #8
    Senior Member 1975sleekcraft's Avatar
    Join Date
    Jun 2008
    Location
    seattle
    Posts
    393

    Default sucked valves

    i recently had a similar deal, but mine hit 0 compression on a couple cylinders!!

    i am just wondering if yours could be partially tuliped?????

    if your taking the heads off anyway, make sure your valves are alright!!

  11. #9
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default

    it still runs good, i couldnt tell that there was low compression till i did the check

  12. #10

    Join Date
    Jul 2008
    Posts
    200

    Default

    I would take it apart and change bearings,rings, etc while it still runs. Save yourself some major problems. 460 Ty's don't like over heating let alone seizing.
    I would bet that parts are crystallized from that ride.

  13. #11
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default

    pulled spark plug and put 120 lbs air pressure into it and it held, no air coming from valve cover so i know the rings are good, i pulled the head off and found the head gasket does have a couple bad places in it, so, hopefully that was my problem, previous owner used a normal head gasket, i going to put a high dollar marine gasket in and see if that wont fix it...........

  14. #12
    058
    058 is offline
    Senior Member
    Join Date
    Dec 2007
    Posts
    4,115

    Default

    Quote Originally Posted by hillbilly68 View Post
    pulled spark plug and put 120 lbs air pressure into it and it held, no air coming from valve cover so i know the rings are good, i pulled the head off and found the head gasket does have a couple bad places in it, so, hopefully that was my problem, previous owner used a normal head gasket, i going to put a high dollar marine gasket in and see if that wont fix it...........
    Have the heads surfaced before installing the new head gaskets. If it got hot there is a good chance the heads are warped and if you just change gaskets only you will be changing them again very soon.
    Within the heart of every stray lies the singular desire to be loved. "Good grief you're an irritating blowhard...." [Tex 6/16/11]

  15. #13
    Sit N' Spin Jetaholic's Avatar
    Join Date
    Dec 2007
    Location
    Droppin' the kids off at the pool
    Posts
    1,423

    Default

    Quote Originally Posted by Sleeper CP View Post
    While it's apart check the pin in the dizzy to make sure it's not sheared or at least started to shear. When they let go in the boat the ignition retards the exhaust gets hot as hell, the engine shuts down and it won't start.

    So check it out while you're working on things. Your compression loss is a much bigger problem

    S CP
    This post is useless without charts!



    Quote Originally Posted by HammerDown
    Kendall L-427 Super Blu...extreme-pressure (ep) lithium complex keeps my thrusting balls happy
    Quote Originally Posted by back2k5 View Post
    Well I am putting in a nice stereo system in the Carrera...maybe Ill put on some rap and turn the scoop sideways

  16. #14
    Senior Member hillbilly68's Avatar
    Join Date
    Jun 2009
    Location
    Searcy, AR.
    Posts
    1,282

    Default

    well guys, got the heads pulled off and the side with low compression found 2 cracks and a seat that was fixing to fall out, 1 crack (between intake valve and exhaust valve was a minor one that could be repaired but when we saw the 2nd crack its beyond repair (another boat anchor) so i found some heads on ebay (cheap) and a buddy of mine owns a head shop and i handed them over to him, did a valve job and worked them over a lil hint hint...... got it put together today and it sounds sweet so looks like yall going to have to put up with me at okmulgee cause I'll be there now...................

+ Reply to Thread
Page 1 of 2 1 2 LastLast

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Please select your insurance company (Optional)

Log-in


Tags for this Thread

Digg This Thread

Posting Permissions

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95