Valve lash on all aluminum motors
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 28

Thread:
Valve lash on all aluminum motors

  1. #1
    Senior Member Ahsumtoy's Avatar
    Join Date
    Dec 2007
    Location
    Lake Havasu
    Posts
    1,001

    Default Valve lash on all aluminum motors

    How much lash do you subtract from the manufactures "hot" spec's when adjusting an all aluminum motor "cold"? In other words, how much do you compensate for heat expansion?

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    LP-25.com Infomaniac's Avatar
    Join Date
    Dec 2007
    Location
    New Port Richey, FL
    Posts
    16,855

    Default

    We subtract .010 aluminum block and heads.
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


    QE 439 Twin Turbo

  4. #3
    Senior Member ICECREAMAN's Avatar
    Join Date
    May 2009
    Posts
    2,426

    Default

    According to my Reher Morrison book it's .004. I did this way, then warmed my motor and rechecked adjustment just to verify and they were dead on.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member ICECREAMAN's Avatar
    Join Date
    May 2009
    Posts
    2,426

    Default

    From the book
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	valve adj.jpg 
Views:	109 
Size:	8.4 KB 
ID:	392537  

  7. #5
    Senior Member TNYoungblood's Avatar
    Join Date
    Mar 2010
    Location
    Clarksville, TN
    Posts
    5,104

    Default

    Foxwell told me to subtract .006. Iron block, lumi heads.
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

  8. #6
    Senior Member Itsahobby's Avatar
    Join Date
    Dec 2007
    Location
    San Jose Ca.
    Posts
    376

    Default

    Need to do my research before opening my big mouth. Checked around and found a few sites, including Crane:
    Click image for larger version. 

Name:	valvelash.jpg 
Views:	121 
Size:	26.9 KB 
ID:	392545
    I'll delete my post.
    Sorry for the confusion.
    --Jerry

  9. #7
    Senior Member 67weiman's Avatar
    Join Date
    Dec 2007
    Location
    Surprise, AZ
    Posts
    985

    Default

    Not to hijack the thread but, my cam card calls for .026 cold. Iron block, AL heads, should I be setting them different from the specs?

  10. #8
    Senior Member Ahsumtoy's Avatar
    Join Date
    Dec 2007
    Location
    Lake Havasu
    Posts
    1,001

    Default

    I was told by a very good source to subtract .010" Just wondered what others were doing

  11. #9
    gn7
    gn7 is offline
    Senior Member gn7's Avatar
    Join Date
    Jan 2008
    Posts
    25,975

    Default

    Like Info said, .010 is probably the number. .012 would probably be the number in a car.
    Either is within the range of a valve lash loop, but I would use .010 number.



    100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3

  12. #10
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Iron block, alum. heads, .006 has always seemed to be dead on from my experience. Only worked on a few all alum., engines and never did before/after hot/cold lash checks, but I'd start at .010 then check hot. Always check hot just to verify and .002" lash adjustment is more than I'd ignore.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  13. #11
    steelcomp was here
    Join Date
    Dec 2007
    Location
    n/e TN
    Posts
    26,269

    Default

    Quote Originally Posted by TNYoungblood View Post
    Foxwell told me to subtract .006. Iron block, lumi heads.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

  14. #12
    Highaboosta Unchained's Avatar
    Join Date
    Dec 2007
    Location
    Ada, Michigan
    Posts
    3,431

    Default

    I set them at .012 cold and I get .024 hot.

    Twin Turbo 1800 HP V-Drive lake boat

    http://s621.photobucket.com/albums/t...t=MAH05771.mp4

    Quote Originally Posted by Trigger View Post
    No one cares about your buddies old antiquated garden hose technology.
    Quote Originally Posted by MAXIMUS View Post
    I think I could run more boost but it's a real hand full right now

  15. #13
    Senior Member jimclauss's Avatar
    Join Date
    Jan 2011
    Location
    Mickleton, New Jersey
    Posts
    1,622

    Default

    Quote Originally Posted by Unchained View Post
    I set them at .012 cold and I get .024 hot.
    I never see this much of a change? Now Hot does it get? Are they Chev. or Big chief Heads?


    .
    Last edited by jimclauss; 10-05-2013 at 07:45 PM.

  16. #14
    Senior Member 65BEAVER's Avatar
    Join Date
    Nov 2008
    Location
    livonia mi
    Posts
    109

    Default

    Deck height, and the quality of the alum. I know this guy got his answer but I have some that are .002 cold .020 hot. A lot of junk I do is 11.6-12.0 deck. Billet blocks and heads grow way less than cast. Just my 2 cents don't need to stir the pot.

+ 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