Valve lash ?
+ Reply to Thread
Page 1 of 5 1 2 3 4 ... LastLast
Results 1 to 14 of 60

Thread:
Valve lash ?

  1. #1
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default Valve lash ?

    My solid roller cam is supposed to have lash set at .020 on the intake and .020 on the exhaust when it's hot. Where's it supposed to be set at when cold? (First time being run if it matters.) Thanks!

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Cantard 71hallett's Avatar
    Join Date
    Mar 2008
    Location
    snow bank
    Posts
    5,017

    Default

    I would just set them at 20 then reset them when it,s hot.
    my .02
    Paul
    Quote Originally Posted by gn7 View Post
    It would be a balmy 85* in Steel's shop if he would move a little faster

  4. #3
    Just another Wannabe Wannabe's Avatar
    Join Date
    Jan 2008
    Posts
    1,187

    Default

    Every engine grows different. If it has a standard deck iron block and fairly stock iron heads, the growth is usually minimal. .002 or so. Aluminum heads grow more. (around .002- .003 more than with iron heads.) Tall deck blocks grow more and WOW when you get to tall deck aluminum blocks with aluminum heads.
    Just guess what they may be, but keep a good record. Then measure it when it has been hot for a while and that is the only foolproof way to test each individual engines growth.

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default

    Iron block with aluminum heads. So it sounds like they expand when they get hot (I should have known that). Maybe set them at .023 cold and then after running it for a while check it when it's hot?

  7. #5
    Boat Nut sleekcrafter's Avatar
    Join Date
    Dec 2007
    Location
    South Elgin, Il.
    Posts
    5,131

    Default

    Quote Originally Posted by hotrod56cars View Post
    Iron block with aluminum heads. So it sounds like they expand when they get hot (I should have known that). Maybe set them at .023 cold and then after running it for a while check it when it's hot?
    The engine is growing height wise, so you would subtract from the .020
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  8. #6
    mo balls than $cents$ IMPATIENT 1's Avatar
    Join Date
    Dec 2007
    Location
    hugo,okla
    Posts
    11,733

    Default

    Quote Originally Posted by hotrod56cars View Post
    Iron block with aluminum heads. So it sounds like they expand when they get hot (I should have known that). Maybe set them at .023 cold and then after running it for a while check it when it's hot?
    my cam calls for 20 also, i set em 22 cold, and i've checked them hot. the 20 was tight but fine. also runnin iron block,alum heads.

  9. #7
    Just another Wannabe Wannabe's Avatar
    Join Date
    Jan 2008
    Posts
    1,187

    Default

    Every iron block and aluminum headded deal I have ever ran wants to be about 4 to 5 thou tighter when it is cold. I would try about .016 to .017 cold. Then check it when it is hot. Every engine is a little different. And every engine also wants to run at different temperatures and as such, different amounts of growth.

  10. #8
    Resident Ford Nut Sleeper CP's Avatar
    Join Date
    Dec 2007
    Location
    San Diego County
    Posts
    10,074

    Default

    Quote Originally Posted by hotrod56cars View Post
    Iron block with aluminum heads. So it sounds like they expand when they get hot (I should have known that). Maybe set them at .023 cold and then after running it for a while check it when it's hot?
    The clearance should "grow" .002-.004 from cold to hot. Set at .018 cold should be about .020-.021 hot.

    The Alumi heads on the 565" grow and change the valve lash from .024 cold the .026 hot.

    You guy's got me scratching my head there for a minute.

    Sleeper 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"

  11. #9
    Senior Member hotbo's Avatar
    Join Date
    Feb 2008
    Location
    lake Ouachita AR
    Posts
    4,677

    Default

    stock cast block with aluminum heads.i se them 4thousandths tighter cold.say .020 i se them .016

    iron heads i set them 2 thousandths tighteri have checked several motors when hot and they always seem to be right on or close to it.good luck.travis

  12. #10
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default

    The guy that's putting the engine together for me said he wasn't sure if he could make it out until Sunday evening to finish my engine. I don't have anything to do until he's done. I don't have side work, 8 -5 work, nothing. So I started thinking I should just finish it myself. So I started this thread. He'll be out here in less than an hour to finish my engine. Thanks for the replies!!!

    Makes me wonder if anyone saw this thread...

  13. #11
    Resident Ford Nut Sleeper CP's Avatar
    Join Date
    Dec 2007
    Location
    San Diego County
    Posts
    10,074

    Default

    Quote Originally Posted by hotrod56cars View Post
    So I started thinking I should just finish it myself. So I started this thread. He'll be out here in less than an hour to finish my engine. Thanks for the replies!!!

    Makes me wonder if anyone saw this thread...
    So, will you be using the EOIC ( or what ever it is) method or TDC ?

    Sleeper 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"

  14. #12
    Banned
    Join Date
    Jan 2008
    Location
    El Cajon, CA.
    Posts
    3,605

    Default

    Quote Originally Posted by Sleeper CP View Post
    So, will you be using the EOIC ( or what ever it is) method or TDC ?

    Sleeper CP
    uh uh uhmmm... what?

  15. #13
    Senior Member ol guy's Avatar
    Join Date
    Mar 2008
    Location
    Lake Elsinore Ca
    Posts
    3,840

    Default

    Set the intake at .022 and the exhaust at .024.Recheck after a real good warm-up. Please remember that aluminum heads require more heat to work and conform to a iron block. 195 running temp is okay. I may be wrong here but when was the last time you saw a REAL race care with a radiator??? For that matter what does the temp gauge say on a daily driver with aluminum heads say... I know the gauge doesn't say any thing you have to read it!!!!!!!!!!!! IMO. M

  16. #14
    CarbGuy RumRunner's Avatar
    Join Date
    Jul 2008
    Location
    Lake Lanier
    Posts
    80

    Default

    Quote Originally Posted by ol guy View Post
    I may be wrong here but when was the last time you saw a REAL race care with a radiator???

    Every Cup car out there, Every Pro-Stock car out there ALL have Radiators. There are a couple of Drag Race classes that run solid (no water) blocks but the overwhelming majority run water, and radiators.

    As far as the temp they run it depends on what you're trying to do, but the colder they run the better they perform in a RACE only application. Pro-Stock cars will be about 100° to 110° at the end of a run.

+ Reply to Thread
Page 1 of 5 1 2 3 4 ... 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