[Question] Curious on People's Thoughts
Page 1 of 2 1 2 LastLast
Results 1 to 14 of 17

Thread:
Curious on People's Thoughts

  1. #1
    Member
    Join Date
    May 2016
    Posts
    31

    Default Curious on People's Thoughts

    I have this build in the works right now. Just wondering what everyone thinks how much power it's gonna make.

    496BBC 4-bolt
    Scat rotating assembly
    JE 18cc dome pistons
    Brodix BB2 Plus heads
    Comp 1.8 ratio roller rockers
    Comp Cam: 285/295...254/264 @ .50... .638/.622 lift 108 LSA
    2.25 valves
    Weiand tunnel ram port matched to the heads
    2 Holley 830 DP

    Thanks for the help in advance!



    Sent from my iPhone using Tapatalk
    Quick reply to this message Reply  

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member
    Join Date
    Dec 2007
    Location
    Tri-Cities, TN
    Posts
    1,676

    Default

    Quote Originally Posted by lvilla03 View Post
    I have this build in the works right now. Just wondering what everyone thinks how much power it's gonna make.

    496BBC 4-bolt
    Scat rotating assembly
    JE 18cc dome pistons
    Brodix BB2 Plus heads
    Comp 1.8 ratio roller rockers
    Comp Cam: 285/295...254/264 @ .50... .638/.622 lift 108 LSA
    2.25 valves
    Weiand tunnel ram port matched to the heads
    2 Holley 830 DP

    Thanks for the help in advance!




    Sent from my iPhone using Tapatalk

    Large heads for CID if you max rpm is 6500 or less. I would lash intake .004" looser then what card says and the exhaust .006" tighter. Degree ICL to 103.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW
    Quick reply to this message Reply  

  4. #3
    Member
    Join Date
    May 2016
    Posts
    31

    Default

    Quote Originally Posted by cstraub View Post
    Large heads for CID if you max rpm is 6500 or less. I would lash intake .004" looser then what card says and the exhaust .006" tighter. Degree ICL to 103.
    What does making the lash tighter on the exhaust do?


    Sent from my iPhone using Tapatalk
    Quick reply to this message Reply  

  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member
    Join Date
    Dec 2007
    Location
    Tri-Cities, TN
    Posts
    1,676

    Default

    Quote Originally Posted by lvilla03 View Post
    What does making the lash tighter on the exhaust do?


    Sent from my iPhone using Tapatalk
    Increases the duration of the lobe.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW
    Quick reply to this message Reply  

  7. #5
    Already miss the 310/562 2manymustangs's Avatar
    Join Date
    Jan 2008
    Posts
    13,551

    Default

    Our dearly departed GN7 used to say that valve lash adjustments are one of the best tuning tools in the toolbox (assuming he meant solid lifters)...

    I don't recall his exact words but that is the gist of it...



    *********

    As a side note from our best friend FC Pilot:

    I often like to set mine a touch tighter than advertised as it will set the valve on the seat a little softer than if I am a little too loose. That keeps the seats from getting beat up and helps to prevent bounce. Especially if your springs are tired.

    As for as setting them goes, the more you do it the faster and more consistent you get. Practice does not make perfect, it makes permanent. So if you learn to do it by doing "shortcuts" or doing it wrong you will just have the wrong way engrained in you. I take the time to do "intake closing, exhaust opening" and have developed a good feel for the feeler gauge and dealing with Poli-locks so I am decent at it. If there is someone near by you take your engine or boat over and have them teach you. Having someone help you with hands on training is invaluable.

    Paul
    Last edited by 2manymustangs; 10-30-2017 at 09:58 AM.
    Pat Eason, the voice of reason...
    Quick reply to this message Reply  

  8. #6
    Village Idiot fc-Pilot's Avatar
    Join Date
    Jan 2008
    Location
    Peoria, AZ
    Posts
    3,268

    Default

    Quote Originally Posted by 2manymustangs View Post
    Our dearly departed GN7 used to say that valve lash adjustments are one of the best tuning tools in the toolbox (assuming he meant solid lifters)...

    I don't recall his exact words but that is the gist of it...



    *********

    As a side note from our best friend FC Pilot:

    I often like to set mine a touch tighter than advertised as it will set the valve on the seat a little softer than if I am a little too loose. That keeps the seats from getting beat up and helps to prevent bounce. Especially if your springs are tired.

    As for as setting them goes, the more you do it the faster and more consistent you get. Practice does not make perfect, it makes permanent. So if you learn to do it by doing "shortcuts" or doing it wrong you will just have the wrong way engrained in you. I take the time to do "intake closing, exhaust opening" and have developed a good feel for the feeler gauge and dealing with Poli-locks so I am decent at it. If there is someone near by you take your engine or boat over and have them teach you. Having someone help you with hands on training is invaluable.

    Paul
    Thanks for quoting me. Since then I have learned that my first statement my not have been completely true (depending on the cam grinder). I have since learned that the lash ramp (the ramp that is designed for the lash of the valvetrain to be taken up) is longer than I may have originally thought, so there may be a really good safe margin for valve lash. (Again, depending on the grinder and the lobe family used). Chris would be a much better reference for this than I. I use his cams and defer to him. I still believe that I would rather be a little on the tight side than on the loose side, especially if I were running spring pressure that was on the lower side of the "safe" range.

    Paul
    Quick reply to this message Reply  

  9. #7
    Already miss the 310/562 2manymustangs's Avatar
    Join Date
    Jan 2008
    Posts
    13,551

    Default

    Quote Originally Posted by fc-Pilot View Post
    Thanks for quoting me. Since then I have learned that my first statement my not have been completely true (depending on the cam grinder). I have since learned that the lash ramp (the ramp that is designed for the lash of the valvetrain to be taken up) is longer than I may have originally thought, so there may be a really good safe margin for valve lash. (Again, depending on the grinder and the lobe family used). Chris would be a much better reference for this than I. I use his cams and defer to him. I still believe that I would rather be a little on the tight side than on the loose side, especially if I were running spring pressure that was on the lower side of the "safe" range.

    Paul
    sorry big feller...

    While on this topic, can we clarify COLD versus HOT for the Onlookers and also the effect of COLD versus HOT lash settings for block X or block Y or block Z or head X versus head Y versus head Z and what you folks have found?

    I know that the cam card will tell you a hard / fast spec for HOT or COLD lash settings BUT what variations do you guys find for the different parts combos (block, heads, shaft rockers like a jessel versus non shaft, etc, etc, etc, etc, etc).........

    I hope and pray all is well with the Miller crew, please tell POP I said hello...
    Pat Eason, the voice of reason...
    Quick reply to this message Reply  

  10. #8
    Village Idiot fc-Pilot's Avatar
    Join Date
    Jan 2008
    Location
    Peoria, AZ
    Posts
    3,268

    Default

    Quote Originally Posted by 2manymustangs View Post
    sorry big feller...

    While on this topic, can we clarify COLD versus HOT for the Onlookers and also the effect of COLD versus HOT lash settings for block X or block Y or block Z or head X versus head Y versus head Z and what you folks have found?

    I know that the cam card will tell you a hard / fast spec for HOT or COLD lash settings BUT what variations do you guys find for the different parts combos (block, heads, shaft rockers like a jessel versus non shaft, etc, etc, etc, etc, etc).........

    I hope and pray all is well with the Miller crew, please tell POP I said hello...
    I will tell him hello for you.

    I don't remember the specifics (as I leave these details to my brother) but I remember with our iron bowtie block and merlin heads the cold lash was a tiny smidge more loose cold than hot (maybe .001 to .002) and when we ran brodix heads they were tighter cold than hot (again, Buzzz remembers just how much on our combo). I hope he will jump in and share that info.

    Paul
    Quick reply to this message Reply  

  11. #9
    Member
    Join Date
    May 2016
    Posts
    31

    Default

    Quote Originally Posted by cstraub View Post
    Increases the duration of the lobe.
    Gotcha. Should I just use a different cam then? Or grind on this one and use my 1.7 rockers that I have laying around?


    Sent from my iPhone using Tapatalk
    Quick reply to this message Reply  

  12. #10
    Village Idiot fc-Pilot's Avatar
    Join Date
    Jan 2008
    Location
    Peoria, AZ
    Posts
    3,268

    Default

    Quote Originally Posted by lvilla03 View Post
    Gotcha. Should I just use a different cam then? Or grind on this one and use my 1.7 rockers that I have laying around?


    Sent from my iPhone using Tapatalk
    I can't read his mind, but I have heard him on a number of occasions recommend playing with lash before having a cam cut, as the info playing with lash points you in a direction to nailing down the best cam.

    Paul
    Quick reply to this message Reply  

  13. #11
    Member
    Join Date
    May 2016
    Posts
    31

    Default

    Quote Originally Posted by fc-Pilot View Post
    I can't read his mind, but I have heard him on a number of occasions recommend playing with lash before having a cam cut, as the info playing with lash points you in a direction to nailing down the best cam.

    Paul
    Right right. What are your thoughts Paul?


    Sent from my iPhone using Tapatalk
    Quick reply to this message Reply  

  14. #12
    Senior Member
    Join Date
    Dec 2007
    Location
    Tri-Cities, TN
    Posts
    1,676

    Default

    The I/E ratio on Brodix heads is low, therefore you need to cam accordingly. The exhaust port needs more time, duration, to evac the exhaust. These heads like around 14 degree split at .050". I was always the fat kid in gym class. I needed more time then others to run a 50 yard dash!!!!
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW
    Quick reply to this message Reply  

  15. #13
    Village Idiot fc-Pilot's Avatar
    Join Date
    Jan 2008
    Location
    Peoria, AZ
    Posts
    3,268

    Default

    Quote Originally Posted by lvilla03 View Post
    Right right. What are your thoughts Paul?
    My thoughts? My thought is that Chris forgot more about cams last night while sleeping than I have ever known. I do what he says and the dyno or timeslip confirms that he is most often right.

    ...and I am just another average goof ball so I don't really have enough experience to give incredibly detailed advice.

    Paul
    Quick reply to this message Reply  

  16. #14
    Member
    Join Date
    May 2016
    Posts
    31

    Default

    Quote Originally Posted by cstraub View Post
    The I/E ratio on Brodix heads is low, therefore you need to cam accordingly. The exhaust port needs more time, duration, to evac the exhaust. These heads like around 14 degree split at .050". I was always the fat kid in gym class. I needed more time then others to run a 50 yard dash!!!!
    So bump the exhaust up 4 more degrees


    Sent from my iPhone using Tapatalk
    Quick reply to this message Reply  

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

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