stringer rail engine mounts????
+ Reply to Thread
Results 1 to 12 of 12

Thread:
stringer rail engine mounts????

  1. #1
    Senior Member badbug3's Avatar
    Join Date
    Mar 2008
    Posts
    1,016

    Default stringer rail engine mounts????

    I always wanted to know the answer to this. Why is it that most all engine rail mounting is done with the rails bolted to the side of the stringers where all the load is placed on the bolts going through holes in the stringers???

    Seems like to me the best way would be to just lay the rails on top of the stringers and then through bolt them through the stringers and then most of the load is taken away from the bolts and the holes going through the stringers??? Also should stop the wearing out of the holes in the wood stringers!!!!!!!!

    Whats the deal with this???!!!!!!!!

  2. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  3. #2
    Senior Member lbhsbz's Avatar
    Join Date
    Oct 2008
    Location
    Long Beach
    Posts
    1,617

    Default

    Ideally, there should be no load on the bolt holes in the stringers...especially when you put a plate on the outside of the stringer instead of just stringer washers. The bolts are loaded in tension and should simply clamp the rails to the stringers. The clamping force should take all the load...and would if the stringers were not made of wood and were compressable. Most of the wear you see is most likely due to a decrease in the bolt tension over time due to the stringer compressing....need to check and retighten the rail bolts more often or add a plate to distribute the clamping force better over the entire stringer.

  4. #3
    Boat Nut sleekcrafter's Avatar
    Join Date
    Dec 2007
    Location
    South Elgin, Il.
    Posts
    5,131

    Default

    If the wood stays dry, and the glass does not delam, there is little issue. Seems somewhat common for the flat bottoms to have their rails over the stringer, just not done on jets for what ever.
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


  5. Remove Advertisements
    PerformanceBoats.com
    Advertisements
     

  6. #4
    Senior Member
    Join Date
    Jul 2008
    Location
    Kingman/Golden Vly, Az
    Posts
    1,278

    Default

    Quote Originally Posted by badbug3 View Post
    I always wanted to know the answer to this. Why is it that most all engine rail mounting is done with the rails bolted to the side of the stringers where all the load is placed on the bolts going through holes in the stringers???

    Seems like to me the best way would be to just lay the rails on top of the stringers and then through bolt them through the stringers and then most of the load is taken away from the bolts and the holes going through the stringers??? Also should stop the wearing out of the holes in the wood stringers!!!!!!!!

    Whats the deal with this???!!!!!!!!
    this is exactly the way my rail set-up is on the boat i'm slowly/surely building...they set on top of the stringers & a flat plate on the other side...the front & rear motor mount plates set on top of the rails with feet to the rails...i was lucky & found plates that would allow me to do this ...sometimes, if you cant find the right width plates, you have to opt for a different route to take...i think it is alot stronger set-up

    FastRat

  7. #5
    WFL Crew TINTDESIGNZ's Avatar
    Join Date
    Oct 2009
    Location
    East Texas
    Posts
    3,874

    Default

    I ordered my rail kit new from JBP and as you can see it has stringer plates for the outside of the stringer. Even with 1" stringers it is plenty strong!

    WFL CREW!
    http://www.performanceboats.com/cont...-magazine.html
    Everybody wants some...I want some too!

  8. #6
    Senior Member lbhsbz's Avatar
    Join Date
    Oct 2008
    Location
    Long Beach
    Posts
    1,617

    Default

    Quote Originally Posted by TINTDESIGNZ View Post
    I ordered my rail kit new from JBP and as you can see it has stringer plates for the outside of the stringer. Even with 1" stringers it is plenty strong!
    What diameter bolts does that setup use to hold the plates to the blocks?

  9. #7
    WFL Crew TINTDESIGNZ's Avatar
    Join Date
    Oct 2009
    Location
    East Texas
    Posts
    3,874

    Default

    3/8 i think.I went back and put purple stringer washers just for a little more bling. oh-you said blocks sorry.
    Last edited by TINTDESIGNZ; 08-27-2010 at 01:03 PM.

    WFL CREW!
    http://www.performanceboats.com/cont...-magazine.html
    Everybody wants some...I want some too!

  10. #8
    Living in a cage of fear thatguy's Avatar
    Join Date
    May 2008
    Location
    Redding, CA
    Posts
    16,461

    Default

    I have wanted to put rails in the Miller for a while now, but the stringers are very narrow.
    I think they would have to go over the stringers, or bolt to the outside?
    Otherwise it looks like top mount starter and a bunch more expense?
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

  11. #9
    Senior Member Mike D's Avatar
    Join Date
    Dec 2007
    Location
    Anaheim/Aha
    Posts
    2,638

    Default

    here is one over the rails

  12. #10
    Impeachment! 75 TX's Avatar
    Join Date
    Jul 2008
    Location
    Culver City, Ca
    Posts
    3,728

    Default

    Quote Originally Posted by thatguy View Post
    I have wanted to put rails in the Miller for a while now, but the stringers are very narrow.
    I think they would have to go over the stringers, or bolt to the outside?
    Otherwise it looks like top mount starter and a bunch more expense?
    The stringers themselves are narrow? Or the two stringers are close together?
    Here's how Jack setup my old Miller. No top mount starter, but I did use a Powermaster mini.
    The new (to me) boat's stringers are farther apart, necessitating new front and rear engine plates. Still have the ones from the Miller though.

  13. #11
    Senior Member jetboatperformance's Avatar
    Join Date
    Dec 2007
    Location
    Atascadero Calif
    Posts
    7,464

    Default

    Quote Originally Posted by thatguy View Post
    I have wanted to put rails in the Miller for a while now, but the stringers are very narrow.
    I think they would have to go over the stringers, or bolt to the outside?
    Otherwise it looks like top mount starter and a bunch more expense?
    Tommy the plates can be "knotched" and let to run wild over the tops of the stringers (1rst pic) or the motor plates can be custom cut (and edges polished)for specific stringer width's The rails simply need to be relieved for low mount starters Tom
    heres a few various recent installs including a Miller similar to yours



  14. #12
    Living in a cage of fear thatguy's Avatar
    Join Date
    May 2008
    Location
    Redding, CA
    Posts
    16,461

    Default

    Thanks TX and Tom.

    Tom, I'll probably want to have You and Josh do something this winter along these lines!
    Tommy
    Quote Originally Posted by Rexone View Post
    Tommy please remove all Jimsplace quotes from your sig and don't put more back. He doesn't like it and it is against the rules. Thank you.
    "So as through a glass, and darkly
    The age long strife I see
    Where I fought in many guises,
    Many names, but always me."

    Gen. George S Patton

+ Reply to Thread

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