2000 zx12 stock rod hp rating

+ Reply to Thread
Results 1 to 8 of 8

2000 zx12 stock rod hp rating

This is a discussion about 2000 zx12 stock rod hp rating within the Kawasaki ZX12R-ZX14 section, where you will Kawasaki Kings of street and strip; i was woundering wat the hp rating is for stck rods. are carrillo rods necessary? are the stock rods the weak link on these motors or not. im gonna have mine pullin hard and up

  1. #1
    Moving up the Ladder

    Join Date
    Sep 2010
    Location
    Boone IA
    Posts
    141
    Post Thanks / Like
    Rep Power
    5
    Country: United States

    Default 2000 zx12 stock rod hp rating

    i was woundering wat the hp rating is for stck rods. are carrillo rods necessary? are the stock rods the weak link on these motors or not. im gonna have mine pullin hard and up on the revs so just curious if i dnt need them i wont buy them thanks

  2. Remove Advertisements
    PsychoBike.com
    Advertisements
     

  3. #2
    Moving up the Ladder

    Join Date
    Oct 2011
    Location
    shreveport la
    Posts
    106
    Post Thanks / Like
    Rep Power
    3

    Default

    what kind of hp? whats the set up? are you shooting nitrous? a little more info will help

  4. #3
    I Finally Registered

    Join Date
    Sep 2012
    Location
    Deltona FL
    Posts
    12
    Post Thanks / Like
    Rep Power
    0
    Country: Puerto Rico

    Default

    I sprayed 80 shot on my bike with stock rods and never had a problem.

  5. #4
    Moving up the Ladder

    Join Date
    Sep 2010
    Location
    Boone IA
    Posts
    141
    Post Thanks / Like
    Rep Power
    5
    Country: United States

    Default

    no nitrous its just a stock bore motor and gonna be run in dirt car dnt know the hp rating

  6. #5
    Moving up the Ladder

    Join Date
    Oct 2011
    Location
    shreveport la
    Posts
    106
    Post Thanks / Like
    Rep Power
    3

    Default

    stock rods will be good for that

  7. #6
    Moving up the Ladder

    Join Date
    Sep 2010
    Location
    Boone IA
    Posts
    141
    Post Thanks / Like
    Rep Power
    5
    Country: United States

    Default

    ok thanks for the imput

  8. #7
    Site Sponsor
    CompetitionCNC's Avatar
    Join Date
    May 2007
    Location
    CT
    Posts
    307
    Post Thanks / Like
    Real Name
    Jim Gilnack
    Rep Power
    0

    Default

    Thats a question that i get asked all the time.

    It's not really a HP issue. Its a load issue, more specifically a tension load issue.
    Rods don't break because they are put under compression loads due to increases in torque output.
    Pins might but rod beams and rod bolts don't.

    Rods break because either they starve for oil and get hot and break or the tension loads exceed the rods limits or the tension loads exceed the bolts limits.

    The heat issue is usually due to lack of oil flow past the bearing to cool the crank and rod. This can be from tight rod bearings, misaligned rod caps, out of round big ends, or simply not enough flow thru the oiling system for many other reasons.
    When this type of failure occurs the rods are blued on the big end and usually end up spinning a bearing as a result.

    When the rod it self is overloaded in tension the big ends can go oval which can pinch the bearings in and create heat and spin a bearing. Or the beam can simply snap off, or more commonly the bolts strength can be exceeded and the rod caps can walk or even pull away from the rod. When this happens the bearing crush is lost and it comes loose and will likely spin or the bolts will just snap off.

    The tension on the rod is highest at TDC during valve overlap not at TDC when firing the cylinder. This is because of the pressure on top of the piston at TDC during firing. This is also when the piston is most likely to contact the head.

    This tension load on the rod and bolts is determined by the stroke, the length of the rod and the weight of the piston, pin, and small end of the rod and also most importantly the rpm of the engine.
    The g loading on the rod gets crazy at high rpms. As the rpms rise so does the g loading in tension on the rod and bolts.

    So, on a stroker engine where the stroke is longer the rod is under more tension at the same rpm vs a stock stroke engine. Or if you rev the engine another, lets just say, 1000 rpms the load is higher.
    A stock rod and bolts are designed to handle stock stroke and stock rpms and as long as the rods get proper oil supply they work fine, but increase either the stroke and or the rpms and you may need stronger bolts or rods or both.

    When we run our 5mm stroker engines up to 12,200 rpms with peak power at 11,800 rpms you better believe we need and use better rods and bolts.

    This is exactly why turbo motors can make 400-500 hp on stock rods. The rods and bolts are not under any more tensional load than a stock engine as long as you don't over rev the engine.


    CompetitionCNC.com
    98 Falls Ave.
    Oakville, Ct. 06779
    860-274-0631

  9. #8
    Senior Member

    Join Date
    Dec 2008
    Posts
    1,434
    Post Thanks / Like
    Rep Power
    7

    Default

    Great post Jim!!!

Similar Threads

  1. 01 zx12 rod knocking
    By Fish in forum Kawasaki ZX12R-ZX14
    Replies: 7
    Last Post: 08-27-2011, 05:37 PM
  2. ZX12 stock rod max hp limit?
    By Thunder206 in forum StreetBike-DragBike
    Replies: 2
    Last Post: 08-26-2011, 09:59 PM
  3. 2000 zx12 how much HP
    By cabrazx12 in forum Kawasaki ZX12R-ZX14
    Replies: 18
    Last Post: 01-11-2011, 10:02 PM
  4. 2000 zx12 redo
    By 2000zx12 in forum Kawasaki ZX12R-ZX14
    Replies: 8
    Last Post: 12-29-2009, 08:58 PM
  5. stock cylinders for 2000 zx12
    By johnbusa06 in forum Wanted Items
    Replies: 2
    Last Post: 06-01-2009, 11:59 AM

Posting Permissions

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

Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.