Hi,  Are the Rino adjusting screws like the style Porsche uses with the flat swivel on a ball on the end of the adjusting screw  or are they like the  Courrier style that has a ball with a flat on it inside a little housing on the adjuster screw.
    
      Another thing I was wondering is how do the roller rockers hold up after 1000's of miles. The stock adjusters are designed to push on the valve stem off center to make the valve rotate so the valve seal stays good. Do the rollers do make the valves spin?
    
    
    
    Larry, 
    
    Here is a copy of the post I made earlier.   
    Stock rockers are 1.1.  What the ratio means is that for every X amount of 
    cam lift, the valve opens further by 1.1/1.25/1.3/1.4 inches. Using ratio 
    rockers is a way for the valve to be opened further than the actual cam lift 
    to keep the wear on the cam and lifters minimized.  The cam does not have to 
    go to extreme angles against the lifter to achieve the same total lift. 
    
    The ratio is achieved by moving the center pivot line further to one side. 
     The longer one side is the greater the ratio. 
    
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    --0----- 
    -0------ 
    
    One other plus for using ratio rockers is that the arc that the adjusting 
    screw takes is reduced and that reduces the side load on the valve stem, 
    increasing the valve guide life.  When you use swivel adjusting screws or 
    roller tip rockers the side load on the valve stem is further reduced, 
    further increasing the valve guide life. 
    
    Boston Bob states that the 2.1L tends to eat guides, by simply utilizing 
    swivel adjusting screws on stock  1.1 ratio rockers (You will have to use 
    aftermarket Rhino 1.1 ratio rockers with a 9 mm adjusting screw) you can 
    dramatically increase the valve guide life. 
    
    **attached is a picture that shows the rocker arm shaft off center compared 
    to a stock (1.3 ratio) 
    
    ________________________________________________ 
    
    
    <<<The ratio rockers in on these dyno reports are 1.4. The Pawter rockersare 
    1.3, and I believe the original rockers that Robert Lilly had usedwere 1.25, 
    and then switched to 1.3. which I guess you have.>>> 
        
    I have a modified cam that has an increased lift from stock.  I choose the 
    1.25 and 1.3 because the total lift is more than the 1.4 rockers on the stock 
    cam. 
    
    
    I used the 1.25 at first.  These were the VW Rhino 1.25 with the 9 mm 
    adjusting screw.  I used the Rhino swivel adjusting screws.  They have the 
    entire head that swivels to reduce valve stem side load.  Used with solid 
    rocker shafts, they are an inexpensive upgrade and are mild. 
    
    I then switch to the Pauter 1.3 roller tip rockers.  I wanted the roller tip 
    to further reduce stem side loading (even though the arc is reduced the Berg 
    rockers DO NOT reduce the stem side load as much because they still slide on 
    the valve tip during the lifting motion) The 1.25 were discontinued from 
    Pauter that is why I went to the 1.3. 
    
    
    IF you DO NOT change the cam use either the 1.3 or 1.4.  IF you ever plan to 
    change the cam use the 1.3 to avoid changing in the future otherwise use of 
    the 1.4 is fine. 
    
    
    
    stock cam          I: .330  with 1.3: 0.429   with 1.4: .462 
                            E: .317 with 1.3  0.412  with 1.4: .444 
    
    
    #91 WebCam      I:  .363   with 1.3: .472   with the 1.4:  0.508 
                            E: .363   with 1.3: .472   with the 1.4:  0.508 
    
    Looking at the above chart, the use of the WebCam cam AND the 1.3 ratio 
    rockers, you get a greater lift than with the stock cam and the 1.4 ratio. 
    
    
    I chose ratio rockers because they offer increased air flow, maintain air 
    speed through the intake ports at lower speeds and improve the bottom end 
    because the valves are opening faster than stock valves and accelerate the 
    air flow. 
    
    
    Another key is, with the WebCam, the exhaust is open greater and longer 
    allowing for more exhaust to exit along with the increased duration to get 
    the fuel mixture into the cylinder sooner from increased exhaust scavenging 
    to give each charge more power.  Added to the cam benefit is the coatings 
    that keep the exhaust hotter as it exits to keep a higher exhaust gas speed 
    that increases scavenging. This is why, in my set up, the stock exhaust pipes 
    work better.  Plus the stock pipes are patterned after 914 race exhausts...4 
    to 2 to 1. 
    
    Rockers increase airflow without expensive port work.  Sometimes with 
    porting, you lose low power because the air flow decreases in larger ports 
    due to reduced air speed (physics) the way to overcome this is a higher rpm 
    to pick the speed up.  The length of the total intake also affects air speed. 
    
    Ratio rockers do not decrease low end power but increase it.  The valves are 
    opening sooner, opening further and held open longer but air speed is 
    maintained because the port size has not changed, thus allowing for more 
    air/fuel to enter the chamber, producing more power.  The effect will be 
    enhanced when you also modify other systems to flow more air.  Better 
    muffler, air filter, match porting, cleaning up ports of restrictions.  All 
    small changes add up to a big change overall. 
    
    
    If you put on rockers add exhaust wrap to keep the exhaust gasses hot to pull 
    more from the intake into the cylinders, change the air filter, change to 
    triple or quad plugs to burn the gasses better to get more power, then you 
    will need to use less pedal to get to the same speed and use less gas because 
    you are getting more power from the same amount of fuel.  When you make 
    changes to one area, see how it changes other areas to keep it balanced... 
    
    Robert 

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