Re: [vintagvw] Rocker arm geometry

'Rudolph Dehoogh' via VintagVW - Air Cooled Volkswagen Discussion List Wed, 27 May 2015 08:47:00 -0700




 
<<<Dean,  do live any where near NYC?  I would be happy to help>>>


Daniel, 


I live in Shirley Long Island. I'm in need of a bug mechanic.
Know anybody?


Rudy  LI  NY    
 
  
 
 


  
  
   
  
  
   
  
  
   
  
 
 
  
On May 26, 2015, at 9:36 PM, Dean Johnson <  [email protected]> wrote: 
 
  
 
 
  
   
I read the How to hot rod instructions and couldn't make sense of them
 'Adjust the push rod so that it fits...' Not helpful and I don't have any idea 
what centerlines they're talking about and what does it mean for two lines to 
'coincide'? Not at all helpful.
    
Still looking for instructions with visuals.
 
    
On May 25, 2015 9:29 PM, "Dave C. Bolen" <    [email protected]> wrote: 
   
    
Guys,     
      
 Your good old copy of "How to hot rod vw's" has excellent instructions on 
this.     
      
 Although...if you have stock rocker arms and stock pushrods they really should 
be close.  Oh, stroked engine?     
      
 Cheers, dave     
      
 On Mon, 25 May 2015, Daniel Moy wrote:     
      
      
 When I did mine I made an adjustable push rod out of a stock rod.  Basically 
cut one in half, trim down then cut some threads      
 and insert threaded rod with two locking nuts.        
       
 Install the head torqued to spec.  Do not install the push rods or push rod 
tubes.      
       
 Install your adjustable push rod and your rockers with some spacers to account 
for the swivel feet and lash caps (these are a      
 good idea as the provide a larger surface area for the swivel feet), check the 
geometry,  there should be no binding when      
 cycling the engine.  If there is binding make the push rod shorter.      
       
 Check the adjusted rod in a few locations particularly the other side of the 
engine.      
       
 If all is well then you now have a properly sized push rod, now you need to 
make eight solid push rods.  I purchased mine from      
 gene berg back in the day.  Chrome moly, cut them to length and pushed in the 
ends.      
       
 It's been a while but I believe those are the steps.      
       
       
       
       
       
 On May 25, 2015, at 8:39 PM, Dean Johnson <      [email protected]> 
wrote:      
       
       I re-read the info from the machine shop. He thinks the original engine 
builder, Strictly Foreign, didn't set up the      
       push rod length at all and that I need to do this. That makes sense as 
they are way off. So who has a good      
       description of measuring proper pushrod length?      
       BTW. RISMachine did the head work.      
       
       On May 26, 2015 4:13 AM, "Dean Johnson" <      
[email protected]> wrote:      
       
             No, stock rockers.      
       
             On May 25, 2015 5:32 PM, "Daniel Moy" <      [email protected]> 
wrote:      
                   Hi Dean,      
       
 Did you have ratio rocker arms, if so did you size the push rods?      
       
 Dan      
       
       
       
       
       
 On May 25, 2015, at 5:21 PM, Dean Johnson <      [email protected]> 
wrote:      
       
       I am finally installing my rebuilt heads into my 1915 cc engine. I have 
the heads on, put in the      
       push rods and am test fitting the rocker arms to check geometry.I put 
the shims that had been      
       installed under the shafts originally and there is not nearly enough 
room for the swivel foot      
       adjusters. Even screwed all the way out, they nearly touch the stems. If 
I use a thicker shim I am      
       afraid I won't have enough threads for the rocker arm nuts. ( can I back 
the studs out?) will      
       standard adjusters give me more adjustment? Where is the best graphical 
description of adjusting      
       the geometry? I don't have a dial indicator so if there is another way 
to do it, that'd be great.      
 Dean      
 '71 Super Beetle      
       http://deangj.tumblr.com      
       
       
       
 --      
 Dean G. Johnson, PhD      
 Postdoctoral Fellow      
 Biomedical Engineering      
 McGrath Lab      
 University of Rochester      
 Robert B. Goergen Hall Rm. 316      
 Box 270168      
 Rochester, NY 14627      
       [email protected]      
 Office:       585-273-2156      
 Mobile:       315-576-5928      
       
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Re: [vintagvw] Rocker arm geometry

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