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engine_details:engine_internals [2020/04/13 15:14] – benengine_details:engine_internals [2020/04/13 15:34] – ben
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 ==== Series 2 vs Series 3 ==== ==== Series 2 vs Series 3 ====
  
-Series 3 engines all utilized sinter forged powdered metal connecting rods, however the series 2 rods were cast metal. There is some debate as to which material is stronger though.+Series 3 engines all utilized powdered metal connecting rods, however the series 2 rods were cast metal. There is some debate as to which material is stronger though. 
 + 
 +The series 3 powdered metal rods dont have the weight variance that cast do, save time/material for balancing.\\ 
 +powdered metal rods are brittle so they can machine the big end bore and bolt holes then crack the cap off (no more machining 2 separate components to mate then final machine big end)\\ 
 +the fractured cap also means the cap is self aligning, this is a good thing but the material being brittle to accomplish this means the material may not be very strong and will shatter instead of bend at their limit. 
 + 
 +Some will reference the series 3 rods as being stronger because they are "forged" rods. However the forging process that was used to create these rods is not a conventional forging process.\\ 
 +"forged" in their terminology is that the powdered metal is pressed/forged into shape then the pressing is heated to fuse the metal particles.\\ 
 +It is not a forging in the conventional sense where a hot ingot is hot forged into the shape of a rod over multiple dies thereby giving the steel a grain structure that improves the metals strength...that is a true rod forging.
  
 ==== L67 vs L36 ==== ==== L67 vs L36 ====
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 The L26 rod is on the right, the L36 is on the left. The L26 rod is on the right, the L36 is on the left.
 +
 +==== L67 vs L32 Connecting Rods ====
  
 ===== Pistons ===== ===== Pistons =====
  
-=====\\ +L67 and L32 pistons (supercharged) are longer than L36/L26(Naturally-aspirated) pistons. 
-Journals+ 
 +The supercharged pistons have a thicker crown and a a deeper dish. The ring lands are also moved down by 0.1" compared to the naturally aspirated engines.
  
-=====   =====+Some L67 and L32 pistons received piston skirt coatings starting in 2003. This coating though seems to wear off by ~75,000 miles
  
-journal sizes\\ +===== Resources: =====
-[[https://www.3800pro.com/threads/l36-and-l67-journal-size.48314/|https://www.3800pro.com/threads/l36-and-l67-journal-size.48314/]]+
  
-Stroking/Boring options+[[http://www.grandprixforums.com/3-8l-v6-supercharged-l67-l32-/83989-l67-vs-l32-l26-rods-pistons.html|http://www.grandprixforums.com/3-8l-v6-supercharged-l67-l32-/83989-l67-vs-l32-l26-rods-pistons.html]]