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engine_details:engine_internals [2020/03/26 03:41] – created benengine_details:engine_internals [2020/04/13 15:36] (current) ben
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-**This page is just a skeleton for now**+====== Internal Details ======
  
-L36 vs L67 vs L32 vs L26\\ +Basic Details 
- - connecting rods\\ + 
-https://www.3800pro.com/threads/l67-vs-l36-connecting-rod-differences.26632/ \\ +Since we know that the engine blocks between all of the series 2 and series 3 3800's are largely identical we can forget about that and focus on the internal components where a lot of the differences lie. 
- - pistons\\ + 
- - flywheels\\+===== Valvetrain ===== 
 + 
 +[[:engine_details:cams_and_timing|Camshafts and Cam Timing]] 
 + 
 +[[:engine_details:rockers|Rockers]] 
 + 
 +===== Connecting Rods ===== 
 + 
 +[[https://www.3800pro.com/threads/l67-vs-l36-connecting-rod-differences.26632/|https://www.3800pro.com/threads/l67-vs-l36-connecting-rod-differences.26632/]] 
 + 
 +==== Series 2 vs Series 3 ==== 
 + 
 +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 ==== 
 + 
 +The L67 and L32 have stronger connecting rods than the the L36 and L26 engines. 
 + 
 +L36/L26 rods are longer than L67/L32 rods as well\\ 
 +{{:engine_details:192e053e7c254614eac39a8a53c24fbf.png}} 
 + 
 +Below is an image of the L67 and L36 connecting rods: 
 + 
 +{{:engine_details:94ccf577aaab050d0c05fbe7e1d533d5.png}} 
 + 
 +The L67 rod is on the left and the L36 rod is on the right. 
 + 
 +==== L36(s2 NA) vs L26(s3 NA) Connecting Rods ==== 
 + 
 +Below is an image of the L36 and L26 connecting rods. 
 + 
 +{{https://i58.photobucket.com/albums/g272/destinedtofail13/Firebird/IMAG0798.jpg?nolink&|imag0798.jpg}} 
 + 
 +The L26 rod is powdered metal, however it is slightly smaller than the L36 connecting rod. 
 + 
 +Here is a side profile of the two: 
 + 
 +{{https://i58.photobucket.com/albums/g272/destinedtofail13/Firebird/IMAG0803.jpg?nolink&|imag0803.jpg}} 
 + 
 +The L26 rod is on the right, the L36 is on the left. 
 + 
 +====   ==== 
 + 
 +===== Pistons ===== 
 + 
 +L67 and L32 pistons (supercharged) are longer than L36/L26(Naturally-aspirated) pistons. 
 + 
 +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 
 + 
 +===== Resources: ===== 
 + 
 +[[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]]
  
-journal sizes\\ 
-https://www.3800pro.com/threads/l36-and-l67-journal-size.48314/ \\ 
  
-Stroking/Boring options\\