Differences

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--- engine_details:engine_internals [2020/04/13 15:10] – ben
+++ engine_details:engine_internals [2020/04/13 15:36] (current) – ben
@@ Line 17: / Line 17: @@
 ==== 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 ====
 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:
@@ Line 42: / Line 53: @@
 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.
-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]]