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engine_details:engine_internals [2020/04/13 15:14] – ben | engine_details:engine_internals [2020/04/13 15:36] (current) – ben | ||
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==== Series 2 vs Series 3 ==== | ==== Series 2 vs Series 3 ==== | ||
- | Series 3 engines all utilized | + | 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/ | ||
+ | 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 " | ||
+ | " | ||
+ | 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. | ||
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+ | ==== ==== | ||
===== Pistons ===== | ===== Pistons ===== | ||
- | =====\\ | + | L67 and L32 pistons (supercharged) are longer than L36/ |
- | 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:// | + | |
- | Stroking/Boring options | + | [[http:// |