Pistons and rings
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===Diagram=== | ===Diagram=== | ||
| − | [[File:Piston parts | + | [[File:1000px-Piston parts diagram33.gif|border|center]] |
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| − | |- | + | |+'''Diagram Key''' |
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! 1 to 10!! 11 to 20 !! 21 to 30 | ! 1 to 10!! 11 to 20 !! 21 to 30 | ||
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|1. Compression Height ||11. Pin Oiler ||21. Skirt Thickness | |1. Compression Height ||11. Pin Oiler ||21. Skirt Thickness | ||
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| − | |2. Crown | + | |2. Crown ||12. Pin Span ||22. SS |
|- | |- | ||
|3. Deck ||13. Pin Tower ||23. Support Band | |3. Deck ||13. Pin Tower ||23. Support Band | ||
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|9. Oil Return ||19. Side Relief ||29. VR Diameter | |9. Oil Return ||19. Side Relief ||29. VR Diameter | ||
|- | |- | ||
| − | |10. Pin Bore||20. Skirt ||30. VR | + | |10. Pin Bore||20. Skirt ||30. VR C/L |
|} | |} | ||
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==Piston designs== | ==Piston designs== | ||
Cast pistons are fine for engines that won't see nitrous or boost. Forged pistons are a better choice if the engine will see boost or nitrous due to the added durability. There are those who say using cast pistons and nitrous/boost is acceptable. And it is- providing the tune is spot on and the engine never sees detonation. If it does, the cast pistons will be the first thing to fail, and when they go they usually damage the bore and possibly the cylinder head as well. This is because cast and hypereutectic aluminum alloys are brittle and when they fail they tend to shatter into many pieces, where a forging will generally stay in one piece, with pinched ring lands or depressed crowns, etc. | Cast pistons are fine for engines that won't see nitrous or boost. Forged pistons are a better choice if the engine will see boost or nitrous due to the added durability. There are those who say using cast pistons and nitrous/boost is acceptable. And it is- providing the tune is spot on and the engine never sees detonation. If it does, the cast pistons will be the first thing to fail, and when they go they usually damage the bore and possibly the cylinder head as well. This is because cast and hypereutectic aluminum alloys are brittle and when they fail they tend to shatter into many pieces, where a forging will generally stay in one piece, with pinched ring lands or depressed crowns, etc. | ||
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